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Title: 遅延フェッチの使用 - Web API | MDN

Open Graph Title: 遅延フェッチの使用 - Web API | MDN

Description: fetchLater() API は、指定した時間が経過した後、またはページが閉じられたとき、あるいは別のページに移動したときに送信される遅延フェッチをリクエストするためのインターフェイスを提供します。

Open Graph Description: fetchLater() API は、指定した時間が経過した後、またはページが閉じられたとき、あるいは別のページに移動したときに送信される遅延フェッチをリクエストするためのインターフェイスを提供します。

Opengraph URL: https://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch

direct link

Domain: developer.mozilla.org

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メインコンテンツへスキップhttps://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch#content
検索へスキップhttps://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch#search
MDN https://developer.mozilla.org/ja/
HTML: Markup languagehttps://developer.mozilla.org/ja/docs/Web/HTML
Elementshttps://developer.mozilla.org/ja/docs/Web/HTML/Reference/Elements
Global attributeshttps://developer.mozilla.org/ja/docs/Web/HTML/Reference/Global_attributes
Attributeshttps://developer.mozilla.org/ja/docs/Web/HTML/Reference/Attributes
See all…https://developer.mozilla.org/ja/docs/Web/HTML/Reference
Responsive imageshttps://developer.mozilla.org/ja/docs/Web/HTML/Guides/Responsive_images
HTML cheatsheethttps://developer.mozilla.org/ja/docs/Web/HTML/Guides/Cheatsheet
Date & time formatshttps://developer.mozilla.org/ja/docs/Web/HTML/Guides/Date_and_time_formats
See all…https://developer.mozilla.org/ja/docs/Web/HTML/Guides
SVGhttps://developer.mozilla.org/ja/docs/Web/SVG
MathMLhttps://developer.mozilla.org/ja/docs/Web/MathML
XMLhttps://developer.mozilla.org/ja/docs/Web/XML
CSS: Styling languagehttps://developer.mozilla.org/ja/docs/Web/CSS
Propertieshttps://developer.mozilla.org/ja/docs/Web/CSS/Reference/Properties
Selectorshttps://developer.mozilla.org/ja/docs/Web/CSS/Reference/Selectors
At-ruleshttps://developer.mozilla.org/ja/docs/Web/CSS/Reference/At-rules
Valueshttps://developer.mozilla.org/ja/docs/Web/CSS/Reference/Values
See all…https://developer.mozilla.org/ja/docs/Web/CSS/Reference
Box modelhttps://developer.mozilla.org/ja/docs/Web/CSS/Guides/Box_model/Introduction
Animationshttps://developer.mozilla.org/ja/docs/Web/CSS/Guides/Animations/Using
Flexboxhttps://developer.mozilla.org/ja/docs/Web/CSS/Guides/Flexible_box_layout/Basic_concepts
Colorshttps://developer.mozilla.org/ja/docs/Web/CSS/Guides/Colors/Applying_color
See all…https://developer.mozilla.org/ja/docs/Web/CSS/Guides
Column layoutshttps://developer.mozilla.org/ja/docs/Web/CSS/How_to/Layout_cookbook/Column_layouts
Centering an elementhttps://developer.mozilla.org/ja/docs/Web/CSS/How_to/Layout_cookbook/Center_an_element
Card componenthttps://developer.mozilla.org/ja/docs/Web/CSS/How_to/Layout_cookbook/Card
See all…https://developer.mozilla.org/ja/docs/Web/CSS/How_to/Layout_cookbook
JavaScript: Scripting languagehttps://developer.mozilla.org/ja/docs/Web/JavaScript
Standard built-in objectshttps://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Global_Objects
Expressions & operatorshttps://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Operators
Statements & declarationshttps://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Statements
Functionshttps://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Functions
See all…https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference
Control flow & error handinghttps://developer.mozilla.org/ja/docs/Web/JavaScript/Guide/Control_flow_and_error_handling
Loops and iterationhttps://developer.mozilla.org/ja/docs/Web/JavaScript/Guide/Loops_and_iteration
Working with objectshttps://developer.mozilla.org/ja/docs/Web/JavaScript/Guide/Working_with_objects
Using classeshttps://developer.mozilla.org/ja/docs/Web/JavaScript/Guide/Using_classes
See all…https://developer.mozilla.org/ja/docs/Web/JavaScript/Guide
Web APIs: Programming interfaceshttps://developer.mozilla.org/ja/docs/Web/API
File system APIhttps://developer.mozilla.org/ja/docs/Web/API/File_System_API
Fetch APIhttps://developer.mozilla.org/ja/docs/Web/API/Fetch_API
Geolocation APIhttps://developer.mozilla.org/ja/docs/Web/API/Geolocation_API
HTML DOM APIhttps://developer.mozilla.org/ja/docs/Web/API/HTML_DOM_API
Push APIhttps://developer.mozilla.org/ja/docs/Web/API/Push_API
Service worker APIhttps://developer.mozilla.org/ja/docs/Web/API/Service_Worker_API
See all…https://developer.mozilla.org/ja/docs/Web/API
Using the Web animation APIhttps://developer.mozilla.org/ja/docs/Web/API/Web_Animations_API/Using_the_Web_Animations_API
Using the Fetch APIhttps://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Fetch
Working with the History APIhttps://developer.mozilla.org/ja/docs/Web/API/History_API/Working_with_the_History_API
Using the Web speech APIhttps://developer.mozilla.org/ja/docs/Web/API/Web_Speech_API/Using_the_Web_Speech_API
Using web workershttps://developer.mozilla.org/ja/docs/Web/API/Web_Workers_API/Using_web_workers
All web technologyhttps://developer.mozilla.org/ja/docs/Web
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WebDriverhttps://developer.mozilla.org/ja/docs/Web/WebDriver
See all…https://developer.mozilla.org/ja/docs/Web
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Privacyhttps://developer.mozilla.org/ja/docs/Web/Privacy
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Check out the video course from Scrimba, our partnerhttps://scrimba.com/frontend-path-c0j?via=mdn-learn-navbar
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HTTP Observatoryhttps://developer.mozilla.org/en-US/observatory
Border-image generatorhttps://developer.mozilla.org/ja/docs/Web/CSS/Guides/Backgrounds_and_borders/Border-image_generator
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Color format converterhttps://developer.mozilla.org/ja/docs/Web/CSS/Guides/Colors/Color_format_converter
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About MDNhttps://developer.mozilla.org/en-US/about
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開発者向けのウェブ技術https://developer.mozilla.org/ja/docs/Web
Web APIhttps://developer.mozilla.org/ja/docs/Web/API
フェッチ APIhttps://developer.mozilla.org/ja/docs/Web/API/Fetch_API
遅延フェッチの使用https://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch
https://github.com/orgs/mdn/discussions/739
https://developer.mozilla.org/de/docs/Web/API/Fetch_API/Using_Deferred_Fetch
https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Deferred_Fetch
https://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch
https://developer.mozilla.org/zh-CN/docs/Web/API/Fetch_API/Using_Deferred_Fetch
コミュニティーについてもっと知り、仲間になるにはこちらから。https://developer.mozilla.org/ja/docs/MDN/Community/Contributing/Translated_content#アクティブなロケール
https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Deferred_Fetch
概要https://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch#概要
クォータhttps://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch#クォータ
クォータの例https://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch#クォータの例
概要https://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch#概要
https://developer.mozilla.org/ja/docs/Web/HTML/Reference/Elements/img
XMLHttpRequesthttps://developer.mozilla.org/ja/docs/Web/API/XMLHttpRequest
ビーコン APIhttps://developer.mozilla.org/ja/docs/Web/API/Beacon_API
フェッチ APIhttps://developer.mozilla.org/ja/docs/Web/API/Fetch_API
keepalivehttps://developer.mozilla.org/ja/docs/Web/API/Request/keepalive
unloadhttps://developer.mozilla.org/ja/docs/Web/API/Window/unload_event
beforeunloadhttps://developer.mozilla.org/ja/docs/Web/API/Window/beforeunload_event
pagehidehttps://developer.mozilla.org/ja/docs/Web/API/Window/pagehide_event
visibilitychangehttps://developer.mozilla.org/ja/docs/Web/API/Document/visibilitychange_event
フェッチ APIhttps://developer.mozilla.org/ja/docs/Web/API/Fetch_API
AbortControllerhttps://developer.mozilla.org/ja/docs/Web/API/AbortController
クォータhttps://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch#クォータ
deferred-fetchhttps://developer.mozilla.org/ja/docs/Web/HTTP/Reference/Headers/Permissions-Policy/deferred-fetch
deferred-fetch-minimalhttps://developer.mozilla.org/ja/docs/Web/HTTP/Reference/Headers/Permissions-Policy/deferred-fetch-minimal
権限ポリシーhttps://developer.mozilla.org/ja/docs/Web/HTTP/Guides/Permissions_Policy
報告元およびサブフレームごとの割当制限https://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch#報告元およびサブフレームごとの割当制限
最上位クォータを共有することで、サブフレームのクォータを増やすhttps://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch#最上位クォータを共有することで、サブフレームのクォータを増やす
共有クォータの制限https://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch#共有クォータの制限
deferred-fetch-minimalhttps://developer.mozilla.org/ja/docs/Web/HTTP/Reference/Headers/Permissions-Policy/deferred-fetch-minimal
deferred-fetch-minimalhttps://developer.mozilla.org/ja/docs/Web/HTTP/Reference/Headers/Permissions-Policy/deferred-fetch-minimal
サブフレームのサブフレームへのクォータの委譲https://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch#サブフレームのサブフレームへのクォータの委譲
Permissions-Policyhttps://developer.mozilla.org/ja/docs/Web/HTTP/Reference/Headers/Permissions-Policy
クォータを超過した場合https://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch#クォータを超過した場合
fetchLater()https://developer.mozilla.org/ja/docs/Web/API/Window/fetchLater
クォータの例https://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch#クォータの例
最低限のクォータをすべて使用するhttps://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch#最低限のクォータをすべて使用する
名前付きオリジンに対する最低クォータの制限を解除するhttps://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch#名前付きオリジンに対する最低クォータの制限を解除する
最上位の例外を除き、最低クォータを完全に撤廃するhttps://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch#最上位の例外を除き、最低クォータを完全に撤廃する
例外なく、最低クォータを完全に撤廃するhttps://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch#例外なく、最低クォータを完全に撤廃する
同一オリジンのサブフレームは、最上位レベルとクォータを共有し、サブフレームに権限を委譲することが可能https://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch#同一オリジンのサブフレームは、最上位レベルとクォータを共有し、サブフレームに権限を委譲することが可能
同一オリジンのサブフレームは、オリジンを越えるサブフレームによって分離されている場合、最上位とクォータを共有することはできないhttps://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch#同一オリジンのサブフレームは、オリジンを越えるサブフレームによって分離されている場合、最上位とクォータを共有することはできない
サブフレームの二次サブフレームは、デフォルトでクォータを取得しないhttps://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch#サブフレームの二次サブフレームは、デフォルトでクォータを取得しない
別のサブフレームに全クォータを割り当てるhttps://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch#別のサブフレームに全クォータを割り当てる
リダイレクトではクォータは移譲されないhttps://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch#リダイレクトではクォータは移譲されない
サンドボックス化された同じオリジンからの iframe は、実質的に別個のオリジンとなるhttps://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch#サンドボックス化された同じオリジンからの_iframe_は、実質的に別個のオリジンとなる
iframe からの fetchLater() の実行を禁止するhttps://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch#iframe_からの_fetchlater_の実行を禁止する
allowhttps://developer.mozilla.org/ja/docs/Web/HTML/Reference/Elements/iframe#allow
QuotaExceededError が発生する例https://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch#quotaexceedederror_が発生する例
最終的に QuotaExceededError を発生させる例https://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch#最終的に_quotaexceedederror_を発生させる例
サブフレームから最上位のオリジンへのリダイレクトにより、最上位のクォータを使用できるhttps://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch#サブフレームから最上位のオリジンへのリダイレクトにより、最上位のクォータを使用できる
協力方法を知るhttps://developer.mozilla.org/ja/docs/MDN/Community/Getting_started
MDN の貢献者https://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch/contributors.txt
GitHub でこのページを表示https://github.com/mdn/translated-content/blob/main/files/ja/web/api/fetch_api/using_deferred_fetch/index.md?plain=1
このコンテンツに関する問題を報告https://github.com/mdn/translated-content/issues/new?template=page-report-ja.yml&mdn-url=https%3A%2F%2Fdeveloper.mozilla.org%2Fja%2Fdocs%2FWeb%2FAPI%2FFetch_API%2FUsing_Deferred_Fetch&metadata=%3C%21--+Do+not+make+changes+below+this+line+--%3E%0A%3Cdetails%3E%0A%3Csummary%3EPage+report+details%3C%2Fsummary%3E%0A%0A*+Folder%3A+%60ja%2Fweb%2Fapi%2Ffetch_api%2Fusing_deferred_fetch%60%0A*+MDN+URL%3A+https%3A%2F%2Fdeveloper.mozilla.org%2Fja%2Fdocs%2FWeb%2FAPI%2FFetch_API%2FUsing_Deferred_Fetch%0A*+GitHub+URL%3A+https%3A%2F%2Fgithub.com%2Fmdn%2Ftranslated-content%2Fblob%2Fmain%2Ffiles%2Fja%2Fweb%2Fapi%2Ffetch_api%2Fusing_deferred_fetch%2Findex.md%0A*+Last+commit%3A+https%3A%2F%2Fgithub.com%2Fmdn%2Ftranslated-content%2Fcommit%2F27f8638c8812779667d19c8792ccc735c29495d6%0A*+Document+last+modified%3A+2026-07-01T11%3A49%3A34.000Z%0A%0A%3C%2Fdetails%3E
フェッチ APIhttps://developer.mozilla.org/ja/docs/Web/API/Fetch_API
フェッチ API の使用https://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Fetch
遅延フェッチの使用https://developer.mozilla.org/ja/docs/Web/API/Fetch_API/Using_Deferred_Fetch
DeferredRequestInithttps://developer.mozilla.org/en-US/docs/Web/API/DeferredRequestInit
FetchLaterResulthttps://developer.mozilla.org/en-US/docs/Web/API/FetchLaterResult
Headershttps://developer.mozilla.org/ja/docs/Web/API/Headers
Requesthttps://developer.mozilla.org/ja/docs/Web/API/Request
RequestInithttps://developer.mozilla.org/ja/docs/Web/API/RequestInit
Responsehttps://developer.mozilla.org/ja/docs/Web/API/Response
Window.fetch()https://developer.mozilla.org/ja/docs/Web/API/Window/fetch
WorkerGlobalScope.fetch()https://developer.mozilla.org/ja/docs/Web/API/WorkerGlobalScope/fetch
Window.fetchLater()https://developer.mozilla.org/ja/docs/Web/API/Window/fetchLater
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テレメトリー設定https://www.mozilla.org/en-US/privacy/websites/data-preferences/
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