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Check cross-browser support before using."> <span class="visually-hidden">非標準</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">非推奨;</span> </abbr></li><li><a href="/ja/docs/Web/API/FetchEvent/preloadResponse"><code>preloadResponse</code></a></li><li><a href="/ja/docs/Web/API/FetchEvent/replacesClientId"><code>replacesClientId</code></a></li><li><a href="/ja/docs/Web/API/FetchEvent/request"><code>request</code></a></li><li><a href="/ja/docs/Web/API/FetchEvent/resultingClientId"><code>resultingClientId</code></a></li></ol></details></li><li class="toggle"><details open=""><summary>インスタンスメソッド</summary><ol><li><a href="/ja/docs/Web/API/FetchEvent/respondWith"><code>respondWith()</code></a></li></ol></details></li><li class="toggle"><details open=""><summary>継承</summary><ol><li><a href="/ja/docs/Web/API/ExtendableEvent"><code>ExtendableEvent</code></a></li><li><a href="/ja/docs/Web/API/Event"><code>Event</code></a></li></ol></details></li><li class="toggle"><details open=""><summary>Service Workers API に関連するページ</summary><ol><li><a href="/ja/docs/Web/API/Cache"><code>Cache</code></a></li><li><a href="/ja/docs/Web/API/CacheStorage"><code>CacheStorage</code></a></li><li><a href="/ja/docs/Web/API/Client"><code>Client</code></a></li><li><a href="/ja/docs/Web/API/Clients"><code>Clients</code></a></li><li><a href="/ja/docs/Web/API/ExtendableEvent"><code>ExtendableEvent</code></a></li><li><a href="/ja/docs/Web/API/ExtendableMessageEvent"><code>ExtendableMessageEvent</code></a></li><li><a href="/ja/docs/Web/API/InstallEvent"><code>InstallEvent</code></a></li><li><a href="/ja/docs/Web/API/NavigationPreloadManager"><code>NavigationPreloadManager</code></a></li><li><a href="/ja/docs/Web/API/Navigator/serviceWorker"><code>Navigator.serviceWorker</code></a></li><li><a href="/ja/docs/Web/API/ServiceWorker"><code>ServiceWorker</code></a></li><li><a href="/ja/docs/Web/API/ServiceWorkerContainer"><code>ServiceWorkerContainer</code></a></li><li><a href="/ja/docs/Web/API/ServiceWorkerGlobalScope"><code>ServiceWorkerGlobalScope</code></a></li><li><a href="/ja/docs/Web/API/ServiceWorkerRegistration"><code>ServiceWorkerRegistration</code></a></li><li><a href="/ja/docs/Web/API/Window/caches"><code>Window.caches</code></a></li><li><a href="/ja/docs/Web/API/WindowClient"><code>WindowClient</code></a></li><li><a href="/ja/docs/Web/API/WorkerGlobalScope/caches"><code>WorkerGlobalScope.caches</code></a></li><li><a href="/ja/docs/Web/API/WorkerNavigator/serviceWorker"><code>WorkerNavigator.serviceWorker</code></a></li></ol></details></li></ol></div></div><section class="place side"></section></nav></aside><div class="toc-container"><aside class="toc"><nav><div class="document-toc-container"><section class="document-toc"><header><h2 class="document-toc-heading">この記事では</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#コンストラクター">コンストラクター</a></li><li class="document-toc-item "><a class="document-toc-link" href="#プロパティ">プロパティ</a></li><li class="document-toc-item "><a class="document-toc-link" href="#メソッド">メソッド</a></li><li class="document-toc-item "><a class="document-toc-link" href="#例">例</a></li><li class="document-toc-item "><a class="document-toc-link" href="#仕様書">仕様書</a></li><li class="document-toc-item "><a class="document-toc-link" href="#ブラウザーの互換性">ブラウザーの互換性</a></li><li class="document-toc-item "><a class="document-toc-link" href="#関連情報">関連情報</a></li></ul></section></div></nav></aside><section class="place side"></section></div></div><main id="content" class="main-content "><article class="main-page-content" lang="ja"><header><h1>FetchEvent</h1><details class="baseline-indicator high"><summary><span class="indicator" role="img" aria-label="Baseline Check"></span><div class="status-title">Baseline <span class="not-bold">Widely available</span> *</div><div class="browsers"><span class="engine" title="Supported in Chrome and Edge"><span class="browser chrome supported" role="img" aria-label="Chrome check"></span><span class="browser edge supported" role="img" aria-label="Edge check"></span></span><span class="engine" title="Supported in Firefox"><span class="browser firefox supported" role="img" aria-label="Firefox check"></span></span><span class="engine" title="Supported in Safari"><span class="browser safari supported" role="img" aria-label="Safari check"></span></span></div><span class="icon icon-chevron "></span></summary><div class="extra"><p>This feature is well established and works across many devices and browser versions. It’s been available across browsers since April 2018.</p><p>* Some parts of this feature may have varying levels of support.</p><ul><li><a href="/ja/docs/Glossary/Baseline/Compatibility" data-glean="baseline_link_learn_more" target="_blank" class="learn-more">Learn more</a></li><li><a href="#ブラウザーの互換性" data-glean="baseline_link_bcd_table">See full compatibility</a></li><li><a href="https://survey.alchemer.com/s3/7634825/MDN-baseline-feedback?page=%2Fja%2Fdocs%2FWeb%2FAPI%2FFetchEvent&level=high" data-glean="baseline_link_feedback" class="feedback-link" target="_blank" rel="noreferrer">Report feedback</a></li></ul></div></details></header><div class="section-content"><p>これは <code>fetch</code> イベント用のイベント型で、<a href="/ja/docs/Web/API/ServiceWorkerGlobalScope" title="サービスワーカーのグローバルスコープ">サービスワーカーのグローバルスコープ</a>に配信されます。これには、リクエストや、受け手がどうレスポンスを扱うのかといった、フェッチに関する情報が含まれています。これは、このフェッチへのレスポンスを提供する <a href="/ja/docs/Web/API/FetchEvent/respondWith" title="event.respondWith()"><code>event.respondWith()</code></a> メソッドを提供します。</p> <svg viewBox="-1 -1 650 42" preserveAspectRatio="xMinYMin meet"><a style="text-decoration: none;" href="/ja/docs/Web/API/Event"> <rect x="0" y="0" width="75" height="25" fill="#fff" stroke="#D4DDE4" stroke-width="2px"></rect> <text x="37.5" y="16" font-size="10px" fill="#4D4E53" text-anchor="middle"> Event </text> </a><line x1="75" y1="14" x2="105" y2="14" stroke="#D4DDE4"></line><polyline points="75,14 85,9 85,19 75,14" stroke="#D4DDE4" fill="#fff"></polyline><a style="text-decoration: none;" href="/ja/docs/Web/API/ExtendableEvent"> <rect x="105" y="0" width="120" height="25" fill="#fff" stroke="#D4DDE4" stroke-width="2px"></rect> <text x="165" y="16" font-size="10px" fill="#4D4E53" text-anchor="middle"> ExtendableEvent </text> </a><line x1="225" y1="14" x2="255" y2="14" stroke="#D4DDE4"></line><polyline points="225,14 235,9 235,19 225,14" stroke="#D4DDE4" fill="#fff"></polyline><a style="text-decoration: none;" href="/ja/docs/Web/API/FetchEvent" aria-current="page"> <rect x="255" y="0" width="80" height="25" fill="#F4F7F8" stroke="#D4DDE4" stroke-width="2px"></rect> <text x="295" y="16" font-size="10px" fill="#4D4E53" text-anchor="middle"> FetchEvent </text> </a></svg></div><section aria-labelledby="コンストラクター"><h2 id="コンストラクター"><a href="#コンストラクター">コンストラクター</a></h2><div class="section-content"><dl> <dt id="fetchevent"><a href="/ja/docs/Web/API/FetchEvent/FetchEvent" title="FetchEvent()"><code>FetchEvent()</code></a></dt> <dd> <p>新しい <code>FetchEvent</code> オブジェクトを作成します。このコンストラクターは通常は使用しません。ブラウザーはこのオブジェクト自体を作成して <code>fetch</code> イベントのコールバックに提供します。</p> </dd> </dl></div></section><section aria-labelledby="プロパティ"><h2 id="プロパティ"><a href="#プロパティ">プロパティ</a></h2><div class="section-content"><p><em>祖先である <a href="/ja/docs/Web/API/Event"><code>Event</code></a> からプロパティを継承しています。</em></p> <dl> <dt id="fetchevent.clientid"><a href="/ja/docs/Web/API/FetchEvent/clientId"><code>FetchEvent.clientId</code></a> <span class="badge inline readonly" title="This value may not be changed.">読取専用</span></dt> <dd> <p>フェッチを開始した同一オリジンの<a href="/ja/docs/Web/API/Client" title="クライアント"><code>クライアント</code></a>の <a href="/ja/docs/Web/API/Client/id" title="id"><code>id</code></a> です。</p> </dd> <dt id="fetchevent.preloadresponse"><a href="/ja/docs/Web/API/FetchEvent/preloadResponse"><code>FetchEvent.preloadResponse</code></a> <span class="badge inline readonly" title="This value may not be changed.">読取専用</span></dt> <dd> <p><a href="/ja/docs/Web/API/Response"><code>Response</code></a> のための <a href="/ja/docs/Web/JavaScript/Reference/Global_Objects/Promise"><code>Promise</code></a>、またはこのフェッチがナビゲーションでない場合や、<a href="/ja/docs/Web/API/NavigationPreloadManager">ナビゲーションの先読み</a>が有効になっていない場合は <code>undefined</code> です。</p> </dd> <dt id="fetchevent.replacesclientid"><a href="/ja/docs/Web/API/FetchEvent/replacesClientId"><code>FetchEvent.replacesClientId</code></a> <span class="badge inline readonly" title="This value may not be changed.">読取専用</span></dt> <dd> <p>ページのナビゲーション中に置き換えられる<a href="/ja/docs/Web/API/Client" title="クライアント"><code>クライアント</code></a>の <a href="/ja/docs/Web/API/Client/id" title="id"><code>id</code></a> です。</p> </dd> <dt id="fetchevent.resultingclientid"><a href="/ja/docs/Web/API/FetchEvent/resultingClientId"><code>FetchEvent.resultingClientId</code></a> <span class="badge inline readonly" title="This value may not be changed.">読取専用</span></dt> <dd> <p>ページのナビゲーション中に前のクライアントを置き換える<a href="/ja/docs/Web/API/Client" title="クライアント"><code>クライアント</code></a>の <a href="/ja/docs/Web/API/Client/id" title="id"><code>id</code></a> です。</p> </dd> <dt id="fetchevent.request"><a href="/ja/docs/Web/API/FetchEvent/request"><code>FetchEvent.request</code></a> <span class="badge inline readonly" title="This value may not be changed.">読取専用</span></dt> <dd> <p>ブラウザーが行おうとしている <a href="/ja/docs/Web/API/Request"><code>Request</code></a> です。</p> </dd> </dl></div></section><section aria-labelledby="メソッド"><h2 id="メソッド"><a href="#メソッド">メソッド</a></h2><div class="section-content"><p><em>親である <a href="/ja/docs/Web/API/ExtendableEvent"><code>ExtendableEvent</code></a> からメソッドを継承しています。</em></p> <dl> <dt id="fetchevent.respondwith"><a href="/ja/docs/Web/API/FetchEvent/respondWith"><code>FetchEvent.respondWith()</code></a></dt> <dd> <p>ブラウザー既定のフェッチ処理を抑止し、自身のレスポンス（のプロミス）を提供します。</p> </dd> <dt id="extendableevent.waituntil"><a href="/ja/docs/Web/API/ExtendableEvent/waitUntil"><code>ExtendableEvent.waitUntil()</code></a></dt> <dd> <p>イベントの存続期間を延長します。ストリーミングやキャッシュなど、レスポンスの返却を超えて延長するタスクをブラウザーに通知するために使用します。</p> </dd> </dl></div></section><section aria-labelledby="例"><h2 id="例"><a href="#例">例</a></h2><div class="section-content"><p>この fetch イベントは、 GET 以外のリクエストに対してブラウザー既定のものを使用します。 GET リクエストに対してはキャッシュから一致するものを返そうとし、ない場合はネットワークから読み取ります。キャッシュに一致するものが見つかった場合、次回ためにキャッシュを非同期に更新します。</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>self.addEventListener("fetch", (event) => { // GET 以外のリクエストでは、ブラウザーに既定のことをさせる if (event.request.method !== "GET") return; // 既定のことを行わず、自分自身のリクエストを扱う event.respondWith( (async () => { // キャッシュからレスポンスの取得を試みる const cache = await caches.open("dynamic-v1"); const cachedResponse = await cache.match(event.request); if (cachedResponse) { // キャッシュに一致するものが見つかった場合は返却し、 // バックグラウンドでキャッシュ内の項目を更新 event.waitUntil(cache.add(event.request)); return cachedResponse; } // キャッシュに一致するものがなければ、ネットワークのものを使用 return fetch(event.request); })(), ); }); </code></pre></div></div></section><h2 id="仕様書"><a href="#仕様書">仕様書</a></h2><table class="standard-table"><thead><tr><th scope="col">Specification</th></tr></thead><tbody><tr><td><a href="https://w3c.github.io/ServiceWorker/#fetchevent-interface">Service Workers <br/><small># fetchevent-interface</small></a></td></tr></tbody></table><h2 id="ブラウザーの互換性"><a href="#ブラウザーの互換性">ブラウザーの互換性</a></h2><p>BCD tables only load in the browser<noscript> with JavaScript enabled. Enable JavaScript to view data.</noscript></p><section aria-labelledby="関連情報"><h2 id="関連情報"><a href="#関連情報">関連情報</a></h2><div class="section-content"><ul> <li><a href="/ja/docs/Web/JavaScript/Reference/Global_Objects/Promise"><code>Promise</code></a></li> <li><a href="/ja/docs/Web/API/Fetch_API">フェッチ API</a></li> </ul></div></section></article><aside class="article-footer"><div class="article-footer-inner"><div class="svg-container"><svg xmlns="http://www.w3.org/2000/svg" width="162" height="162" viewBox="0 0 162 162" fill="none" role="none"><mask id="b" fill="#fff"><path d="M97.203 47.04c8.113-7.886 18.004-13.871 28.906-17.492a78 78 0 0 1 33.969-3.39c11.443 1.39 22.401 5.295 32.024 11.411s17.656 14.28 23.476 23.86c5.819 9.579 9.269 20.318 10.083 31.385a69.85 69.85 0 0 1-5.387 32.44c-4.358 10.272-11.115 19.443-19.747 26.801-8.632 7.359-18.908 12.709-30.034 15.637l-6.17-21.698c7.666-2.017 14.746-5.703 20.694-10.773 5.948-5.071 10.603-11.389 13.606-18.467a48.14 48.14 0 0 0 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Content available under <a href="/ja/docs/MDN/Writing_guidelines/Attrib_copyright_license">a Creative Commons license</a>.</p></div></div></footer></div><script type="application/json" id="hydration">{"url":"/ja/docs/Web/API/FetchEvent","doc":{"body":[{"type":"prose","value":{"id":null,"title":null,"isH3":false,"content":"<p>これは <code>fetch</code> イベント用のイベント型で、<a href=\"/ja/docs/Web/API/ServiceWorkerGlobalScope\" title=\"サービスワーカーのグローバルスコープ\">サービスワーカーのグローバルスコープ</a>に配信されます。これには、リクエストや、受け手がどうレスポンスを扱うのかといった、フェッチに関する情報が含まれています。これは、このフェッチへのレスポンスを提供する <a href=\"/ja/docs/Web/API/FetchEvent/respondWith\" title=\"event.respondWith()\"><code>event.respondWith()</code></a> メソッドを提供します。</p>\n<svg viewBox=\"-1 -1 650 42\" preserveAspectRatio=\"xMinYMin meet\"><a style=\"text-decoration: none;\" href=\"/ja/docs/Web/API/Event\">\n <rect x=\"0\" y=\"0\" width=\"75\" height=\"25\" fill=\"#fff\" stroke=\"#D4DDE4\" stroke-width=\"2px\"></rect>\n <text x=\"37.5\" y=\"16\" font-size=\"10px\" fill=\"#4D4E53\" text-anchor=\"middle\">\n Event\n </text>\n </a><line x1=\"75\" y1=\"14\" x2=\"105\" y2=\"14\" stroke=\"#D4DDE4\"></line><polyline points=\"75,14 85,9 85,19 75,14\" stroke=\"#D4DDE4\" fill=\"#fff\"></polyline><a style=\"text-decoration: none;\" href=\"/ja/docs/Web/API/ExtendableEvent\">\n <rect x=\"105\" y=\"0\" width=\"120\" height=\"25\" fill=\"#fff\" stroke=\"#D4DDE4\" stroke-width=\"2px\"></rect>\n <text x=\"165\" y=\"16\" font-size=\"10px\" fill=\"#4D4E53\" text-anchor=\"middle\">\n ExtendableEvent\n </text>\n </a><line x1=\"225\" y1=\"14\" x2=\"255\" y2=\"14\" stroke=\"#D4DDE4\"></line><polyline points=\"225,14 235,9 235,19 225,14\" stroke=\"#D4DDE4\" fill=\"#fff\"></polyline><a style=\"text-decoration: none;\" href=\"/ja/docs/Web/API/FetchEvent\" aria-current=\"page\">\n <rect x=\"255\" y=\"0\" width=\"80\" height=\"25\" fill=\"#F4F7F8\" stroke=\"#D4DDE4\" stroke-width=\"2px\"></rect>\n <text x=\"295\" y=\"16\" font-size=\"10px\" fill=\"#4D4E53\" text-anchor=\"middle\">\n FetchEvent\n </text>\n </a></svg>"}},{"type":"prose","value":{"id":"コンストラクター","title":"コンストラクター","isH3":false,"content":"<dl>\n<dt id=\"fetchevent\"><a href=\"/ja/docs/Web/API/FetchEvent/FetchEvent\" title=\"FetchEvent()\"><code>FetchEvent()</code></a></dt>\n<dd>\n<p>新しい <code>FetchEvent</code> オブジェクトを作成します。このコンストラクターは通常は使用しません。ブラウザーはこのオブジェクト自体を作成して <code>fetch</code> イベントのコールバックに提供します。</p>\n</dd>\n</dl>"}},{"type":"prose","value":{"id":"プロパティ","title":"プロパティ","isH3":false,"content":"<p><em>祖先である <a href=\"/ja/docs/Web/API/Event\"><code>Event</code></a> からプロパティを継承しています。</em></p>\n<dl>\n<dt id=\"fetchevent.clientid\"><a href=\"/ja/docs/Web/API/FetchEvent/clientId\"><code>FetchEvent.clientId</code></a> <span class=\"badge inline readonly\" title=\"This value may not be changed.\">読取専用</span></dt>\n<dd>\n<p>フェッチを開始した同一オリジンの<a href=\"/ja/docs/Web/API/Client\" title=\"クライアント\"><code>クライアント</code></a>の <a href=\"/ja/docs/Web/API/Client/id\" title=\"id\"><code>id</code></a> です。</p>\n</dd>\n<dt id=\"fetchevent.preloadresponse\"><a href=\"/ja/docs/Web/API/FetchEvent/preloadResponse\"><code>FetchEvent.preloadResponse</code></a> <span class=\"badge inline readonly\" title=\"This value may not be changed.\">読取専用</span></dt>\n<dd>\n<p><a href=\"/ja/docs/Web/API/Response\"><code>Response</code></a> のための <a href=\"/ja/docs/Web/JavaScript/Reference/Global_Objects/Promise\"><code>Promise</code></a>、またはこのフェッチがナビゲーションでない場合や、<a href=\"/ja/docs/Web/API/NavigationPreloadManager\">ナビゲーションの先読み</a>が有効になっていない場合は <code>undefined</code> です。</p>\n</dd>\n<dt id=\"fetchevent.replacesclientid\"><a href=\"/ja/docs/Web/API/FetchEvent/replacesClientId\"><code>FetchEvent.replacesClientId</code></a> <span class=\"badge inline readonly\" title=\"This value may not be changed.\">読取専用</span></dt>\n<dd>\n<p>ページのナビゲーション中に置き換えられる<a href=\"/ja/docs/Web/API/Client\" title=\"クライアント\"><code>クライアント</code></a>の <a href=\"/ja/docs/Web/API/Client/id\" title=\"id\"><code>id</code></a> です。</p>\n</dd>\n<dt id=\"fetchevent.resultingclientid\"><a href=\"/ja/docs/Web/API/FetchEvent/resultingClientId\"><code>FetchEvent.resultingClientId</code></a> <span class=\"badge inline readonly\" title=\"This value may not be changed.\">読取専用</span></dt>\n<dd>\n<p>ページのナビゲーション中に前のクライアントを置き換える<a href=\"/ja/docs/Web/API/Client\" title=\"クライアント\"><code>クライアント</code></a>の <a href=\"/ja/docs/Web/API/Client/id\" title=\"id\"><code>id</code></a> です。</p>\n</dd>\n<dt id=\"fetchevent.request\"><a href=\"/ja/docs/Web/API/FetchEvent/request\"><code>FetchEvent.request</code></a> <span class=\"badge inline readonly\" title=\"This value may not be changed.\">読取専用</span></dt>\n<dd>\n<p>ブラウザーが行おうとしている <a href=\"/ja/docs/Web/API/Request\"><code>Request</code></a> です。</p>\n</dd>\n</dl>"}},{"type":"prose","value":{"id":"メソッド","title":"メソッド","isH3":false,"content":"<p><em>親である <a href=\"/ja/docs/Web/API/ExtendableEvent\"><code>ExtendableEvent</code></a> からメソッドを継承しています。</em></p>\n<dl>\n<dt id=\"fetchevent.respondwith\"><a href=\"/ja/docs/Web/API/FetchEvent/respondWith\"><code>FetchEvent.respondWith()</code></a></dt>\n<dd>\n<p>ブラウザー既定のフェッチ処理を抑止し、自身のレスポンス（のプロミス）を提供します。</p>\n</dd>\n<dt id=\"extendableevent.waituntil\"><a href=\"/ja/docs/Web/API/ExtendableEvent/waitUntil\"><code>ExtendableEvent.waitUntil()</code></a></dt>\n<dd>\n<p>イベントの存続期間を延長します。ストリーミングやキャッシュなど、レスポンスの返却を超えて延長するタスクをブラウザーに通知するために使用します。</p>\n</dd>\n</dl>"}},{"type":"prose","value":{"id":"例","title":"例","isH3":false,"content":"<p>この fetch イベントは、 GET 以外のリクエストに対してブラウザー既定のものを使用します。 GET リクエストに対してはキャッシュから一致するものを返そうとし、ない場合はネットワークから読み取ります。キャッシュに一致するものが見つかった場合、次回ためにキャッシュを非同期に更新します。</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>self.addEventListener(\"fetch\", (event) => {\n // GET 以外のリクエストでは、ブラウザーに既定のことをさせる\n if (event.request.method !== \"GET\") return;\n\n // 既定のことを行わず、自分自身のリクエストを扱う\n event.respondWith(\n (async () => {\n // キャッシュからレスポンスの取得を試みる\n const cache = await caches.open(\"dynamic-v1\");\n const cachedResponse = await cache.match(event.request);\n\n if (cachedResponse) {\n // キャッシュに一致するものが見つかった場合は返却し、\n // バックグラウンドでキャッシュ内の項目を更新\n event.waitUntil(cache.add(event.request));\n return cachedResponse;\n }\n\n // キャッシュに一致するものがなければ、ネットワークのものを使用\n return fetch(event.request);\n })(),\n );\n});\n</code></pre></div>"}},{"type":"specifications","value":{"id":"仕様書","title":"仕様書","isH3":false,"specifications":[{"bcdSpecificationURL":"https://w3c.github.io/ServiceWorker/#fetchevent-interface","title":"Service Workers"}],"query":"api.FetchEvent"}},{"type":"browser_compatibility","value":{"id":"ブラウザーの互換性","title":"ブラウザーの互換性","isH3":false,"query":"api.FetchEvent"}},{"type":"prose","value":{"id":"関連情報","title":"関連情報","isH3":false,"content":"<ul>\n<li><a href=\"/ja/docs/Web/JavaScript/Reference/Global_Objects/Promise\"><code>Promise</code></a></li>\n<li><a href=\"/ja/docs/Web/API/Fetch_API\">フェッチ API</a></li>\n</ul>"}}],"isActive":true,"isMarkdown":true,"isTranslated":true,"locale":"ja","mdn_url":"/ja/docs/Web/API/FetchEvent","modified":"2023-08-04T07:52:49.000Z","native":"日本語","noIndexing":false,"other_translations":[{"locale":"en-US","title":"FetchEvent","native":"English (US)"},{"locale":"de","title":"FetchEvent","native":"Deutsch"},{"locale":"es","title":"FetchEvent","native":"Español"},{"locale":"fr","title":"FetchEvent","native":"Français"},{"locale":"ru","title":"FetchEvent","native":"Русский"},{"locale":"zh-CN","title":"FetchEvent","native":"中文 (简体)"}],"pageTitle":"FetchEvent - Web API | MDN","parents":[{"uri":"/ja/docs/Web","title":"開発者向けのウェブ技術"},{"uri":"/ja/docs/Web/API","title":"Web API"},{"uri":"/ja/docs/Web/API/FetchEvent","title":"FetchEvent"}],"popularity":null,"short_title":"FetchEvent","sidebarHTML":"<ol><li class=\"section\"><a href=\"/ja/docs/Web/API/Service_Worker_API\">サービスワーカー API</a></li><li class=\"section\"><em><a href=\"/ja/docs/Web/API/FetchEvent\" aria-current=\"page\"><code>FetchEvent</code></a></em></li><li class=\"toggle\"><details open=\"\"><summary>コンストラクター</summary><ol><li><a href=\"/ja/docs/Web/API/FetchEvent/FetchEvent\"><code>FetchEvent()</code></a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>インスタンスプロパティ</summary><ol><li><a href=\"/ja/docs/Web/API/FetchEvent/clientId\"><code>clientId</code></a></li><li><a href=\"/ja/docs/Web/API/FetchEvent/handled\"><code>handled</code></a></li><li><a href=\"/ja/docs/Web/API/FetchEvent/isReload\"><code>isReload</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">非標準</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">非推奨;</span>\n</abbr></li><li><a href=\"/ja/docs/Web/API/FetchEvent/preloadResponse\"><code>preloadResponse</code></a></li><li><a href=\"/ja/docs/Web/API/FetchEvent/replacesClientId\"><code>replacesClientId</code></a></li><li><a href=\"/ja/docs/Web/API/FetchEvent/request\"><code>request</code></a></li><li><a href=\"/ja/docs/Web/API/FetchEvent/resultingClientId\"><code>resultingClientId</code></a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>インスタンスメソッド</summary><ol><li><a href=\"/ja/docs/Web/API/FetchEvent/respondWith\"><code>respondWith()</code></a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>継承</summary><ol><li><a href=\"/ja/docs/Web/API/ExtendableEvent\"><code>ExtendableEvent</code></a></li><li><a href=\"/ja/docs/Web/API/Event\"><code>Event</code></a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>Service Workers API に関連するページ</summary><ol><li><a href=\"/ja/docs/Web/API/Cache\"><code>Cache</code></a></li><li><a href=\"/ja/docs/Web/API/CacheStorage\"><code>CacheStorage</code></a></li><li><a href=\"/ja/docs/Web/API/Client\"><code>Client</code></a></li><li><a href=\"/ja/docs/Web/API/Clients\"><code>Clients</code></a></li><li><a href=\"/ja/docs/Web/API/ExtendableEvent\"><code>ExtendableEvent</code></a></li><li><a href=\"/ja/docs/Web/API/ExtendableMessageEvent\"><code>ExtendableMessageEvent</code></a></li><li><a href=\"/ja/docs/Web/API/InstallEvent\"><code>InstallEvent</code></a></li><li><a href=\"/ja/docs/Web/API/NavigationPreloadManager\"><code>NavigationPreloadManager</code></a></li><li><a href=\"/ja/docs/Web/API/Navigator/serviceWorker\"><code>Navigator.serviceWorker</code></a></li><li><a href=\"/ja/docs/Web/API/ServiceWorker\"><code>ServiceWorker</code></a></li><li><a href=\"/ja/docs/Web/API/ServiceWorkerContainer\"><code>ServiceWorkerContainer</code></a></li><li><a href=\"/ja/docs/Web/API/ServiceWorkerGlobalScope\"><code>ServiceWorkerGlobalScope</code></a></li><li><a href=\"/ja/docs/Web/API/ServiceWorkerRegistration\"><code>ServiceWorkerRegistration</code></a></li><li><a href=\"/ja/docs/Web/API/Window/caches\"><code>Window.caches</code></a></li><li><a href=\"/ja/docs/Web/API/WindowClient\"><code>WindowClient</code></a></li><li><a href=\"/ja/docs/Web/API/WorkerGlobalScope/caches\"><code>WorkerGlobalScope.caches</code></a></li><li><a href=\"/ja/docs/Web/API/WorkerNavigator/serviceWorker\"><code>WorkerNavigator.serviceWorker</code></a></li></ol></details></li></ol>","source":{"folder":"ja/web/api/fetchevent","github_url":"https://github.com/mdn/translated-content/blob/main/files/ja/web/api/fetchevent/index.md","last_commit_url":"https://github.com/mdn/translated-content/commit/eed44f980132b7263d95fb5beb13e5a39a1cc006","filename":"index.md"},"summary":"これは fetch イベント用のイベント型で、サービスワーカーのグローバルスコープに配信されます。これには、リクエストや、受け手がどうレスポンスを扱うのかといった、フェッチに関する情報が含まれています。これは、このフェッチへのレスポンスを提供する event.respondWith() メソッドを提供します。","title":"FetchEvent","toc":[{"text":"コンストラクター","id":"コンストラクター"},{"text":"プロパティ","id":"プロパティ"},{"text":"メソッド","id":"メソッド"},{"text":"例","id":"例"},{"text":"仕様書","id":"仕様書"},{"text":"ブラウザーの互換性","id":"ブラウザーの互換性"},{"text":"関連情報","id":"関連情報"}],"baseline":{"baseline":"high","baseline_low_date":"2018-04-30","baseline_high_date":"2020-10-30","support":{"chrome":"45","chrome_android":"45","edge":"17","firefox":"44","firefox_android":"44","safari":"11.1","safari_ios":"11.3"},"asterisk":true},"browserCompat":["api.FetchEvent"],"pageType":"web-api-interface"}}</script></body></html>