System parameters | Cloud APIs

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cloud-button cloud-button--primary" track-metadata-position="nav" track-name="gcpCta" track-metadata-eventDetail="nav" data-overflow-container="right" >Start free</a> </div> </div> </div> </div> </div> </devsite-header> <devsite-book-nav scrollbars > <div class="devsite-book-nav-filter" > <span class="filter-list-icon material-icons" aria-hidden="true"></span> <input type="text" placeholder="Filter" aria-label="Type to filter" role="searchbox"> <span class="filter-clear-button hidden" data-title="Clear filter" aria-label="Clear filter" role="button" tabindex="0"></span> </div> <nav class="devsite-book-nav devsite-nav nocontent" aria-label="Side menu"> <div class="devsite-mobile-header"> <button type="button" id="devsite-close-nav" class="devsite-header-icon-button button-flat material-icons gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Close navigation" aria-label="Close navigation"> </button> <div class="devsite-product-name-wrapper"> <a href="/" class="devsite-site-logo-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Site logo" track-type="globalNav" track-name="googleCloud" track-metadata-position="nav" track-metadata-eventDetail="nav"> <picture> <img src="https://www.gstatic.com/devrel-devsite/prod/v870e399c64f7c43c99a3043db4b3a74327bb93d0914e84a0c3dba90bbfd67625/cloud/images/cloud-logo.svg" class="devsite-site-logo" alt="Google Cloud"> </picture> </a> <span class="devsite-product-name"> <ul class="devsite-breadcrumb-list" > <li class="devsite-breadcrumb-item devsite-has-google-wordmark"> </li> </ul> </span> </div> </div> <div class="devsite-book-nav-wrapper"> <div class="devsite-mobile-nav-top"> <ul class="devsite-nav-list"> <li class="devsite-nav-item"> <a href="/docs" class="devsite-nav-title gc-analytics-event devsite-nav-has-children devsite-nav-active" data-category="Site-Wide Custom Events" data-label="Tab: Documentation" track-name="docs-home" track-link-column-type="single-column" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Documentation" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Documentation </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/tech-area-overviews" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: Technology areas" track-name="technology-areas" track-link-column-type="single-column" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Technology areas" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Technology areas </span> </a> <ul class="devsite-nav-responsive-tabs devsite-nav-has-menu "> <li class="devsite-nav-item"> <span class="devsite-nav-title" tooltip data-category="Site-Wide Custom Events" data-label="Tab: Technology areas" track-name="technology-areas" track-link-column-type="single-column" > <span class="devsite-nav-text" tooltip menu="Technology areas"> More </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="Technology areas"> </span> </span> </li> </ul> </li> <li class="devsite-nav-item"> <a href="/docs/cross-product-overviews" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: Cross-product tools" track-name="crossproduct" track-link-column-type="single-column" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Cross-product tools" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Cross-product tools </span> </a> <ul class="devsite-nav-responsive-tabs devsite-nav-has-menu "> <li class="devsite-nav-item"> <span class="devsite-nav-title" tooltip data-category="Site-Wide Custom Events" data-label="Tab: Cross-product tools" track-name="crossproduct" track-link-column-type="single-column" > <span class="devsite-nav-text" tooltip menu="Cross-product tools"> More </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="Cross-product tools"> </span> </span> </li> </ul> </li> <li class="devsite-nav-item"> <a href="/" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: Related sites" track-name="related-sites" track-link-column-type="single-column" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Related sites" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Related sites </span> </a> <ul class="devsite-nav-responsive-tabs devsite-nav-has-menu "> <li class="devsite-nav-item"> <span class="devsite-nav-title" tooltip data-category="Site-Wide Custom Events" data-label="Tab: Related sites" track-name="related-sites" track-link-column-type="single-column" > <span class="devsite-nav-text" tooltip menu="Related sites"> More </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="Related sites"> </span> </span> </li> </ul> </li> <li class="devsite-nav-item"> <a href="//console.cloud.google.com/" class="devsite-nav-title gc-analytics-event " referrerpolicy="no-referrer-when-downgrade" track-type="globalNav" track-metadata-position="nav" track-name="console" track-metadata-eventDetail="nav" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Console" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Console </span> </a> </li> <li class="devsite-nav-item"> <a href="/contact" class="cta-button-secondary button" data-overflow-wrapper="tab" track-type="contact" track-name="sales" data-overflow-container="left" track-metadata-position="nav" track-metadata-eventDetail="nav" data-overflow="devsite-tabs-wrapper" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Contact Us" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Contact Us </span> </a> </li> <li class="devsite-nav-item"> <a href="//console.cloud.google.com/freetrial" class="cloud-free-trial-button cta-button-primary button-primary button cloud-button cloud-button--primary" track-type="freeTrial" referrerpolicy="no-referrer-when-downgrade" data-overflow="devsite-top-logo-row" data-overflow-class="devsite-header-link devsite-top-button button cloud-free-trial-button cloud-free-trial-enabled cloud-button cloud-button--primary" track-metadata-position="nav" track-name="gcpCta" track-metadata-eventDetail="nav" data-overflow-container="right" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Start free" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Start free </span> </a> </li> </ul> </div> <div class="devsite-mobile-nav-bottom"> <ul class="devsite-nav-list" menu="_book"> <li class="devsite-nav-item devsite-nav-heading"><div class="devsite-nav-title devsite-nav-title-no-path"> <span class="devsite-nav-text" tooltip>Cloud APIs</span> </div></li> <li class="devsite-nav-item"><a href="/apis" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /apis" track-type="bookNav" track-name="click" track-metadata-eventdetail="/apis" ><span class="devsite-nav-text" tooltip>Product overview</span></a></li> <li class="devsite-nav-item"><a href="/apis/docs/overview" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /apis/docs/overview" track-type="bookNav" track-name="click" track-metadata-eventdetail="/apis/docs/overview" ><span class="devsite-nav-text" tooltip>Google Cloud APIs</span></a></li> <li class="devsite-nav-item"><a href="/apis/docs/resources/enterprise-apis" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /apis/docs/resources/enterprise-apis" track-type="bookNav" track-name="click" track-metadata-eventdetail="/apis/docs/resources/enterprise-apis" ><span class="devsite-nav-text" tooltip>Google Enterprise APIs</span></a></li> <li class="devsite-nav-item"><a href="/apis/docs/client-libraries-explained" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /apis/docs/client-libraries-explained" track-type="bookNav" track-name="click" track-metadata-eventdetail="/apis/docs/client-libraries-explained" ><span class="devsite-nav-text" tooltip>Client libraries explained</span></a></li> <li class="devsite-nav-item devsite-nav-heading"><div class="devsite-nav-title devsite-nav-title-no-path"> <span class="devsite-nav-text" tooltip>Using Cloud APIs</span> </div></li> <li class="devsite-nav-item"><a href="/apis/docs/getting-started" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /apis/docs/getting-started" track-type="bookNav" track-name="click" track-metadata-eventdetail="/apis/docs/getting-started" ><span class="devsite-nav-text" tooltip>Getting started</span></a></li> <li class="devsite-nav-item"><a href="/apis/docs/capping-api-usage" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /apis/docs/capping-api-usage" track-type="bookNav" track-name="click" track-metadata-eventdetail="/apis/docs/capping-api-usage" ><span class="devsite-nav-text" tooltip>Capping API usage</span></a></li> <li class="devsite-nav-item"><a href="/apis/docs/monitoring" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /apis/docs/monitoring" track-type="bookNav" track-name="click" track-metadata-eventdetail="/apis/docs/monitoring" ><span class="devsite-nav-text" tooltip>Monitoring API usage</span></a></li> <li class="devsite-nav-item"><a href="/apis/docs/troubleshooting" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /apis/docs/troubleshooting" track-type="bookNav" track-name="click" track-metadata-eventdetail="/apis/docs/troubleshooting" ><span class="devsite-nav-text" tooltip>Troubleshooting API usage</span></a></li> <li class="devsite-nav-item"><a href="/apis/docs/http" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /apis/docs/http" track-type="bookNav" track-name="click" track-metadata-eventdetail="/apis/docs/http" ><span class="devsite-nav-text" tooltip>HTTP guidelines</span></a></li> <li class="devsite-nav-item"><a href="/apis/docs/system-parameters" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /apis/docs/system-parameters" track-type="bookNav" track-name="click" track-metadata-eventdetail="/apis/docs/system-parameters" ><span class="devsite-nav-text" tooltip>System parameters</span></a></li> <li class="devsite-nav-item devsite-nav-heading"><div class="devsite-nav-title devsite-nav-title-no-path"> <span class="devsite-nav-text" tooltip>Using client libraries</span> </div></li> <li class="devsite-nav-item"><a href="/apis/docs/cloud-client-libraries" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /apis/docs/cloud-client-libraries" track-type="bookNav" track-name="click" track-metadata-eventdetail="/apis/docs/cloud-client-libraries" ><span class="devsite-nav-text" tooltip>Cloud Client Libraries</span></a></li> <li class="devsite-nav-item"><a href="/apis/docs/client-libraries-best-practices" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /apis/docs/client-libraries-best-practices" track-type="bookNav" track-name="click" track-metadata-eventdetail="/apis/docs/client-libraries-best-practices" ><span class="devsite-nav-text" tooltip>Client libraries best practices</span></a></li> <li class="devsite-nav-item devsite-nav-heading"><div class="devsite-nav-title devsite-nav-title-no-path"> <span class="devsite-nav-text" tooltip>API design guide</span> </div></li> <li class="devsite-nav-item"><a href="/apis/design" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /apis/design" track-type="bookNav" track-name="click" track-metadata-eventdetail="/apis/design" ><span class="devsite-nav-text" tooltip>Introduction</span></a></li> <li class="devsite-nav-item"><a href="/apis/design/naming_convention" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /apis/design/naming_convention" track-type="bookNav" track-name="click" track-metadata-eventdetail="/apis/design/naming_convention" ><span class="devsite-nav-text" tooltip>Naming conventions</span></a></li> <li class="devsite-nav-item"><a href="/apis/design/directory_structure" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /apis/design/directory_structure" track-type="bookNav" track-name="click" track-metadata-eventdetail="/apis/design/directory_structure" ><span class="devsite-nav-text" tooltip>Directory structure</span></a></li> <li class="devsite-nav-item"><a href="/apis/design/changelog" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /apis/design/changelog" track-type="bookNav" track-name="click" track-metadata-eventdetail="/apis/design/changelog" ><span class="devsite-nav-text" tooltip>Changelog</span></a></li> </ul> <ul class="devsite-nav-list" menu="Technology areas" aria-label="Side menu" hidden> <li class="devsite-nav-item"> <a href="/docs/ai-ml" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: AI and ML" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > AI and ML </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/application-development" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Application development" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Application development </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/application-hosting" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Application hosting" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Application hosting </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/compute-area" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Compute" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Compute </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/data" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Data analytics and pipelines" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Data analytics and pipelines </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/databases" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Databases" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Databases </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/dhm-cloud" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Distributed, hybrid, and multicloud" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Distributed, hybrid, and multicloud </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/generative-ai" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Generative AI" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Generative AI </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/industry" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Industry solutions" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Industry solutions </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/networking" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Networking" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Networking </span> </a> </li> <li 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class="devsite-nav-text" tooltip > Storage </span> </a> </li> </ul> <ul class="devsite-nav-list" menu="Cross-product tools" aria-label="Side menu" hidden> <li class="devsite-nav-item"> <a href="/docs/access-resources" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Access and resources management" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Access and resources management </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/costs-usage" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Costs and usage management" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Costs and usage management </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/devtools" 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track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Migration </span> </a> </li> </ul> <ul class="devsite-nav-list" menu="Related sites" aria-label="Side menu" hidden> <li class="devsite-nav-item"> <a href="/" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Google Cloud Home" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Google Cloud Home </span> </a> </li> <li class="devsite-nav-item"> <a href="/free" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Free Trial and Free Tier" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Free Trial and Free Tier </span> </a> </li> <li class="devsite-nav-item"> <a href="/architecture" class="devsite-nav-title gc-analytics-event " 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track-type="globalNav" track-name="breadcrumb" track-metadata-position="3" track-metadata-eventdetail="Cloud APIs" > Cloud APIs </a> </li> </ul> <devsite-thumb-rating position="header"> </devsite-thumb-rating> </div> <devsite-feedback position="header" project-name="Cloud APIs" product-id="5008998" bucket="Documentation" context="" version="t-devsite-webserver-20241114-r00-rc02.464922260396498922" data-label="Send Feedback Button" track-type="feedback" track-name="sendFeedbackLink" track-metadata-position="header" class="nocontent" project-icon="https://www.gstatic.com/devrel-devsite/prod/v870e399c64f7c43c99a3043db4b3a74327bb93d0914e84a0c3dba90bbfd67625/cloud/images/favicons/onecloud/super_cloud.png" > <button> Send feedback </button> </devsite-feedback> <h1 class="devsite-page-title" tabindex="-1"> System parameters </h1> <devsite-feature-tooltip ack-key="AckCollectionsBookmarkTooltipDismiss" analytics-category="Site-Wide Custom Events" analytics-action-show="Callout Profile displayed" analytics-action-close="Callout Profile dismissed" analytics-label="Create Collection Callout" class="devsite-page-bookmark-tooltip nocontent" dismiss-button="true" id="devsite-collections-dropdown" dismiss-button-text="Dismiss" close-button-text="Got it"> <devsite-bookmark></devsite-bookmark> <span slot="popout-heading"> Stay organized with collections </span> <span slot="popout-contents"> Save and categorize content based on your preferences. </span> </devsite-feature-tooltip> <div class="devsite-page-title-meta"><devsite-view-release-notes></devsite-view-release-notes></div> <devsite-toc class="devsite-nav" depth="2" devsite-toc-embedded > </devsite-toc> <div class="devsite-article-body clearfix "> <p>Google's API platform provides a set of common functionality to all Google APIs built using the platform. In order to use and control such functionality, the platform pre-defines a special set of request parameters called <em>system parameters</em>. These parameters are available across all Google REST APIs and gRPC APIs. A system parameter can be specified either using an HTTP query parameter or an HTTP header. For Google gRPC APIs, only HTTP headers are supported.</p> <p>Most users will not need to use these parameters directly. However, they are often used by Google-provided <a href="/apis/docs/client-libraries-explained">client libraries</a>. If you need to write custom code to access Google APIs directly, the system parameters can be useful in cases such as controlling JSON pretty-printing or specifying API Keys.</p> <h2 id="http_mapping" data-text="HTTP Mapping" tabindex="-1">HTTP Mapping</h2> <p>For HTTP requests, system parameters are sent as URL query parameters or HTTP request headers. For example, if you have a system parameter <code translate="no" dir="ltr">$foo</code>, it's sent as <code translate="no" dir="ltr">?$foo=xxx</code> in the URL, or <code translate="no" dir="ltr">?%24foo=xxx</code> if URL-encoded. See the table below for details.</p> <aside class="note"><strong>Note:</strong><span> The <code translate="no" dir="ltr">$</code> name prefix is added to avoid conflicting with normal request parameters.</span></aside> <h2 id="grpc_mapping" data-text="gRPC Mapping" tabindex="-1">gRPC Mapping</h2> <p>For <a href="https://grpc.io/">gRPC</a> requests, system parameters are sent as HTTP request headers with keys in lowercase. See the table below for details.</p> <h2 id="definitions" data-text="Definitions" tabindex="-1">Definitions</h2> <p>The following table lists all system parameters and their definitions.</p> <table> <thead> <tr> <th>URL Query Parameter</th> <th>HTTP/gRPC Header</th> <th>Description</th> </tr> </thead> <tbody> <tr> <td></td> <td><code translate="no" dir="ltr">Authorization</code></td> <td>Authentication credentials. See <a href="/docs/authentication">Authentication overview</a> for details.</td> </tr> <tr> <td><code translate="no" dir="ltr">$alt</code>,<br><code translate="no" dir="ltr">alt</code></td> <td></td> <td>Alternative response format. Supported values are <code translate="no" dir="ltr">json</code> (default), <code translate="no" dir="ltr">media</code>, <code translate="no" dir="ltr">proto</code>, <code translate="no" dir="ltr">sse</code> (JSON streams).</td> </tr> <tr> <td><code translate="no" dir="ltr">$.xgafv</code></td> <td></td> <td>JSON error format. Supported values are <code translate="no" dir="ltr">1</code>, <code translate="no" dir="ltr">2</code> (default). The error format <code translate="no" dir="ltr">1</code> should only be used by <a href="https://developers.google.com/api-client-library">Google API Client Libraries</a>.</td> </tr> <tr> <td><code translate="no" dir="ltr">$callback</code>,<br><code translate="no" dir="ltr">callback</code></td> <td></td> <td>JSONP callback parameter.</td> </tr> <tr> <td><code translate="no" dir="ltr">$ct</code></td> <td><code translate="no" dir="ltr">Content-Type</code></td> <td>HTTP Content-Type request header override.</td> </tr> <tr> <td><code translate="no" dir="ltr">$fields</code>,<br><code translate="no" dir="ltr">fields</code></td> <td><code translate="no" dir="ltr">X-Goog-FieldMask</code></td> <td><a href="https://github.com/protocolbuffers/protobuf/blob/master/src/google/protobuf/field_mask.proto"><code translate="no" dir="ltr">FieldMask</code></a> used for response filtering. If empty, all fields should be returned unless documented otherwise.</td> </tr> <tr> <td></td> <td><code translate="no" dir="ltr">X-HTTP-Method-Override</code></td> <td>The intended HTTP method for the request. Some network proxies don't accept all HTTP methods.</td> </tr> <tr> <td><code translate="no" dir="ltr">$key</code>,<br><code translate="no" dir="ltr">key</code></td> <td><code translate="no" dir="ltr">X-Goog-Api-Key</code></td> <td>Google API key. See https://cloud.google.com/docs/authentication/api-keys for details.</td> </tr> <tr> <td><code translate="no" dir="ltr">passwd</code>,<br><code translate="no" dir="ltr">password</code></td> <td></td> <td>Reserved to prevent putting passwords in URLs.</td> </tr> <tr> <td><code translate="no" dir="ltr">$prettyPrint</code>,<br><code translate="no" dir="ltr">prettyPrint</code></td> <td></td> <td>Pretty-print JSON response. Supported values are <code translate="no" dir="ltr">true</code> (default), <code translate="no" dir="ltr">false</code>.</td> </tr> <tr> <td><code translate="no" dir="ltr">quotaUser</code></td> <td><code translate="no" dir="ltr">X-Goog-Quota-User</code></td> <td>A pseudo user identifier for charging per-user quotas. If not specified, the authenticated principal is used. If there is no authenticated principal, the client IP address will be used. When specified, a valid API key with service restrictions must be used to identify the quota project. Otherwise, this parameter is ignored.</td> </tr> <tr> <td><code translate="no" dir="ltr">$outputDefaults</code></td> <td></td> <td>Force to output proto default values for JSON responses.</td> </tr> <tr> <td><code translate="no" dir="ltr">$unique</code></td> <td></td> <td>Unique query parameter to disable request caching.</td> </tr> <tr> <td></td> <td><code translate="no" dir="ltr">X-Goog-Api-Client</code></td> <td>API client identification. The value is a space-separated list of <code translate="no" dir="ltr">NAME "/" SEMVER</code> strings, where the <code translate="no" dir="ltr">NAME</code> should only contain lowercase letters, digits, and "-", and the <code translate="no" dir="ltr">SEMVER</code> should be a semantic version string. For example: X-Goog-Api-Client: python/3.5.0 grpc-google-pubsub-v1/0.1.0-beta2 linux/2.7.0.</td> </tr> <tr> <td></td> <td><code translate="no" dir="ltr">X-Goog-Request-Reason</code></td> <td>Contains a reason for making the request, which is intended to be recorded in audit logging. An example reason would be a support-case ticket number.</td> </tr> <tr> <td><code translate="no" dir="ltr">$userProject</code></td> <td><code translate="no" dir="ltr">X-Goog-User-Project</code></td> <td>A caller-specified project for quota and billing purposes. The caller must have <code translate="no" dir="ltr">serviceusage.services.use</code> permission on the project.</td> </tr> <tr> <td></td> <td><code translate="no" dir="ltr">X-Server-Timeout</code></td> <td>Timeout (in seconds, float value) for the server to finish processing the request. This system param only applies to REST APIs for which client-side timeout is not applicable.</td> </tr> <tr> <td></td> <td><code translate="no" dir="ltr">x-goog-request-params</code></td> <td>Passing additional parameters for gRPC requests in URL query format. For example: x-goog-request-params: service=pubsub.googleapis.com&release=2021-11-01r0.</td> </tr> </tbody> </table> <h2 id="changelog" data-text="Changelog" tabindex="-1">Changelog</h2> <ul> <li>2021-11 Published documentation for <code translate="no" dir="ltr">x-goog-request-params</code>.</li> <li>2021-02 Published documentation for <code translate="no" dir="ltr">quotaUser</code>.</li> <li>2020-07 Deprecated OAuth 2.0 query parameters.</li> <li>2019-10 Introduced <code translate="no" dir="ltr">X-Server-Timeout</code> system parameter.</li> <li>2017-10 Introduced <code translate="no" dir="ltr">X-Goog-User-Project</code> system parameter.</li> </ul> <devsite-hats-survey class="nocontent" hats-id="mwETRvWii0eU5NUYprb0Y9z5GVbc" listnr-id="83405"></devsite-hats-survey> </div> <devsite-thumb-rating position="footer"> </devsite-thumb-rating> <devsite-feedback position="footer" project-name="Cloud APIs" product-id="5008998" bucket="Documentation" context="" version="t-devsite-webserver-20241114-r00-rc02.464922260396498922" data-label="Send Feedback Button" track-type="feedback" track-name="sendFeedbackLink" track-metadata-position="footer" class="nocontent" project-icon="https://www.gstatic.com/devrel-devsite/prod/v870e399c64f7c43c99a3043db4b3a74327bb93d0914e84a0c3dba90bbfd67625/cloud/images/favicons/onecloud/super_cloud.png" > <button> Send feedback </button> </devsite-feedback> <div class="devsite-floating-action-buttons"> </div> </article> <devsite-content-footer class="nocontent"> <p>Except as otherwise noted, the content of this page is licensed under the <a href="https://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution 4.0 License</a>, and code samples are licensed under the <a href="https://www.apache.org/licenses/LICENSE-2.0">Apache 2.0 License</a>. 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