Cloud CDN の概要 | Google Cloud

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- related-sites" track-metadata-module="tertiary nav" tooltip > <div class="devsite-nav-item-title"> Google Cloud サポート </div> </a> </li> <li class="devsite-nav-item"> <a href="https://www.youtube.com/@googlecloudtech?hl=ja" track-type="nav" track-metadata-eventdetail="https://www.youtube.com/@googlecloudtech?hl=ja" track-metadata-position="nav - related-sites" track-metadata-module="tertiary nav" tooltip > <div class="devsite-nav-item-title"> YouTube の Google Cloud Tech チャンネル </div> </a> </li> </ul> </div> </div> </div> </tab> </nav> </cloudx-tabs-nav> </div> <devsite-search enable-signin enable-search enable-suggestions project-name="Cloud CDN" tenant-name="Google Cloud" project-scope="/cdn/docs" url-scoped="https://cloud.google.com/s/results/cdn/docs?hl=ja" > <form class="devsite-search-form" action="https://cloud.google.com/s/results?hl=ja" method="GET"> <div class="devsite-search-container"> <button type="button" search-open class="devsite-search-button devsite-header-icon-button 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>Español – América Latina</a> </li> <li role="presentation"> <a role="menuitem" lang="fr" >Français</a> </li> <li role="presentation"> <a role="menuitem" lang="id" >Indonesia</a> </li> <li role="presentation"> <a role="menuitem" lang="it" >Italiano</a> </li> <li role="presentation"> <a role="menuitem" lang="pt_br" >Português – Brasil</a> </li> <li role="presentation"> <a role="menuitem" lang="zh_cn" >中文 – 简体</a> </li> <li role="presentation"> <a role="menuitem" lang="ja" >日本語</a> </li> <li role="presentation"> <a role="menuitem" lang="ko" >한국어</a> </li> </ul> </devsite-language-selector> <a class="devsite-header-link devsite-top-button button gc-analytics-event " href="//console.cloud.google.com/?hl=ja" data-category="Site-Wide Custom Events" data-label="Site header link: コンソール" track-name="console" track-metadata-position="nav" referrerpolicy="no-referrer-when-downgrade" track-type="globalNav" track-metadata-eventDetail="nav" > コンソール </a> <devsite-user enable-profiles fp-auth id="devsite-user"> <span class="button devsite-top-button" aria-hidden="true" visually-hidden>ログイン</span> </devsite-user> </div> </div> </div> <div class="devsite-collapsible-section "> <div class="devsite-header-background"> <div class="devsite-product-id-row" hidden> <div class="devsite-product-description-row"> </div> </div> <div class="devsite-doc-set-nav-row"> <ul class="devsite-breadcrumb-list" > <li class="devsite-breadcrumb-item "> <a href="https://cloud.google.com/cdn?hl=ja" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Lower Header" data-value="1" track-type="globalNav" track-name="breadcrumb" track-metadata-position="1" track-metadata-eventdetail="Cloud CDN" > Cloud CDN </a> </li> </ul> <cloudx-tabs-nav class="lower-tabs"> <nav class="devsite-tabs-wrapper" aria-label="下部のタブ"> <tab > <a href="https://cloud.google.com/cdn/docs?hl=ja" class="devsite-tabs-content gc-analytics-event " track-metadata-eventdetail="https://cloud.google.com/cdn/docs?hl=ja" track-type="nav" track-metadata-position="nav - 概要" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: 概要" track-name="概要" > 概要 </a> </tab> <tab class="devsite-active"> <a href="https://cloud.google.com/cdn/docs/overview?hl=ja" class="devsite-tabs-content gc-analytics-event " track-metadata-eventdetail="https://cloud.google.com/cdn/docs/overview?hl=ja" track-type="nav" track-metadata-position="nav - ガイド" track-metadata-module="primary nav" aria-label="ガイド, selected" data-category="Site-Wide Custom Events" data-label="Tab: ガイド" track-name="ガイド" > ガイド </a> </tab> <tab > <a href="https://cloud.google.com/cdn/docs/apis?hl=ja" class="devsite-tabs-content gc-analytics-event " track-metadata-eventdetail="https://cloud.google.com/cdn/docs/apis?hl=ja" track-type="nav" track-metadata-position="nav - リファレンス" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: リファレンス" track-name="リファレンス" > リファレンス </a> </tab> <tab > <a href="https://cloud.google.com/cdn/docs/resources?hl=ja" class="devsite-tabs-content gc-analytics-event " track-metadata-eventdetail="https://cloud.google.com/cdn/docs/resources?hl=ja" track-type="nav" track-metadata-position="nav - リソース" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: リソース" track-name="リソース" > リソース </a> </tab> </nav> </cloudx-tabs-nav> <div class="devsite-product-button-row"> <a href="https://cloud.google.com/contact?hl=ja" class="cta-button-secondary button " track-metadata-position="nav" track-metadata-eventDetail="nav" data-overflow-container="left" track-type="contact" data-overflow-wrapper="tab" track-name="sales" data-overflow="devsite-tabs-wrapper" >お問い合わせ</a> <a href="//console.cloud.google.com/freetrial?hl=ja" class="cloud-free-trial-button cta-button-primary button-primary button cloud-button cloud-button--primary " data-overflow="devsite-top-logo-row" track-type="freeTrial" track-name="gcpCta" track-metadata-eventDetail="nav" 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" referrerpolicy="no-referrer-when-downgrade" data-overflow-container="right" >無料で利用開始</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="フィルタ" aria-label="フィルタテキストを入力" role="searchbox"> <span class="filter-clear-button hidden" data-title="フィルタをクリア" aria-label="フィルタをクリア" role="button" tabindex="0"></span> </div> <nav class="devsite-book-nav devsite-nav nocontent" aria-label="サイドメニュー"> <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="ナビゲーションを閉じる"> </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/v17c4f87be230ffee20589ee6dca0a2318ead9eddb228ec5c58233202ff69a933/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-active" data-category="Site-Wide Custom Events" data-label="Tab: ドキュメント" track-name="docs-home" track-link-column-type="single-column" data-category="Site-Wide Custom Events" data-label="Responsive Tab: ドキュメント" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > ドキュメント </span> </a> <ul class="devsite-nav-responsive-tabs"> <li class="devsite-nav-item"> <a href="/cdn/docs" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: 概要" track-name="概要" data-category="Site-Wide Custom Events" data-label="Responsive Tab: 概要" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > 概要 </span> </a> </li> <li class="devsite-nav-item"> <a href="/cdn/docs/overview" class="devsite-nav-title gc-analytics-event devsite-nav-has-children devsite-nav-active" data-category="Site-Wide Custom Events" data-label="Tab: ガイド" track-name="ガイド" data-category="Site-Wide Custom Events" data-label="Responsive Tab: ガイド" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip menu="_book"> ガイド </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="_book"> </span> </a> </li> <li class="devsite-nav-item"> <a href="/cdn/docs/apis" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: リファレンス" track-name="リファレンス" data-category="Site-Wide Custom Events" data-label="Responsive Tab: リファレンス" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > リファレンス </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/cdn/docs/resources" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: リソース" track-name="リソース" data-category="Site-Wide Custom Events" data-label="Responsive Tab: リソース" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > リソース </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> </ul> </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: テクノロジー分野" track-name="technology-areas" track-link-column-type="single-column" data-category="Site-Wide Custom Events" data-label="Responsive Tab: テクノロジー分野" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > テクノロジー分野 </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: テクノロジー分野" track-name="technology-areas" track-link-column-type="single-column" > <span class="devsite-nav-text" tooltip menu="テクノロジー分野"> その他 </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="テクノロジー分野"> </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: プロダクト横断型のツール" track-name="crossproduct" track-link-column-type="single-column" data-category="Site-Wide Custom Events" data-label="Responsive Tab: プロダクト横断型のツール" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > プロダクト横断型のツール </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: プロダクト横断型のツール" track-name="crossproduct" track-link-column-type="single-column" > <span class="devsite-nav-text" tooltip menu="プロダクト横断型のツール"> その他 </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="プロダクト横断型のツール"> </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: 関連サイト" track-name="related-sites" track-link-column-type="single-column" data-category="Site-Wide Custom Events" data-label="Responsive Tab: 関連サイト" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > 関連サイト </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: 関連サイト" track-name="related-sites" track-link-column-type="single-column" > <span class="devsite-nav-text" tooltip menu="関連サイト"> その他 </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="関連サイト"> </span> </span> </li> </ul> </li> <li class="devsite-nav-item"> <a href="//console.cloud.google.com/" class="devsite-nav-title gc-analytics-event " track-name="console" track-metadata-position="nav" referrerpolicy="no-referrer-when-downgrade" track-type="globalNav" track-metadata-eventDetail="nav" data-category="Site-Wide Custom Events" data-label="Responsive Tab: コンソール" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > コンソール </span> </a> </li> <li class="devsite-nav-item"> <a href="/contact" class="cta-button-secondary button" track-metadata-position="nav" track-metadata-eventDetail="nav" data-overflow-container="left" track-type="contact" data-overflow-wrapper="tab" track-name="sales" data-overflow="devsite-tabs-wrapper" data-category="Site-Wide Custom Events" data-label="Responsive Tab: お問い合わせ" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > お問い合わせ </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" data-overflow="devsite-top-logo-row" track-type="freeTrial" track-name="gcpCta" track-metadata-eventDetail="nav" 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" referrerpolicy="no-referrer-when-downgrade" data-overflow-container="right" data-category="Site-Wide Custom Events" data-label="Responsive Tab: 無料で利用開始" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > 無料で利用開始 </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>Discover</span> </div></li> <li class="devsite-nav-item"><a href="/cdn/docs/overview" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/overview" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/overview" ><span class="devsite-nav-text" tooltip>サービスの概要</span></a></li> <li class="devsite-nav-item"><a href="/cdn/docs/choose-cdn-product" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/choose-cdn-product" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/choose-cdn-product" ><span class="devsite-nav-text" tooltip>CDN プロダクトを選択する</span></a></li> <li class="devsite-nav-item"><a href="/cdn/docs/best-practices" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/best-practices" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/best-practices" ><span class="devsite-nav-text" tooltip>おすすめの方法</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>始める</span> </div></li> <li class="devsite-nav-item"><a href="/cdn/docs/quickstart-backend-bucket-console" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/quickstart-backend-bucket-console" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/quickstart-backend-bucket-console" ><span class="devsite-nav-text" tooltip>バックエンドバケットを送信元として設定する</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>設定</span> </div></li> <li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Cloud CDN を設定する</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/cdn/docs/using-cdn" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/using-cdn" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/using-cdn" ><span class="devsite-nav-text" tooltip>概要</span></a></li><li class="devsite-nav-item"><a href="/cdn/docs/setting-up-cdn-with-mig" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/setting-up-cdn-with-mig" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/setting-up-cdn-with-mig" ><span class="devsite-nav-text" tooltip>マネージドインスタンスグループのバックエンドの設定</span></a></li><li class="devsite-nav-item"><a href="/cdn/docs/setting-up-cdn-with-bucket" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/setting-up-cdn-with-bucket" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/setting-up-cdn-with-bucket" ><span class="devsite-nav-text" tooltip>Cloud Storage バックエンドバケットの設定</span></a></li><li class="devsite-nav-item"><a href="/cdn/docs/setting-up-cdn-with-serverless" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/setting-up-cdn-with-serverless" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/setting-up-cdn-with-serverless" ><span class="devsite-nav-text" tooltip>Cloud Run、Cloud Functions、App Engine の設定</span></a></li><li class="devsite-nav-item"><a href="/cdn/docs/setting-up-cdn-with-third-party-storage" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/setting-up-cdn-with-third-party-storage" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/setting-up-cdn-with-third-party-storage" ><span class="devsite-nav-text" tooltip>サードパーティのオブジェクトストレージの設定</span></a></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>外部バックエンドの使用</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/cdn/docs/external-backends-internet-neg-overview" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/external-backends-internet-neg-overview" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/external-backends-internet-neg-overview" ><span class="devsite-nav-text" tooltip>概要</span></a></li><li class="devsite-nav-item"><a href="/cdn/docs/set-up-external-backend-internet-neg" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/set-up-external-backend-internet-neg" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/set-up-external-backend-internet-neg" ><span class="devsite-nav-text" tooltip>インターネット NEG を使用して外部バックエンドを設定する</span></a></li></ul></div></li></ul></div></li> <li class="devsite-nav-item"><a href="/cdn/docs/cdn-terraform-examples" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/cdn-terraform-examples" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/cdn-terraform-examples" ><span class="devsite-nav-text" tooltip>Terraform を使用して Cloud CDN の設定を自動化する</span></a></li> <li class="devsite-nav-item"><a href="/cdn/docs/setting-up-http-https-redirect" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/setting-up-http-https-redirect" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/setting-up-http-https-redirect" ><span class="devsite-nav-text" tooltip>HTTP リクエストを HTTPS にリダイレクトする</span></a></li> <li class="devsite-nav-item"><a href="/cdn/docs/http-https-over-same-domain" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/http-https-over-same-domain" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/http-https-over-same-domain" ><span class="devsite-nav-text" tooltip>保護されたコンテンツと保護されていないコンテンツを同じホスト名で配信する</span></a></li> <li class="devsite-nav-item"><a href="/cdn/docs/dynamic-compression" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/dynamic-compression" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/dynamic-compression" ><span class="devsite-nav-text" tooltip>動的圧縮を有効にする</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>コンテンツのキャッシュ保存</span> </div></li> <li class="devsite-nav-item"><a href="/cdn/docs/caching" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/caching" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/caching" ><span class="devsite-nav-text" tooltip>概要</span></a></li> <li class="devsite-nav-item"><a href="/cdn/docs/using-cache-modes" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/using-cache-modes" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/using-cache-modes" ><span class="devsite-nav-text" tooltip>キャッシュモードの変更</span></a></li> <li class="devsite-nav-item"><a href="/cdn/docs/using-cache-keys" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/using-cache-keys" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/using-cache-keys" ><span class="devsite-nav-text" tooltip>キャッシュキーのカスタマイズ</span></a></li> <li class="devsite-nav-item"><a href="/cdn/docs/using-negative-caching" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/using-negative-caching" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/using-negative-caching" ><span class="devsite-nav-text" tooltip>ネガティブキャッシュの使用</span></a></li> <li class="devsite-nav-item"><a href="/cdn/docs/using-ttl-overrides" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/using-ttl-overrides" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/using-ttl-overrides" ><span class="devsite-nav-text" tooltip>TTL の設定とオーバーライドの変更</span></a></li> <li class="devsite-nav-item"><a href="/cdn/docs/serving-stale-content" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/serving-stale-content" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/serving-stale-content" ><span class="devsite-nav-text" tooltip>古いコンテンツを配信する</span></a></li> <li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>キャッシュの無効化</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/cdn/docs/cache-invalidation-overview" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/cache-invalidation-overview" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/cache-invalidation-overview" ><span class="devsite-nav-text" tooltip>概要</span></a></li><li class="devsite-nav-item"><a href="/cdn/docs/invalidating-cached-content" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/invalidating-cached-content" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/invalidating-cached-content" ><span class="devsite-nav-text" tooltip>キャッシュに保存されたコンテンツを無効にする</span></a></li></ul></div></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>アクセスを保護および制御する</span> </div></li> <li class="devsite-nav-item"><a href="/cdn/docs/authenticate-content" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/authenticate-content" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/authenticate-content" ><span class="devsite-nav-text" tooltip>コンテンツを認証する</span></a></li> <li class="devsite-nav-item"><a href="/cdn/docs/using-signed-urls" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/using-signed-urls" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/using-signed-urls" ><span class="devsite-nav-text" tooltip>署名付き URL を使用する</span></a></li> <li class="devsite-nav-item"><a href="/cdn/docs/using-signed-cookies" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/using-signed-cookies" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/using-signed-cookies" ><span class="devsite-nav-text" tooltip>署名付き Cookie を使用する</span></a></li> <li class="devsite-nav-item"><a href="/cdn/docs/configure-private-origin-authentication" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/configure-private-origin-authentication" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/configure-private-origin-authentication" ><span class="devsite-nav-text" tooltip>非公開送信元の認証を構成する</span></a></li> <li class="devsite-nav-item"><a href="/cdn/docs/web-security-best-practices" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/web-security-best-practices" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/web-security-best-practices" ><span class="devsite-nav-text" tooltip>ウェブセキュリティのベストプラクティス</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>モニタリング</span> </div></li> <li class="devsite-nav-item"><a href="/cdn/docs/cdn-logging-monitoring" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/cdn-logging-monitoring" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/cdn-logging-monitoring" ><span class="devsite-nav-text" tooltip>バックエンドサービスのログと指標</span></a></li> <li class="devsite-nav-item"><a href="/cdn/docs/logging" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/logging" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/logging" ><span class="devsite-nav-text" tooltip>キャッシュのログと指標</span></a></li> <li class="devsite-nav-item"><a href="/cdn/docs/audit-logging" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/audit-logging" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/audit-logging" ><span class="devsite-nav-text" tooltip>監査ロギングの情報</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>トラブルシューティング</span> </div></li> <li class="devsite-nav-item"><a href="/cdn/docs/troubleshooting-steps" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /cdn/docs/troubleshooting-steps" track-type="bookNav" track-name="click" track-metadata-eventdetail="/cdn/docs/troubleshooting-steps" ><span class="devsite-nav-text" tooltip>トラブルシューティング</span></a></li> </ul> <ul class="devsite-nav-list" menu="テクノロジー分野" aria-label="サイドメニュー" 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 と ML" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > AI と 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: アプリケーション開発" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > アプリケーション開発 </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: アプリケーションのホスティング" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > アプリケーションのホスティング </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: コンピューティング" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > コンピューティング </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: データ分析とパイプライン" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > データ分析とパイプライン </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: データベース" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > データベース </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: 分散型クラウド、ハイブリッドクラウド、マルチクラウド" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > 分散型クラウド、ハイブリッドクラウド、マルチクラウド </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: 生成 AI" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > 生成 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: 業種別ソリューション" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > 業種別ソリューション </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: ネットワーキング" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > ネットワーキング </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/observability" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: オブザーバビリティとモニタリング" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > オブザーバビリティとモニタリング </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/security" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: セキュリティ" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > セキュリティ </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/storage" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Storage" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Storage </span> </a> </li> </ul> <ul class="devsite-nav-list" menu="プロダクト横断型のツール" aria-label="サイドメニュー" 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: アクセスとリソースの管理" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > アクセスとリソースの管理 </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: 費用と使用量の管理" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> 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<devsite-bookmark></devsite-bookmark> <span slot="popout-heading"> コレクションでコンテンツを整理 </span> <span slot="popout-contents"> 必要に応じて、コンテンツの保存と分類を行います。 </span> </devsite-feature-tooltip> </div> </h1> <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>Cloud CDN（コンテンツ配信ネットワーク）は、Google のグローバルエッジネットワークを使用して、ユーザーの近くからコンテンツを配信します。これにより、ウェブサイトとアプリケーションが高速化されます。</p> <p>Cloud CDN は、<a href="https://cloud.google.com/load-balancing/docs/https?hl=ja">グローバル外部アプリケーションロードバランサおよび従来のグローバル外部アプリケーションロードバランサ</a>と連携して、ユーザーにコンテンツを配信します。外部アプリケーションロードバランサが、リクエストを受信するフロントエンド IP アドレスとポート、そしてリクエストに応答するバックエンドを提供します。</p> <p>Cloud CDN コンテンツは、次のように<a href="https://cloud.google.com/load-balancing/docs/https?hl=ja#backend-service">さまざまな種類のバックエンド</a>から提供されます。</p> <p>Cloud CDN では、こうしたバックエンドが「送信元サーバー」とも呼ばれます。<em></em>図 1 は、仮想マシン（VM）インスタンス上で稼働する送信元サーバーからのレスポンスがどのように外部アプリケーションロードバランサを通過して Cloud CDN によって配信されるかを示しています。この状況では、<a href="https://cloud.google.com/docs/security/infrastructure/design?hl=ja#google_front_end_service">Google Front End（GFE）</a>は Cloud CDN と外部アプリケーションロードバランサで構成されます。</p> <figure style="text-align: center"> <img alt="図 1. 送信元サーバーから Cloud CDN を通過してクライアントに送信されるレスポンスのフロー" src="https://cloud.google.com/static/cdn/images/cdn-response-flow.svg?hl=ja" /> <figcaption><b>図 1.</b> 送信元サーバーから Cloud CDN を通過してクライアントに送信されるレスポンスのフロー</figcaption> </figure> <h2 data-text="Cloud CDN の仕組み" id="how-cdn-works" tabindex="-1">Cloud CDN の仕組み</h2> <p>ユーザーが外部アプリケーションロードバランサに対してコンテンツをリクエストすると、そのリクエストは、Google のネットワークのエッジの中でユーザーに最も近いエッジにある GFE に到着します。</p> <p>ロードバランサの URL マップが Cloud CDN が構成されたバックエンドサービスまたはバックエンドバケットにトラフィックをルーティングする場合、GFE は Cloud CDN を使用します。</p> <h3 data-text="キャッシュヒットとキャッシュミス" id="cache_hits_and_cache_misses" tabindex="-1">キャッシュヒットとキャッシュミス</h3> <p>キャッシュは、コンテンツを保存および管理するサーバーのグループであり、対象コンテンツに対する将来のリクエストを高速で処理できるようにします。キャッシュに保存されたコンテンツは、送信元サーバーに保存されているキャッシュ可能なコンテンツのコピーです。</p> <p>GFE は Cloud CDN のキャッシュを検索し、ユーザーのリクエストに対するレスポンスを見つけると、キャッシュに保存されているそのレスポンスをユーザーに送信します。これは「キャッシュヒット」と呼ばれます<em></em>。キャッシュヒットが発生すると、GFE がその<a href="https://cloud.google.com/cdn/docs/caching?hl=ja#cache-keys">キャッシュキー</a>を基準にコンテンツを検索してユーザーにレスポンスを直接返すので、ラウンドトリップ時間が短くなり、配信元サーバーがリクエストを処理する必要もなくなります。</p> <p>部分ヒット<em></em>は、リクエストの一部分がキャッシュから、一部分がバックエンドから配信された場合に発生します。これは、<a href="https://cloud.google.com/cdn/docs/caching?hl=ja#byte-range-requests">バイト範囲リクエストのサポート</a>で説明しているように、リクエストされたコンテンツの一部のみが Cloud CDN キャッシュに保存されている場合に発生することがあります。</p> <p>コンテンツが初めてリクエストされたとき、GFE はキャッシュからリクエストを処理できないと判断します。これは「キャッシュミス」と呼ばれます。キャッシュミスが発生すると、GFE はリクエストを外部アプリケーションロードバランサに転送します。<em></em>その後、ロードバランサはいずれかの送信元サーバーにリクエストを転送します。キャッシュで受信されたコンテンツは、GFE によってユーザーに転送されます。</p> <p>このリクエストに対する配信元サーバーのレスポンスが<a href="https://cloud.google.com/cdn/docs/caching?hl=ja#cacheability">キャッシュ可能</a>な場合、Cloud CDN は以降のリクエストに備えてレスポンスを Cloud CDN キャッシュに保存します。キャッシュからクライアントへのデータ転送を「キャッシュ下り（外向き）」といいます。<em></em>キャッシュへのデータ転送を「キャッシュフィル」といいます。<em></em></p> <p>図 2 は、キャッシュヒットとキャッシュミスを示しています。</p> <ol> <li>VM インスタンス上で稼働している送信元サーバーが HTTP(S) レスポンスを送信します。</li> <li>外部アプリケーションロードバランサがレスポンスを Cloud CDN に配信します。</li> <li>Cloud CDN がレスポンスをエンドユーザーに配信します。</li> </ol> <figure style="text-align: center"> <img alt="図 2. 最初のレスポンスは送信元サーバーから提供されますが、以降のレスポンスは GFE によってキャッシュから提供されます。" src="https://cloud.google.com/static/cdn/images/cache-hit.svg?hl=ja" /> <figcaption><b>図 2</b> 最初のレスポンスは送信元サーバーから配信されますが、以降のレスポンスは GFE によってキャッシュから配信されます。</figcaption></figure> <p>キャッシュヒットとキャッシュミスに関連する費用については、<a href="https://cloud.google.com/cdn/pricing?hl=ja">料金</a>をご覧ください。</p> <h3 data-text="キャッシュヒット率" id="cache_hit_ratio" tabindex="-1">キャッシュヒット率</h3> <p>「キャッシュヒット率」とは<em></em>、リクエストされたオブジェクトがキャッシュから提供される回数の割合です。キャッシュヒット率が 60% の場合、リクエストされたオブジェクトがキャッシュから 60% の割合で提供され、送信元から 40% の割合で取得する必要があります。</p> <p>キャッシュキーがキャッシュヒット率に与える影響については、<a href="https://cloud.google.com/cdn/docs/using-cache-keys?hl=ja">キャッシュキーの使用</a>をご覧ください。トラブルシューティング情報については、<a href="https://cloud.google.com/cdn/docs/troubleshooting-steps?hl=ja#low-hit-rate">キャッシュヒット率が低い</a>をご覧ください。</p> <h4 data-text="短期間のキャッシュヒット率を表示する" id="view_the_cache_hit_ratio_for_a_small_time_period" tabindex="-1">短期間のキャッシュヒット率を表示する</h4> <p>短期間（最後の数分）のキャッシュヒット率を表示するには:</p> <ol> <li><p>Google Cloud Console で、[<strong>Cloud CDN</strong>] ページに移動します。</p><p><a class="button button-primary" href="https://console.cloud.google.com/networking/cdn/list?hl=ja" target="console">Cloud CDN に移動</a></p><p></p></li> <li><p>それぞれの送信元について、<strong>キャッシュヒット率</strong>列を確認します。</p> <p><strong>n/a</strong> は、負荷分散されたコンテンツがキャッシュ内に存在しないか、最近リクエストされていないことを意味します。</p></li> </ol> <h4 data-text="長期間のキャッシュヒット率を表示する" id="view_the_cache_hit_ratio_for_a_longer_time_period" tabindex="-1">長期間のキャッシュヒット率を表示する</h4> <p>1 時間から 30 日間のキャッシュヒット率を表示するには:</p> <ol> <li>Google Cloud Console で、[<strong>Cloud CDN</strong>] ページに移動します。<p><a class="button button-primary" href="https://console.cloud.google.com/networking/cdn/list?hl=ja" target="console">Cloud CDN に移動</a></p></li> <li>[<strong>オリジンの名前</strong>] 列で、送信元の名前をクリックします。</li> <li>[<strong>モニタリング</strong>] タブをクリックします。</li> <li>省略可: 特定のバックエンドを選択します。</li> </ol> <p>CDN のヒット率は、使用可能なモニタリンググラフの 1 つです。グラフに [<strong>なし</strong>] と表示される場合は、コンテンツがキャッシュされていないか、表示期間にリクエストがなかったことを意味します。</p> <p>別の期間を選択して期間を調整できます。次の図は選択できる期間の例を示しています。</p> <p><img alt="使用可能な期間の例を示しています" src="https://cloud.google.com/static/cdn/images/time-buttons.png?hl=ja" /></p> <h3 data-text="キャッシュへのコンテンツの挿入" id="inserting-into-cache" tabindex="-1">キャッシュへのコンテンツの挿入</h3> <p>あるオブジェクトが特定のキャッシュに保存されるのは、リクエストがそのキャッシュを通過し、しかもそのリクエストに対するレスポンスがキャッシュ可能な場合だけです。つまりキャッシュへの保存は事後対応型の操作です。キャッシュに保存されたオブジェクトが他のキャッシュに自動的に複製されることはありません。キャッシュフィルは、クライアントが開始したリクエストに応じて実行されます。キャッシュに事前に読み込むには、個々のキャッシュでリクエストに応答するしか方法はありません。</p> <p>送信元サーバーが<a href="https://cloud.google.com/cdn/docs/caching?hl=ja#byte-range-requests">バイト範囲リクエスト</a>をサポートしている場合は、Cloud CDN が単一のクライアントリクエストに対して複数のキャッシュフィルリクエストを開始することがあります。</p> <h3 data-text="キャッシュからのコンテンツの配信" id="serving-from-cache" tabindex="-1">キャッシュからのコンテンツの配信</h3> <p>Cloud CDN を有効にすると、キャッシュ可能なすべてのコンテンツが自動的にキャッシュに保存されます。送信元サーバーは HTTP ヘッダーを使用して、どのレスポンスをキャッシュに保存するかを指示します。また、<a href="https://cloud.google.com/cdn/docs/caching?hl=ja#cache-modes">キャッシュモード</a>を使用してキャッシュへの保存を制御することもできます。</p> <p>バックエンドバケットを使用する場合の送信元サーバーは Cloud Storage です。VM インスタンスを使用する場合の送信元サーバーは、それらのインスタンスで実行しているウェブサーバーソフトウェアです。</p> <p>Cloud CDN は、世界各地のロケーションにあるキャッシュを使用します。キャッシュの特性上、特定のリクエストに対するレスポンスがキャッシュから返されるかどうかを予測することはできません。ただし、キャッシュ可能なコンテンツに対するリクエストが多い場合、通常はそのリクエストに対するレスポンスがキャッシュから返されるはずなので、レイテンシの大幅な短縮、コストの削減、送信元サーバーの負荷の軽減が期待されます。</p> <p>Cloud CDN がキャッシュに保存するコンテンツと保存期間について詳しくは、<a href="https://cloud.google.com/cdn/docs/caching?hl=ja">キャッシュの概要</a>をご覧ください。</p> <p>Cloud CDN がキャッシュから配信している内容を確認するには、<a href="https://cloud.google.com/cdn/docs/logging?hl=ja">ログを表示</a>します。</p> <h3 data-text="キャッシュからコンテンツを削除する" id="removing_content_from_the_cache" tabindex="-1">キャッシュからコンテンツを削除する</h3> <p>キャッシュからアイテムを削除するには、キャッシュに保存されたコンテンツを無効にします。詳細については、次の情報をご覧ください。</p> <ul> <li><a href="https://cloud.google.com/cdn/docs/cache-invalidation-overview?hl=ja">キャッシュ無効化の概要</a></li> <li><a href="https://cloud.google.com/cdn/docs/invalidating-cached-content?hl=ja">キャッシュに保存されたコンテンツの無効化</a></li> </ul> <h3 data-text="キャッシュバイパス" id="cache_bypass" tabindex="-1">キャッシュバイパス</h3> <p>Cloud CDN をバイパスするには、Cloud Storage バケットまたは Compute Engine VM に対してオブジェクトを直接リクエストします。たとえば、Cloud Storage バケットオブジェクトの URL は次のようになります。</p> <div></div><devsite-code><pre translate="no" dir="ltr" is-upgraded> https://storage.googleapis.com/<var translate="no">STORAGE_BUCKET</var>/<var translate="no">FILENAME</var> </pre></devsite-code> <h3 data-text="エビクションと有効期限" id="eviction_and_expiration" tabindex="-1">エビクションと有効期限</h3> <p>コンテンツをキャッシュから配信するには、コンテンツをキャッシュに保存し、コンテンツの削除や期限切れを防ぐ必要があります。</p> <p>エビクションと有効期限は異なるコンセプトです。<em></em><em></em>このどちらも、何が配信されるかに影響を与えますが、相互に直接影響を与えることはありません。</p> <h4 data-text="エビクション" id="eviction" tabindex="-1">エビクション</h4> <p>少数のリクエストでコンテンツキャッシュをテストすると、コンテンツが排除される可能性があります。</p> <p>各キャッシュに保存されるコンテンツの量には上限があります。ただし Cloud CDN は、キャッシュがいっぱいになった後もコンテンツを追加します。保存量の上限に達しているキャッシュにコンテンツを挿入するには、まずスペース確保のために他のいずれかのコンテンツが削除されます。この処理はエビクションと呼ばれます。キャッシュはいっぱいになることが多いので、コンテンツのエビクションも常に行われます。通常、コンテンツの有効期限に関係なく、最近アクセスされていないコンテンツが削除されます。削除されるコンテンツは期限切れの場合もあれば、そうでない場合もあります。有効期限を設定してもエビクションに影響はありません。</p> <p>人気のないコンテンツ<em></em>とは、しばらくアクセスされていないコンテンツのことです。「しばらく」と「人気のない」は、どちらもキャッシュ内の他のアイテムと比較した場合の相対的な基準です。<em></em><em></em>複数の Google Cloud プロジェクトはキャッシュスペースの共通のプールを共有します。これらのプロジェクトが同じ GFE のセットから提供されるためです。コンテンツの相対的な人気は単一のプロジェクト内でなく、複数のプロジェクト間で比較されます。</p> <p>キャッシュに送信されるトラフィックが増加すると、エビクションで削除されるコンテンツも増加します。</p> <p>サイズの大きなキャッシュの場合と同様に、コンテンツのエビクションは予測不能であり、リクエストがキャッシュから提供される保証はありません。</p> <h4 data-text="有効期限" id="expiration" tabindex="-1">有効期限</h4> <p>HTTP(S) キャッシュ内のコンテンツの有効期限を設定できます。有効期限により、エビクションでまだ削除されていないとしても、古いコンテンツはキャッシュから提供されなくなります。</p> <p>たとえば、撮影されて 1 時間以内の写真を保存する URL の場合、レスポンスの有効期限を 1 時間以内に設定します。こうしないと、古い写真がキャッシュから提供される可能性があります。</p> <p>有効期限の微調整については、<a href="https://cloud.google.com/cdn/docs/using-ttl-overrides?hl=ja">TTL の設定とオーバーライドの使用</a>をご覧ください。</p> <h2 data-text="Cloud CDN によって作成されるリクエスト" id="cdn-requests" tabindex="-1">Cloud CDN によって作成されるリクエスト</h2> <p>送信元サーバーがバイト範囲リクエストをサポートしている場合、単一のクライアントリクエストに対して Cloud CDN から複数のリクエストが送信元サーバーに送信されることがあります。<a href="https://cloud.google.com/cdn/docs/caching?hl=ja#byte-range-requests">バイト範囲リクエストのサポート</a>で説明しているように、Cloud CDN が開始できるリクエストには検証リクエストとバイト範囲リクエストの 2 種類があります。</p> <h2 data-text="他の Cloud Platform サービスのデータロケーションの設定" id="data-location" tabindex="-1">他の Cloud Platform サービスのデータロケーションの設定</h2> <p>Cloud CDN を使用すると、送信元サーバーのリージョンやゾーンとは別のロケーションにデータが保存される可能性があります。これは正常な状態であり、HTTP キャッシュはこのようにしてインターネット上で機能します。Google Cloud Platform 利用規約の<a href="https://cloud.google.com/terms/service-terms?hl=ja">サービス固有の規約</a>により、他の Google プロダクトやサービス（この場合は Cloud CDN サービス）と併用される場合、特定の Cloud Platform サービスで使用可能なデータロケーションの設定は、それぞれの Cloud Platform サービスの主なお客様データに適用されません。この条件に承諾できない場合には、Cloud CDN サービスをご利用にならないでください。</p> <h2 data-text="Google マネージド SSL 証明書のサポート" id="support_for_google-managed_ssl_certificates" tabindex="-1">Google マネージド SSL 証明書のサポート</h2> <p>Cloud CDN が有効になっている場合は、<a href="https://cloud.google.com/load-balancing/docs/ssl-certificates/google-managed-certs?hl=ja">Google マネージド証明書</a>を使用できます。</p> <h2 data-text="Google Cloud Armor と Cloud CDN" id="google-cloud-armor" tabindex="-1">Google Cloud Armor と Cloud CDN</h2> <p>Cloud CDN と Google Cloud Armor には次の 2 種類のセキュリティポリシーがあります。</p> <ul> <li><strong>エッジセキュリティポリシー</strong>。これらのポリシーは、Cloud CDN 対応の送信元サーバーに適用できます。これは、CDN ルックアップの前にすべてのトラフィックに適用されます。</li> <li><strong>バックエンドセキュリティポリシー</strong>。これらのポリシーは、動的コンテンツやキャッシュミスに対するリクエスト、または送信元サーバーを宛先とするその他のリクエストにのみ適用されます。</li> </ul> <p>詳細については、<a 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