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0 0 1-.052-1.086c0-1.331.282-2.499 1.132-3.368.397-.406.89-.717 1.474-.952 1.399-1.136 3.392-2.093 6.122-2.093 2.731 0 4.767.957 6.166 2.093.584.235 1.077.546 1.474.952.85.869 1.132 2.037 1.132 3.368 0 .368-.014.733-.052 1.086.23.462.477 1.088.644 1.517 1.258.364 2.233 1.721 2.605 2.656a.832.832 0 0 1 .053.22v2.869a.641.641 0 0 1-.078.256ZM12.172 11h-.344a4.323 4.323 0 0 1-.355.508C10.703 12.455 9.555 13 7.965 13c-1.725 0-2.989-.359-3.782-1.259a2.005 2.005 0 0 1-.085-.104L4 11.741v6.585c1.435.779 4.514 2.179 8 2.179 3.486 0 6.565-1.4 8-2.179v-6.585l-.098-.104s-.033.045-.085.104c-.793.9-2.057 1.259-3.782 1.259-1.59 0-2.738-.545-3.508-1.492a4.323 4.323 0 0 1-.355-.508h-.016.016Zm.641-2.935c.136 1.057.403 1.913.878 2.497.442.544 1.134.938 2.344.938 1.573 0 2.292-.337 2.657-.751.384-.435.558-1.15.558-2.361 0-1.14-.243-1.847-.705-2.319-.477-.488-1.319-.862-2.824-1.025-1.487-.161-2.192.138-2.533.529-.269.307-.437.808-.438 1.578v.021c0 .265.021.562.063.893Zm-1.626 0c.042-.331.063-.628.063-.894v-.02c-.001-.77-.169-1.271-.438-1.578-.341-.391-1.046-.69-2.533-.529-1.505.163-2.347.537-2.824 1.025-.462.472-.705 1.179-.705 2.319 0 1.211.175 1.926.558 2.361.365.414 1.084.751 2.657.751 1.21 0 1.902-.394 2.344-.938.475-.584.742-1.44.878-2.497Z"></path><path d="M14.5 14.25a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Zm-5 0a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Z"></path> </svg> <div> <div class="color-fg-default h4">GitHub Copilot</div> Write better code with AI </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"security","context":"product","tag":"link","label":"security_link_product_navbar"}" href="https://github.com/features/security"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon 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0 0 1 2 12.25v-8.5C2 2.784 2.784 2 3.75 2Zm6.854-1h4.146a.25.25 0 0 1 .25.25v4.146a.25.25 0 0 1-.427.177L13.03 4.03 9.28 7.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.75-3.75-1.543-1.543A.25.25 0 0 1 10.604 1Z"></path> </svg> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary Link--external" target="_blank" data-analytics-event="{"location":"navbar","action":"github_skills","context":"product","tag":"link","label":"github_skills_link_product_navbar"}" href="https://skills.github.com"> GitHub Skills <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-link-external HeaderMenu-external-icon color-fg-subtle"> <path d="M3.75 2h3.5a.75.75 0 0 1 0 1.5h-3.5a.25.25 0 0 0-.25.25v8.5c0 .138.112.25.25.25h8.5a.25.25 0 0 0 .25-.25v-3.5a.75.75 0 0 1 1.5 0v3.5A1.75 1.75 0 0 1 12.25 14h-8.5A1.75 1.75 0 0 1 2 12.25v-8.5C2 2.784 2.784 2 3.75 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7.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.75-3.75-1.543-1.543A.25.25 0 0 1 10.604 1Z"></path> </svg> </a></li> </ul> </div> </div> </div> </li> <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Solutions <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 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height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4 px-lg-4"> <div class="HeaderMenu-column"> <div class="border-bottom pb-3 pb-lg-0 pb-lg-3 mb-3 mb-lg-0 mb-lg-3"> <ul class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" data-analytics-event="{"location":"navbar","action":"github_sponsors","context":"open_source","tag":"link","label":"github_sponsors_link_open_source_navbar"}" href="/sponsors"> <div> <div class="color-fg-default h4">GitHub Sponsors</div> 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js-details-container js-header-menu-item"> <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false"> Enterprise <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1"> <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path> </svg> </button> <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4 px-lg-4"> <div class="HeaderMenu-column"> <div class="border-bottom pb-3 pb-lg-0 pb-lg-3 mb-3 mb-lg-0 mb-lg-3"> <ul class="list-style-none f5" > <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary 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8.351a1.312 1.312 0 0 1-1.146 1.954H1.33A1.313 1.313 0 0 1 .183 9.058ZM7 7V3H5v4Zm-1 3a1 1 0 1 0 0-2 1 1 0 0 0 0 2Z"></path> </svg> </span> <span></span> </div> </div> <div data-target="query-builder.screenReaderFeedback" aria-live="polite" aria-atomic="true" class="sr-only"></div> </query-builder></form> <div class="d-flex flex-row color-fg-muted px-3 text-small color-bg-default search-feedback-prompt"> <a target="_blank" href="https://docs.github.com/search-github/github-code-search/understanding-github-code-search-syntax" data-view-component="true" class="Link color-fg-accent text-normal ml-2">Search syntax tips</a> <div class="d-flex flex-1"></div> </div> </div> </div> </div> </modal-dialog></div> </div> <div data-action="click:qbsearch-input#retract" class="dark-backdrop position-fixed" hidden data-target="qbsearch-input.darkBackdrop"></div> <div class="color-fg-default"> <dialog-helper> <dialog data-target="qbsearch-input.feedbackDialog" data-action="close:qbsearch-input#handleDialogClose cancel:qbsearch-input#handleDialogClose" id="feedback-dialog" aria-modal="true" aria-labelledby="feedback-dialog-title" aria-describedby="feedback-dialog-description" data-view-component="true" class="Overlay Overlay-whenNarrow Overlay--size-medium Overlay--motion-scaleFade Overlay--disableScroll"> <div data-view-component="true" class="Overlay-header"> <div class="Overlay-headerContentWrap"> <div class="Overlay-titleWrap"> <h1 class="Overlay-title " id="feedback-dialog-title"> Provide feedback </h1> </div> <div class="Overlay-actionWrap"> <button data-close-dialog-id="feedback-dialog" aria-label="Close" type="button" data-view-component="true" class="close-button Overlay-closeButton"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x"> <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path> </svg></button> </div> </div> </div> <scrollable-region data-labelled-by="feedback-dialog-title"> <div data-view-component="true" class="Overlay-body"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form id="code-search-feedback-form" data-turbo="false" action="/search/feedback" accept-charset="UTF-8" method="post"><input type="hidden" data-csrf="true" name="authenticity_token" value="9VUj9UdReuZlvtG2JVwS1VYGkRLd5HATMm2bLUdxtZZEBOw71zw9CqjvphwLF+ze+kqjV+ODuin55y9FjhG5aA==" /> <p>We read every piece of feedback, and take your input very seriously.</p> <textarea name="feedback" class="form-control width-full mb-2" style="height: 120px" id="feedback"></textarea> <input name="include_email" id="include_email" aria-label="Include my email address so I can be contacted" class="form-control mr-2" type="checkbox"> 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Overlay--size-medium Overlay--motion-scaleFade Overlay--disableScroll"> <div data-view-component="true" class="Overlay-header Overlay-header--divided"> <div class="Overlay-headerContentWrap"> <div class="Overlay-titleWrap"> <h1 class="Overlay-title " id="custom-scopes-dialog-title"> Saved searches </h1> <h2 id="custom-scopes-dialog-description" class="Overlay-description">Use saved searches to filter your results more quickly</h2> </div> <div class="Overlay-actionWrap"> <button data-close-dialog-id="custom-scopes-dialog" aria-label="Close" type="button" data-view-component="true" class="close-button Overlay-closeButton"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x"> <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path> </svg></button> </div> </div> </div> <scrollable-region data-labelled-by="custom-scopes-dialog-title"> <div data-view-component="true" class="Overlay-body"> <div data-target="custom-scopes.customScopesModalDialogFlash"></div> <div hidden class="create-custom-scope-form" data-target="custom-scopes.createCustomScopeForm"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form id="custom-scopes-dialog-form" data-turbo="false" action="/search/custom_scopes" accept-charset="UTF-8" method="post"><input type="hidden" data-csrf="true" name="authenticity_token" value="U5HiH9vcntqljZOV0lUZmwG0d8y6Q+THYIglf9o34k/pYnwBEiY6IWYPfa0ENJx+i7n+saJOVQQQ9IoHxvHKUg==" /> <div data-target="custom-scopes.customScopesModalDialogFlash"></div> <input type="hidden" id="custom_scope_id" name="custom_scope_id" data-target="custom-scopes.customScopesIdField"> <div class="form-group"> <label for="custom_scope_name">Name</label> <auto-check src="/search/custom_scopes/check_name" required only-validate-on-blur="false"> <input type="text" name="custom_scope_name" id="custom_scope_name" data-target="custom-scopes.customScopesNameField" class="form-control" autocomplete="off" placeholder="github-ruby" required maxlength="50"> <input type="hidden" data-csrf="true" value="Zcu0dwqXo8KK65e1vfMGclsVu10JhLygH5VeRRaM3FfUQfcJZHfGHIsjOXWgHxETnFpMinff6JE1oRDPouC24A==" /> </auto-check> </div> <div class="form-group"> <label for="custom_scope_query">Query</label> <input type="text" name="custom_scope_query" id="custom_scope_query" data-target="custom-scopes.customScopesQueryField" class="form-control" autocomplete="off" placeholder="(repo:mona/a OR repo:mona/b) AND lang:python" required maxlength="500"> </div> <p class="text-small color-fg-muted"> To see all available qualifiers, see our <a class="Link--inTextBlock" href="https://docs.github.com/search-github/github-code-search/understanding-github-code-search-syntax">documentation</a>. </p> </form> </div> <div data-target="custom-scopes.manageCustomScopesForm"> <div data-target="custom-scopes.list"></div> </div> </div> </scrollable-region> <div data-view-component="true" class="Overlay-footer Overlay-footer--alignEnd Overlay-footer--divided"> <button data-action="click:custom-scopes#customScopesCancel" type="button" data-view-component="true" class="btn"> Cancel </button> <button form="custom-scopes-dialog-form" data-action="click:custom-scopes#customScopesSubmit" data-target="custom-scopes.customScopesSubmitButton" type="submit" data-view-component="true" class="btn-primary btn"> Create saved search </button> </div> </dialog></dialog-helper> </custom-scopes> </div> </qbsearch-input> <div class="position-relative HeaderMenu-link-wrap d-lg-inline-block"> <a href="/login?return_to=https%3A%2F%2Fgithub.com%2Feeeps%2Fclient-hints-infrastructure" class="HeaderMenu-link HeaderMenu-link--sign-in HeaderMenu-button flex-shrink-0 no-underline d-none d-lg-inline-flex border border-lg-0 rounded rounded-lg-0 px-2 py-1" style="margin-left: 12px;" data-hydro-click="{"event_type":"authentication.click","payload":{"location_in_page":"site header menu","repository_id":null,"auth_type":"SIGN_UP","originating_url":"https://github.com/eeeps/client-hints-infrastructure","user_id":null}}" data-hydro-click-hmac="ae406b2baa6aa795e7d5c78190be291de716addb1daff3b96c80aaa689919ab8" data-analytics-event="{"category":"Marketing nav","action":"click to go to homepage","label":"ref_page:Marketing;ref_cta:Sign in;ref_loc:Header"}" > Sign in </a> </div> <a href="/signup?ref_cta=Sign+up&ref_loc=header+logged+out&ref_page=%2F%3Cuser-name%3E%2F%3Crepo-name%3E&source=header-repo&source_repo=eeeps%2Fclient-hints-infrastructure" class="HeaderMenu-link HeaderMenu-link--sign-up HeaderMenu-button flex-shrink-0 d-flex d-lg-inline-flex no-underline border color-border-default rounded px-2 py-1" data-hydro-click="{"event_type":"authentication.click","payload":{"location_in_page":"site header menu","repository_id":null,"auth_type":"SIGN_UP","originating_url":"https://github.com/eeeps/client-hints-infrastructure","user_id":null}}" data-hydro-click-hmac="ae406b2baa6aa795e7d5c78190be291de716addb1daff3b96c80aaa689919ab8" data-analytics-event="{"category":"Sign up","action":"click to sign up for account","label":"ref_page:/<user-name>/<repo-name>;ref_cta:Sign up;ref_loc:header logged out"}" > Sign up </a> <button type="button" class="sr-only js-header-menu-focus-trap d-block d-lg-none">Reseting focus</button> </div> </div> </div> </div> </header> <div hidden="hidden" data-view-component="true" class="js-stale-session-flash stale-session-flash flash flash-warn flash-full"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-alert"> <path d="M6.457 1.047c.659-1.234 2.427-1.234 3.086 0l6.082 11.378A1.75 1.75 0 0 1 14.082 15H1.918a1.75 1.75 0 0 1-1.543-2.575Zm1.763.707a.25.25 0 0 0-.44 0L1.698 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class=\"heading-element\" dir=\"auto\"\u003eExplainer\u003c/h1\u003e\u003ca id=\"user-content-explainer\" class=\"anchor\" aria-label=\"Permalink: Explainer\" href=\"#explainer\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eClient Hints is collection of HTTP and user-agent features that enables\nprivacy-preserving, proactive content negotiation with an explicit third-party\ndelegation mechanism:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eProactive content negotiation at the HTTP layer (defined in the\n\u003ca href=\"https://tools.ietf.org/html/rfc8942\" rel=\"nofollow\"\u003eIETF RFC\u003c/a\u003e)\nenables servers to request delivery of specific hints, in order to enable\noptimized and automated selection of resources based on a user's device,\nconditions and preferences, and lets clients decide which hint requests they\nwant to grant, with per-hint and per-origin granularity.\u003c/li\u003e\n\u003cli\u003eIntegration of said mechanism with web concepts (defined in this\n\u003ca href=\"https://wicg.github.io/client-hints-infrastructure\" rel=\"nofollow\"\u003especification\u003c/a\u003e)\nspecification) enables browsers to benefit from content adaptation, and have it\nplay nicely with current web restrictions (e.g. same-origin policy).\u003c/li\u003e\n\u003cli\u003eThe opt-in nature of the mechanism enables browsers to advertise requested\nhint data (e.g. user agent and device characteristics) selectively to\nsecure-transport origins, instead of appending such data on every outgoing\nrequest.\u003c/li\u003e\n\u003cli\u003eOrigin opt-in applies to same-origin assets only and delivery to third-party\norigins is subject to explicit first party delegation via Feature Policy,\nenabling tight control over which third party origins can access requested\nhint data.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eThe goal of Client Hints is to \u003cstrong\u003ereduce passive fingerprinting\u003c/strong\u003e on the web\nwhile \u003cstrong\u003eenabling scalable and privacy preserving content adaptation\u003c/strong\u003e between\nclient and server, via a standardized set of content negotiation primitives at\nthe HTTP and user agent levels.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis document outlines the Client Hints infrastructure, explains it at a high\nlevel and points to the various specification and draft proposals in which it\nis officially defined. It does not describe the various features and hints\nwhich rely on this infrastructure. They will be defined in their respective\nspecifications.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eThe Client Hints infrastructure\u003c/h1\u003e\u003ca id=\"user-content-the-client-hints-infrastructure\" class=\"anchor\" aria-label=\"Permalink: The Client Hints infrastructure\" href=\"#the-client-hints-infrastructure\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eHow can servers opt into receiving hints from the client? How should clients\nsend those hints? And how should that be handled across origins?\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eOpt-in mechanism\u003c/h2\u003e\u003ca id=\"user-content-opt-in-mechanism\" class=\"anchor\" aria-label=\"Permalink: Opt-in mechanism\" href=\"#opt-in-mechanism\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIn order to receive Client Hints, servers must opt-in by using the HTTP\nresponse headers described in the sections below. For security and privacy\nreasons, the opt-in must be received on the response of the top-level\nnavigation, over a secure connection.\nServers can similarly opt-in by using the headers' HTML equivalents, the\n\u003ccode\u003e\u0026lt;meta\u0026gt;\u003c/code\u003e HTML tag and its \u003ccode\u003ehttp-equiv\u003c/code\u003e attribute.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ccode\u003eAccept-CH\u003c/code\u003e\u003c/h3\u003e\u003ca id=\"user-content-accept-ch\" class=\"anchor\" aria-label=\"Permalink: Accept-CH\" href=\"#accept-ch\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003eAccept-CH\u003c/code\u003e header enables servers to request specific hints from the\nbrowser. The header's value is a comma separated list, where each value in that\nlist represents a request header hint that the server is interested in\nreceiving.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWhen an \u003ccode\u003eAccept-CH\u003c/code\u003e opt-in is received on the top-level navigation, same-origin\nsubresource requests on that page will receive the requested hints, unless the\nclient has reasons to avoid sending that information to the server.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eExample\u003c/h4\u003e\u003ca id=\"user-content-example\" class=\"anchor\" aria-label=\"Permalink: Example\" href=\"#example\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIf a server's response to a navigation request includes the \u003ccode\u003eAccept-CH: foo, bar\u003c/code\u003e header, same-origin subresource requests on the page will include the\n\u003ccode\u003eSec-Foo: foo-value\u003c/code\u003e and \u003ccode\u003eSec-Bar: bar-value\u003c/code\u003e request headers.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSame-Origin Policy\u003c/h2\u003e\u003ca id=\"user-content-same-origin-policy\" class=\"anchor\" aria-label=\"Permalink: Same-Origin Policy\" href=\"#same-origin-policy\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThere are two important restrictions on the opt-in mechanism description above:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eopt-ins will only be granted when the opt-in headers are received with a\ntop-level navigation resource\u003c/li\u003e\n\u003cli\u003eafter the opt-in, hints will only be sent with same-origin requests\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eWhy are these limitations important?\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAs mentioned before, we don't want the mechanism to be used to increase\nfingerprinting on the web. The information that Client Hints provide should\ngenerally be available through Javascript APIs (see the\n\u003ca href=\"#privacy-considerations\"\u003ePrivacy Considerations\u003c/a\u003e section for more details).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThat means that for \u003cem\u003eactive\u003c/em\u003e resources (e.g. HTML), Client Hints does not\nincrease the active fingerprinting surface. Servers serving active resources\ncan already exfiltrate the data that hints provide, via scripts, styles or\ncertain elements (e.g. \u003ccode\u003e\u0026lt;img srcset\u0026gt;\u003c/code\u003e). Client Hints only provides servers\nwith a more convenient and performant way to get that information for\ncontent-negotiation purposes and ensures that authors and user agents have\nultimate control over which servers get what information.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eClient Hints also allow this information to be collected on \u003cem\u003epassive\u003c/em\u003e\nsub-resources (e.g. images). We don't want third parties to be able to\nexfiltrate data about the client/user without explicit permission from the\nfirst party. And we certainly don't want them to be able to exfiltrate it for\nthe entire third-party origin, beyond the lifetime of the current navigation.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTherefore, by default, Client Hints opt-in is only valid when delivered on\ntop-level navigation requests, and, by default, applies only to same-origin\nresources. Cross-origin requests must only receive hints when explicit\npermission is given by the first-party origin.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eCross-origin hint delegation\u003c/h2\u003e\u003ca id=\"user-content-cross-origin-hint-delegation\" class=\"anchor\" aria-label=\"Permalink: Cross-origin hint delegation\" href=\"#cross-origin-hint-delegation\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWhy do we need cross-origin Client Hints?\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAs the purpose of for client hints is to enable content negotiation at scale, and\nas many optimization services are offered over different origins than the main\npage's origin(e.g., CDNs, resource-specific hosting services, or dedicated,\nresource-specific, first-party sub-domains), cross-origin support is a vital\npart of Client Hints.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn order to support these use-cases, we have defined delegation of Client Hints\nto specific cross-origin hosts, using Feature Policy.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eServers can opt-in to such delegation by applying \u003ccode\u003ech-\u003c/code\u003e prefixed feature policies for\nthe desired hints.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eExample\u003c/h3\u003e\u003ca id=\"user-content-example-1\" class=\"anchor\" aria-label=\"Permalink: Example\" href=\"#example-1\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eA first-party server sending the following header \u003ccode\u003eFeature-Policy: ch-example foo.com bar.com; ch-example-2 foobar.org\u003c/code\u003e as part of a top-level navigation\nresponse will delegate the \u003ccode\u003eexample\u003c/code\u003e hint to the \"foo.com\" and \"bar.com\"\norigins and \u003ccode\u003eexample-2\u003c/code\u003e to the \"foobar.org\" origin. So, the client would know\nthat it had explicit permission from the first party to send these hints to\nthese third parties, so that these third parties could perform content\nadaptation based on them.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ePrivacy implications\u003c/h3\u003e\u003ca id=\"user-content-privacy-implications\" class=\"anchor\" aria-label=\"Permalink: Privacy implications\" href=\"#privacy-implications\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWhy is it privacy-safe for pages to delegate hints to certain third party\norigins?\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSince we're treating Client Hints as an active fingerprinting equivalent, we\nare comfortable with the information it exposes to first-party servers, as the same\ninformation is already freely available in the equivalent Javascript APIs.\nSimilarly, third party delegation is safe because first parties are already able to use\nother means (such as link decoration), to achieve the same information sharing\nwith third parties, in less convenient and performant ways.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn short, first parties already have the power to share information about the\nclient with third parties. Third party delegation of Client Hints provides a\ncleaner pathway for that sharing, and ensures that first parties, and\nultimately clients, are aware and in control of what is being shared with who.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003e\u003ccode\u003eSec-\u003c/code\u003e prefix\u003c/h2\u003e\u003ca id=\"user-content-sec--prefix\" class=\"anchor\" aria-label=\"Permalink: Sec- prefix\" href=\"#sec--prefix\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAdding new request headers increases the risk that legacy server systems\nalready use those values for a different purpose. Changing the request header\nvalues that such legacy systems receive may result in server bugs.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWhile that risk is significantly mitigated by the opt-in mechanisms of Client\nHints (as servers would be opting in to get Client Hints headers), we feel\nit is required to mitigate it even further. So, Client Hints request headers\nshould be preceded by the \u003ccode\u003eSec-\u003c/code\u003e prefix.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003eSec-\u003c/code\u003e prefix also ensures that these headers are only generated by the\nbrowser and not added by potentially-malicious developers. That gives servers\nfurther guarantees when processing those headers. It may also enable us to\nsimplify the related Fetch processing model, as it clearly indicates that these\nare headers that were added by the user agent.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eCaching considerations\u003c/h2\u003e\u003ca id=\"user-content-caching-considerations\" class=\"anchor\" aria-label=\"Permalink: Caching considerations\" href=\"#caching-considerations\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWhen adapting content to specific Client Hints request headers, servers should\nadd the \u003ccode\u003eVary\u003c/code\u003e header to their responses, with a value of each Client Hint\nheader used, in order to indicate such adaptation to caches, and make sure that\nClient-Hint-negotiated resources are not cached using only their URL as the\ncache key.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis is also the reason that each Client Hint is represented using a separate\nheader. Ensuring that each hint has its own header reduces cache variance in\nresponses that may rely on some hints, but not others.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSecurity and privacy considerations\u003c/h1\u003e\u003ca id=\"user-content-security-and-privacy-considerations\" class=\"anchor\" aria-label=\"Permalink: Security and privacy considerations\" href=\"#security-and-privacy-considerations\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThere are a few key mechanisms we already discussed that are part of the Client\nHints infrastructure, which enable secure and privacy-preserving deployment\nof Client Hints:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eServer opt-ins must be delivered on a top-level navigation request, over a\nsecure connection.\u003c/li\u003e\n\u003cli\u003eHints are only delivered with same-origin requests, over a secure connection.\u003c/li\u003e\n\u003cli\u003eIf the first party wants hints to be delivered to certain third-party hosts,\nthe first-party can explicitly delegate specific hints to specific hostnames.\u003c/li\u003e\n\u003cli\u003eHints are \u003ccode\u003eSec-\u003c/code\u003e prefixed, to provide servers with more confidence regarding\nthe values they deliver, as well as to avoid legacy server bugs.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eBeyond that, when implementing Client Hints, browsers should make sure that\ncertain privacy-related precautions are being taken:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eClient Hint features should not be shipped unless there is a Javascript-based\nequivalent API, which enables developers access to the same data and is\ndeemed privacy-safe to ship\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eThis follows Extensible Web principles — we want the\nshipped features to be polyfillable (Even if \u003ccode\u003eSec-\u003c/code\u003e headers cannot\nbe added by developers)\u003c/li\u003e\n\u003cli\u003eAs discussed above, from a privacy perspective, we consider Client Hints to\nbe a potential active fingerprinting vector equivalent. Therefore, it is\nonly safe to ship it with hints that provide information which is already\navailable through other active fingerprinting means, such as a Javascript\nAPI.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eBrowsers should turn off hints when users choose to turn off Javascript\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eIf the user has turned off Javascript, Javascript-based active\nfingerprinting vectors have been disabled. Since that could have been the\nuser's intention when turning off scripting, browsers should similarly turn\noff Client Hints.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eBrowsers can choose to omit or to lie about certain Client Hints to increase\ntheir users' privacy\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eBrowsers are free to take privacy-enhancing heuristics into account when\ndeciding to respect the server's opt-in to receive them. Similar heuristics\ncan also be used when deciding what values to send.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMotivation and trade-offs\u003c/h1\u003e\u003ca id=\"user-content-motivation-and-trade-offs\" class=\"anchor\" aria-label=\"Permalink: Motivation and trade-offs\" href=\"#motivation-and-trade-offs\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eProactive content negotiation and its benefits\u003c/h2\u003e\u003ca id=\"user-content-proactive-content-negotiation-and-its-benefits\" class=\"anchor\" aria-label=\"Permalink: Proactive content negotiation and its benefits\" href=\"#proactive-content-negotiation-and-its-benefits\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWhen choosing a solution that will provide alternative resources to the user's\nbrowser based on various factors, we are faced with a design dillema: Either\nthe developer can provide the browser with a list of all potential URLs and let\nthe browser choose the best one, or can use \u003cstrong\u003econtent negotiation\u003c/strong\u003e and let the\nserver pick the best-fit resource variant.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe former option certainly has its place, and it is used successfully across\nthe web in examples like \u003ccode\u003e\u0026lt;picture\u0026gt;\u003c/code\u003e, \u003ccode\u003esrcset\u003c/code\u003e, \u003ccode\u003e\u0026lt;video\u0026gt;\u003c/code\u003e, etc.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAt the same time, there are some use-cases where it is not sufficient.\nTransformation and adaptation of the page's subresources in a manner that is\nindependent from the page's markup can result in more scalable solutions, that\ndon't have to be assimilated into markup related workflows.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eBy decoupling the resource selection from markup, we can enable external\nservices to perform those transformations automatically. We can also provide a\nwider range of resources, as offering more resources may result in some\nserver-side costs, but those costs are not directly exposed to the user in the\nform of markup bloat.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThere are many potential dimensions by which we'd want the content adapted to\nthe user:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eDevice characteristics\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eScreen dimensions\u003c/li\u003e\n\u003cli\u003eScreen density\u003c/li\u003e\n\u003cli\u003eMemory and CPU capabilities\u003c/li\u003e\n\u003cli\u003eRange of colors the screen can display\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eBrowser characteristics\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eUser Agent major or full version\u003c/li\u003e\n\u003cli\u003eDevice model, OS version and platform\u003c/li\u003e\n\u003cli\u003eSupported formats and codecs\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eUser preferences\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eData-saving preferences\u003c/li\u003e\n\u003cli\u003ePreferred language\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eNetwork conditions\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eRTT\u003c/li\u003e\n\u003cli\u003eEffective bandwidth\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eThe list above is not necessarily exhaustive, but it can give us an idea as to\nwhy simply providing the browser with (possibly very long) list of resources\nwhich have been adapted across multiple dimensions of variability may not be\npractical, at least in some cases.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAn opt-in solution and its tradeoffs\u003c/h2\u003e\u003ca id=\"user-content-an-opt-in-solution-and-its-tradeoffs\" class=\"anchor\" aria-label=\"Permalink: An opt-in solution and its tradeoffs\" href=\"#an-opt-in-solution-and-its-tradeoffs\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eClient Hints requires that servers explicitly advertise and request sets of\nhints that they would like to receive. This makes such requests explicit and\ndoes not enable passive fingerprinting using those hints, which is one of the\nkey and guiding requirements for Client Hints.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIndiscriminately broadcasting user data carries other downsides, as well. Exposing\nall details and adaptation dimensions to all servers runs\na risk of bloating request headers. There are many potential details that can\nbe useful for content negotiation, and we expect that list to grow over time.\nSending all of the hints all the time can quickly result in bloat, and make\nrequests significantly larger than they should be. To avoid that, it is more\nefficient for servers to specifically request the headers that they would take into\naccount, and for client to only send these hints with outgoing requests.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eUnfortunately, that decision doesn't come without tradeoffs. Client Hints as an\nopt-in mechanism currently means that content adaptation of the initial\nnavigation request on the very first view is not possible, at least not without\nhacks.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAt the same time, for features which are critical for content negotiation of\nnavigation requests, browsers may choose to send hints regardless of a server\nopt-in, when they deem that the information in question doesn't increase the\npassive fingerprinting surface.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cem\u003eNote:\u003c/em\u003e there may be other, out-of-band, opt-in mechanisms in the future that\ncould enable delivery of hints on first navigation to new origins, such as\nOrigin Policy.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ePrivacy enhancing content negotiation\u003c/h2\u003e\u003ca id=\"user-content-privacy-enhancing-content-negotiation\" class=\"anchor\" aria-label=\"Permalink: Privacy enhancing content negotiation\" href=\"#privacy-enhancing-content-negotiation\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eContent negotiation is typically viewed as a mechanism that enables\npassive fingerprinting, by adding different bits of data to different user's\nrequests, by default, and enabling servers to use those differences to tell\nusers apart without leaving any trace of that activity.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eClient Hints’ opt-in mechanism enables us to avoid this problem, as\nservers need to tell the browsers which information they need, making any such\nuse of fingerprinting detectable.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eBut, Client Hints can also enable us to do more than that for user privacy, and\nturn passive-fingerprinting-enabling content-negotiation mechanisms (e.g. The\n\u003ccode\u003eUser-Agent\u003c/code\u003e or \u003ccode\u003eAccept-Language\u003c/code\u003e request headers) into opt-in-only mechanisms.\nRestricting the amount of entropy that browsers send by default would\neffectively reduce the passive fingerprinting surface on the web, and Client\nHints’ opt-in mechanism would enable browsers to keep closer tabs on entities\nthat use that information for seemingly nefarious reasons.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eConclusion\u003c/h1\u003e\u003ca id=\"user-content-conclusion\" class=\"anchor\" aria-label=\"Permalink: Conclusion\" href=\"#conclusion\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eClient Hints provides a powerful content negotiation mechanism that enables us\nto adapt content to users' needs without compromising their privacy. It does\nthat by requiring server opt-in, which guarantees that access to the\ninformation requires active and tracable action on the server's side. As such,\nthe mechanism does not increase the web's current active fingerprinting\nsurface.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe Client Hints infrastructure can be further used to reduce the web's passive\nfingerprinting surface, by converting common use-cases for today's passive\nfingerprinting vectors (e.g. the \u003ccode\u003eUser-Agent\u003c/code\u003e string) into Client Hints which\nrequire a specific opt-in.\u003c/p\u003e\n\u003c/article\u003e","loaded":true,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":[{"level":1,"text":"Explainer","anchor":"explainer","htmlText":"Explainer"},{"level":1,"text":"The Client Hints infrastructure","anchor":"the-client-hints-infrastructure","htmlText":"The Client Hints infrastructure"},{"level":2,"text":"Opt-in mechanism","anchor":"opt-in-mechanism","htmlText":"Opt-in mechanism"},{"level":3,"text":"Accept-CH","anchor":"accept-ch","htmlText":"Accept-CH"},{"level":4,"text":"Example","anchor":"example","htmlText":"Example"},{"level":2,"text":"Same-Origin Policy","anchor":"same-origin-policy","htmlText":"Same-Origin Policy"},{"level":2,"text":"Cross-origin hint delegation","anchor":"cross-origin-hint-delegation","htmlText":"Cross-origin hint delegation"},{"level":3,"text":"Example","anchor":"example-1","htmlText":"Example"},{"level":3,"text":"Privacy implications","anchor":"privacy-implications","htmlText":"Privacy implications"},{"level":2,"text":"Sec- prefix","anchor":"sec--prefix","htmlText":"Sec- prefix"},{"level":2,"text":"Caching considerations","anchor":"caching-considerations","htmlText":"Caching considerations"},{"level":1,"text":"Security and privacy considerations","anchor":"security-and-privacy-considerations","htmlText":"Security and privacy considerations"},{"level":1,"text":"Motivation and trade-offs","anchor":"motivation-and-trade-offs","htmlText":"Motivation and trade-offs"},{"level":2,"text":"Proactive content negotiation and its benefits","anchor":"proactive-content-negotiation-and-its-benefits","htmlText":"Proactive content negotiation and its benefits"},{"level":2,"text":"An opt-in solution and its tradeoffs","anchor":"an-opt-in-solution-and-its-tradeoffs","htmlText":"An opt-in solution and its tradeoffs"},{"level":2,"text":"Privacy enhancing content negotiation","anchor":"privacy-enhancing-content-negotiation","htmlText":"Privacy enhancing content negotiation"},{"level":1,"text":"Conclusion","anchor":"conclusion","htmlText":"Conclusion"}],"siteNavLoginPath":"/login?return_to=https%3A%2F%2Fgithub.com%2Feeeps%2Fclient-hints-infrastructure"}},{"displayName":"CODE_OF_CONDUCT.md","repoName":"client-hints-infrastructure","refName":"main","path":"CODE_OF_CONDUCT.md","preferredFileType":"code_of_conduct","tabName":"Code of 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octicon-list-unordered" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" style="display:inline-block;user-select:none;vertical-align:text-bottom;overflow:visible"><path d="M5.75 2.5h8.5a.75.75 0 0 1 0 1.5h-8.5a.75.75 0 0 1 0-1.5Zm0 5h8.5a.75.75 0 0 1 0 1.5h-8.5a.75.75 0 0 1 0-1.5Zm0 5h8.5a.75.75 0 0 1 0 1.5h-8.5a.75.75 0 0 1 0-1.5ZM2 14a1 1 0 1 1 0-2 1 1 0 0 1 0 2Zm1-6a1 1 0 1 1-2 0 1 1 0 0 1 2 0ZM2 4a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg></button></div><div class="Box-sc-g0xbh4-0 QkQOb js-snippet-clipboard-copy-unpositioned undefined" data-hpc="true"><article class="markdown-body entry-content container-lg" itemprop="text"><div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Explainer</h1><a id="user-content-explainer" class="anchor" aria-label="Permalink: Explainer" href="#explainer"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Client Hints is collection of HTTP and user-agent features that enables privacy-preserving, proactive content negotiation with an explicit third-party delegation mechanism:</p> <ul dir="auto"> <li>Proactive content negotiation at the HTTP layer (defined in the <a href="https://tools.ietf.org/html/rfc8942" rel="nofollow">IETF RFC</a>) enables servers to request delivery of specific hints, in order to enable optimized and automated selection of resources based on a user's device, conditions and preferences, and lets clients decide which hint requests they want to grant, with per-hint and per-origin granularity.</li> <li>Integration of said mechanism with web concepts (defined in this <a href="https://wicg.github.io/client-hints-infrastructure" rel="nofollow">specification</a>) specification) enables browsers to benefit from content adaptation, and have it play nicely with current web restrictions (e.g. same-origin policy).</li> <li>The opt-in nature of the mechanism enables browsers to advertise requested hint data (e.g. user agent and device characteristics) selectively to secure-transport origins, instead of appending such data on every outgoing request.</li> <li>Origin opt-in applies to same-origin assets only and delivery to third-party origins is subject to explicit first party delegation via Feature Policy, enabling tight control over which third party origins can access requested hint data.</li> </ul> <p dir="auto">The goal of Client Hints is to <strong>reduce passive fingerprinting</strong> on the web while <strong>enabling scalable and privacy preserving content adaptation</strong> between client and server, via a standardized set of content negotiation primitives at the HTTP and user agent levels.</p> <p dir="auto">This document outlines the Client Hints infrastructure, explains it at a high level and points to the various specification and draft proposals in which it is officially defined. It does not describe the various features and hints which rely on this infrastructure. They will be defined in their respective specifications.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">The Client Hints infrastructure</h1><a id="user-content-the-client-hints-infrastructure" class="anchor" aria-label="Permalink: The Client Hints infrastructure" href="#the-client-hints-infrastructure"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">How can servers opt into receiving hints from the client? How should clients send those hints? And how should that be handled across origins?</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Opt-in mechanism</h2><a id="user-content-opt-in-mechanism" class="anchor" aria-label="Permalink: Opt-in mechanism" href="#opt-in-mechanism"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">In order to receive Client Hints, servers must opt-in by using the HTTP response headers described in the sections below. For security and privacy reasons, the opt-in must be received on the response of the top-level navigation, over a secure connection. Servers can similarly opt-in by using the headers' HTML equivalents, the <code><meta></code> HTML tag and its <code>http-equiv</code> attribute.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto"><code>Accept-CH</code></h3><a id="user-content-accept-ch" class="anchor" aria-label="Permalink: Accept-CH" href="#accept-ch"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The <code>Accept-CH</code> header enables servers to request specific hints from the browser. The header's value is a comma separated list, where each value in that list represents a request header hint that the server is interested in receiving.</p> <p dir="auto">When an <code>Accept-CH</code> opt-in is received on the top-level navigation, same-origin subresource requests on that page will receive the requested hints, unless the client has reasons to avoid sending that information to the server.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Example</h4><a id="user-content-example" class="anchor" aria-label="Permalink: Example" href="#example"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">If a server's response to a navigation request includes the <code>Accept-CH: foo, bar</code> header, same-origin subresource requests on the page will include the <code>Sec-Foo: foo-value</code> and <code>Sec-Bar: bar-value</code> request headers.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Same-Origin Policy</h2><a id="user-content-same-origin-policy" class="anchor" aria-label="Permalink: Same-Origin Policy" href="#same-origin-policy"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">There are two important restrictions on the opt-in mechanism description above:</p> <ul dir="auto"> <li>opt-ins will only be granted when the opt-in headers are received with a top-level navigation resource</li> <li>after the opt-in, hints will only be sent with same-origin requests</li> </ul> <p dir="auto">Why are these limitations important?</p> <p dir="auto">As mentioned before, we don't want the mechanism to be used to increase fingerprinting on the web. The information that Client Hints provide should generally be available through Javascript APIs (see the <a href="#privacy-considerations">Privacy Considerations</a> section for more details).</p> <p dir="auto">That means that for <em>active</em> resources (e.g. HTML), Client Hints does not increase the active fingerprinting surface. Servers serving active resources can already exfiltrate the data that hints provide, via scripts, styles or certain elements (e.g. <code><img srcset></code>). Client Hints only provides servers with a more convenient and performant way to get that information for content-negotiation purposes and ensures that authors and user agents have ultimate control over which servers get what information.</p> <p dir="auto">Client Hints also allow this information to be collected on <em>passive</em> sub-resources (e.g. images). We don't want third parties to be able to exfiltrate data about the client/user without explicit permission from the first party. And we certainly don't want them to be able to exfiltrate it for the entire third-party origin, beyond the lifetime of the current navigation.</p> <p dir="auto">Therefore, by default, Client Hints opt-in is only valid when delivered on top-level navigation requests, and, by default, applies only to same-origin resources. Cross-origin requests must only receive hints when explicit permission is given by the first-party origin.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Cross-origin hint delegation</h2><a id="user-content-cross-origin-hint-delegation" class="anchor" aria-label="Permalink: Cross-origin hint delegation" href="#cross-origin-hint-delegation"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Why do we need cross-origin Client Hints?</p> <p dir="auto">As the purpose of for client hints is to enable content negotiation at scale, and as many optimization services are offered over different origins than the main page's origin(e.g., CDNs, resource-specific hosting services, or dedicated, resource-specific, first-party sub-domains), cross-origin support is a vital part of Client Hints.</p> <p dir="auto">In order to support these use-cases, we have defined delegation of Client Hints to specific cross-origin hosts, using Feature Policy.</p> <p dir="auto">Servers can opt-in to such delegation by applying <code>ch-</code> prefixed feature policies for the desired hints.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Example</h3><a id="user-content-example-1" class="anchor" aria-label="Permalink: Example" href="#example-1"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">A first-party server sending the following header <code>Feature-Policy: ch-example foo.com bar.com; ch-example-2 foobar.org</code> as part of a top-level navigation response will delegate the <code>example</code> hint to the "foo.com" and "bar.com" origins and <code>example-2</code> to the "foobar.org" origin. So, the client would know that it had explicit permission from the first party to send these hints to these third parties, so that these third parties could perform content adaptation based on them.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Privacy implications</h3><a id="user-content-privacy-implications" class="anchor" aria-label="Permalink: Privacy implications" href="#privacy-implications"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Why is it privacy-safe for pages to delegate hints to certain third party origins?</p> <p dir="auto">Since we're treating Client Hints as an active fingerprinting equivalent, we are comfortable with the information it exposes to first-party servers, as the same information is already freely available in the equivalent Javascript APIs. Similarly, third party delegation is safe because first parties are already able to use other means (such as link decoration), to achieve the same information sharing with third parties, in less convenient and performant ways.</p> <p dir="auto">In short, first parties already have the power to share information about the client with third parties. Third party delegation of Client Hints provides a cleaner pathway for that sharing, and ensures that first parties, and ultimately clients, are aware and in control of what is being shared with who.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto"><code>Sec-</code> prefix</h2><a id="user-content-sec--prefix" class="anchor" aria-label="Permalink: Sec- prefix" href="#sec--prefix"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Adding new request headers increases the risk that legacy server systems already use those values for a different purpose. Changing the request header values that such legacy systems receive may result in server bugs.</p> <p dir="auto">While that risk is significantly mitigated by the opt-in mechanisms of Client Hints (as servers would be opting in to get Client Hints headers), we feel it is required to mitigate it even further. So, Client Hints request headers should be preceded by the <code>Sec-</code> prefix.</p> <p dir="auto">The <code>Sec-</code> prefix also ensures that these headers are only generated by the browser and not added by potentially-malicious developers. That gives servers further guarantees when processing those headers. It may also enable us to simplify the related Fetch processing model, as it clearly indicates that these are headers that were added by the user agent.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Caching considerations</h2><a id="user-content-caching-considerations" class="anchor" aria-label="Permalink: Caching considerations" href="#caching-considerations"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">When adapting content to specific Client Hints request headers, servers should add the <code>Vary</code> header to their responses, with a value of each Client Hint header used, in order to indicate such adaptation to caches, and make sure that Client-Hint-negotiated resources are not cached using only their URL as the cache key.</p> <p dir="auto">This is also the reason that each Client Hint is represented using a separate header. Ensuring that each hint has its own header reduces cache variance in responses that may rely on some hints, but not others.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Security and privacy considerations</h1><a id="user-content-security-and-privacy-considerations" class="anchor" aria-label="Permalink: Security and privacy considerations" href="#security-and-privacy-considerations"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">There are a few key mechanisms we already discussed that are part of the Client Hints infrastructure, which enable secure and privacy-preserving deployment of Client Hints:</p> <ul dir="auto"> <li>Server opt-ins must be delivered on a top-level navigation request, over a secure connection.</li> <li>Hints are only delivered with same-origin requests, over a secure connection.</li> <li>If the first party wants hints to be delivered to certain third-party hosts, the first-party can explicitly delegate specific hints to specific hostnames.</li> <li>Hints are <code>Sec-</code> prefixed, to provide servers with more confidence regarding the values they deliver, as well as to avoid legacy server bugs.</li> </ul> <p dir="auto">Beyond that, when implementing Client Hints, browsers should make sure that certain privacy-related precautions are being taken:</p> <ul dir="auto"> <li>Client Hint features should not be shipped unless there is a Javascript-based equivalent API, which enables developers access to the same data and is deemed privacy-safe to ship <ul dir="auto"> <li>This follows Extensible Web principles — we want the shipped features to be polyfillable (Even if <code>Sec-</code> headers cannot be added by developers)</li> <li>As discussed above, from a privacy perspective, we consider Client Hints to be a potential active fingerprinting vector equivalent. Therefore, it is only safe to ship it with hints that provide information which is already available through other active fingerprinting means, such as a Javascript API.</li> </ul> </li> <li>Browsers should turn off hints when users choose to turn off Javascript <ul dir="auto"> <li>If the user has turned off Javascript, Javascript-based active fingerprinting vectors have been disabled. Since that could have been the user's intention when turning off scripting, browsers should similarly turn off Client Hints.</li> </ul> </li> <li>Browsers can choose to omit or to lie about certain Client Hints to increase their users' privacy <ul dir="auto"> <li>Browsers are free to take privacy-enhancing heuristics into account when deciding to respect the server's opt-in to receive them. Similar heuristics can also be used when deciding what values to send.</li> </ul> </li> </ul> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Motivation and trade-offs</h1><a id="user-content-motivation-and-trade-offs" class="anchor" aria-label="Permalink: Motivation and trade-offs" href="#motivation-and-trade-offs"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Proactive content negotiation and its benefits</h2><a id="user-content-proactive-content-negotiation-and-its-benefits" class="anchor" aria-label="Permalink: Proactive content negotiation and its benefits" href="#proactive-content-negotiation-and-its-benefits"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">When choosing a solution that will provide alternative resources to the user's browser based on various factors, we are faced with a design dillema: Either the developer can provide the browser with a list of all potential URLs and let the browser choose the best one, or can use <strong>content negotiation</strong> and let the server pick the best-fit resource variant.</p> <p dir="auto">The former option certainly has its place, and it is used successfully across the web in examples like <code><picture></code>, <code>srcset</code>, <code><video></code>, etc.</p> <p dir="auto">At the same time, there are some use-cases where it is not sufficient. Transformation and adaptation of the page's subresources in a manner that is independent from the page's markup can result in more scalable solutions, that don't have to be assimilated into markup related workflows.</p> <p dir="auto">By decoupling the resource selection from markup, we can enable external services to perform those transformations automatically. We can also provide a wider range of resources, as offering more resources may result in some server-side costs, but those costs are not directly exposed to the user in the form of markup bloat.</p> <p dir="auto">There are many potential dimensions by which we'd want the content adapted to the user:</p> <ul dir="auto"> <li>Device characteristics <ul dir="auto"> <li>Screen dimensions</li> <li>Screen density</li> <li>Memory and CPU capabilities</li> <li>Range of colors the screen can display</li> </ul> </li> <li>Browser characteristics <ul dir="auto"> <li>User Agent major or full version</li> <li>Device model, OS version and platform</li> <li>Supported formats and codecs</li> </ul> </li> <li>User preferences <ul dir="auto"> <li>Data-saving preferences</li> <li>Preferred language</li> </ul> </li> <li>Network conditions <ul dir="auto"> <li>RTT</li> <li>Effective bandwidth</li> </ul> </li> </ul> <p dir="auto">The list above is not necessarily exhaustive, but it can give us an idea as to why simply providing the browser with (possibly very long) list of resources which have been adapted across multiple dimensions of variability may not be practical, at least in some cases.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">An opt-in solution and its tradeoffs</h2><a id="user-content-an-opt-in-solution-and-its-tradeoffs" class="anchor" aria-label="Permalink: An opt-in solution and its tradeoffs" href="#an-opt-in-solution-and-its-tradeoffs"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Client Hints requires that servers explicitly advertise and request sets of hints that they would like to receive. This makes such requests explicit and does not enable passive fingerprinting using those hints, which is one of the key and guiding requirements for Client Hints.</p> <p dir="auto">Indiscriminately broadcasting user data carries other downsides, as well. Exposing all details and adaptation dimensions to all servers runs a risk of bloating request headers. There are many potential details that can be useful for content negotiation, and we expect that list to grow over time. Sending all of the hints all the time can quickly result in bloat, and make requests significantly larger than they should be. To avoid that, it is more efficient for servers to specifically request the headers that they would take into account, and for client to only send these hints with outgoing requests.</p> <p dir="auto">Unfortunately, that decision doesn't come without tradeoffs. Client Hints as an opt-in mechanism currently means that content adaptation of the initial navigation request on the very first view is not possible, at least not without hacks.</p> <p dir="auto">At the same time, for features which are critical for content negotiation of navigation requests, browsers may choose to send hints regardless of a server opt-in, when they deem that the information in question doesn't increase the passive fingerprinting surface.</p> <p dir="auto"><em>Note:</em> there may be other, out-of-band, opt-in mechanisms in the future that could enable delivery of hints on first navigation to new origins, such as Origin Policy.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Privacy enhancing content negotiation</h2><a id="user-content-privacy-enhancing-content-negotiation" class="anchor" aria-label="Permalink: Privacy enhancing content negotiation" href="#privacy-enhancing-content-negotiation"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Content negotiation is typically viewed as a mechanism that enables passive fingerprinting, by adding different bits of data to different user's requests, by default, and enabling servers to use those differences to tell users apart without leaving any trace of that activity.</p> <p dir="auto">Client Hints’ opt-in mechanism enables us to avoid this problem, as servers need to tell the browsers which information they need, making any such use of fingerprinting detectable.</p> <p dir="auto">But, Client Hints can also enable us to do more than that for user privacy, and turn passive-fingerprinting-enabling content-negotiation mechanisms (e.g. The <code>User-Agent</code> or <code>Accept-Language</code> request headers) into opt-in-only mechanisms. Restricting the amount of entropy that browsers send by default would effectively reduce the passive fingerprinting surface on the web, and Client Hints’ opt-in mechanism would enable browsers to keep closer tabs on entities that use that information for seemingly nefarious reasons.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Conclusion</h1><a id="user-content-conclusion" class="anchor" aria-label="Permalink: Conclusion" href="#conclusion"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Client Hints provides a powerful content negotiation mechanism that enables us to adapt content to users' needs without compromising their privacy. It does that by requiring server opt-in, which guarantees that access to the information requires active and tracable action on the server's side. As such, the mechanism does not increase the web's current active fingerprinting surface.</p> <p dir="auto">The Client Hints infrastructure can be further used to reduce the web's passive fingerprinting surface, by converting common use-cases for today's passive fingerprinting vectors (e.g. the <code>User-Agent</code> string) into Client Hints which require a specific opt-in.</p> </article></div></div></div></div></div> <!-- --> <!-- --> <script type="application/json" id="__PRIMER_DATA_:R0:__">{"resolvedServerColorMode":"day"}</script></div> </react-partial> <input type="hidden" data-csrf="true" value="ezMUiZoye14GMFcUXsDBgy+1U1SI/+OCpqW+eRXxxwdi5R9p/Anrel72plC4M/llcn1PuIaTLcv3fHnERIy47g==" /> </div> <div data-view-component="true" class="Layout-sidebar"> <div class="BorderGrid about-margin" data-pjax> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <div class="hide-sm hide-md"> <h2 class="mb-3 h4">About</h2> <div class="f4 my-3 color-fg-muted text-italic"> No description, 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