• Skip to main content
  • Skip to search
  • Skip to select language
MDN Web Docs
  • References
    • Overview / Web Technology

      Web technology reference for developers

    • HTML

      Structure of content on the web

    • CSS

      Code used to describe document style

    • JavaScript

      General-purpose scripting language

    • HTTP

      Protocol for transmitting web resources

    • Web APIs

      Interfaces for building web applications

    • Web Extensions

      Developing extensions for web browsers

    • Web Technology

      Web technology reference for developers

  • Guides
    • Overview / MDN Learning Area

      Learn web development

    • MDN Learning Area

      Learn web development

    • HTML

      Learn to structure web content with HTML

    • CSS

      Learn to style content using CSS

    • JavaScript

      Learn to run scripts in the browser

    • Accessibility

      Learn to make the web accessible to all

  • Plus
    • Overview

      A customized MDN experience

    • AI Help

      Get real-time assistance and support

    • Updates

      All browser compatibility updates at a glance

    • Documentation

      Learn how to use MDN Plus

    • FAQ

      Frequently asked questions about MDN Plus

  • Curriculum New
  • Blog
    • Playground

      Write, test and share your code

    • HTTP Observatory

      Scan a website for free

    • AI Help

      Get real-time assistance and support

  • Log in
  • Sign up for free
  1. 開発者向けのウェブ技術
  2. HTTP
  3. HTTP ヘッダー
  4. NEL
    • English (US)
    • Português (do Brasil)
    • 中文 (简体)

このページはコミュニティーの尽力で英語から翻訳されました。MDN Web Docs 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。

この記事では

  • 構文
  • 仕様書
  • 関連情報
  1. HTTP
  2. ガイド
  3. リソースと URI
    1. ウェブ上のリソースの識別
    2. データ URL
    3. MIME タイプ入門
    4. よくある MIME タイプ
    5. www 付きと www なしの URL の選択
  4. HTTP ガイド
    1. HTTP の基本
    2. HTTP の概要
    3. HTTP の進化
    4. HTTP メッセージ
    5. 典型的な HTTP セッション
    6. HTTP/1.x のコネクション管理
    7. プロトコルのアップグレードの仕組み
  5. HTTP セキュリティ
    1. Content Security Policy (CSP)
    2. Strict-Transport-Security
    3. X-Content-Type-Options
    4. X-Frame-Options 非推奨;
    5. X-XSS-Protection 非標準
    6. サイトの安全化
    7. HTTP Observatory
  6. HTTP アクセス制御 (CORS)
  7. HTTP 認証
  8. HTTP キャッシュ
  9. HTTP の圧縮
  10. HTTP 条件付きリクエスト
  11. コンテントネゴシエーション
  12. HTTP Cookie
  13. HTTP 範囲リクエスト
  14. HTTP のリダイレクト
  15. HTTP 仕様書
  16. 機能ポリシー
  17. リファレンス
  18. HTTP ヘッダー
    1. Accept
    2. Accept-CH
    3. Accept-Charset
    4. Accept-Encoding
    5. Accept-Language
    6. Accept-Patch
    7. Accept-Post
    8. Accept-Ranges
    9. Access-Control-Allow-Credentials
    10. Access-Control-Allow-Headers
    11. Access-Control-Allow-Methods
    12. Access-Control-Allow-Origin
    13. Access-Control-Expose-Headers
    14. Access-Control-Max-Age
    15. Access-Control-Request-Headers
    16. Access-Control-Request-Method
    17. Age
    18. Allow
    19. Alt-Svc
    20. Alt-Used
    21. Attribution-Reporting-Eligible Experimental
    22. Attribution-Reporting-Register-Source Experimental
    23. Attribution-Reporting-Register-Trigger Experimental
    24. Authorization
    25. Cache-Control
    26. Clear-Site-Data
    27. Connection
    28. Content-Digest
    29. Content-Disposition
    30. Content-DPR 非標準 非推奨;
    31. Content-Encoding
    32. Content-Language
    33. Content-Length
    34. Content-Location
    35. Content-Range
    36. Content-Security-Policy
    37. Content-Security-Policy-Report-Only
    38. Content-Type
    39. Cookie
    40. Critical-CH Experimental
    41. Cross-Origin-Embedder-Policy
    42. Cross-Origin-Opener-Policy
    43. Cross-Origin-Resource-Policy
    44. Date
    45. Device-Memory
    46. Digest 非標準 非推奨;
    47. DNT 非標準 非推奨;
    48. Downlink Experimental
    49. DPR 非標準 非推奨;
    50. Early-Data Experimental
    51. ECT Experimental
    52. ETag
    53. Expect
    54. Expect-CT 非推奨;
    55. Expires
    56. Forwarded
    57. From
    58. Host
    59. If-Match
    60. If-Modified-Since
    61. If-None-Match
    62. If-Range
    63. If-Unmodified-Since
    64. Keep-Alive
    65. Last-Modified
    66. Link
    67. Location
    68. Max-Forwards
    69. NEL Experimental
    70. No-Vary-Search Experimental
    71. Observe-Browsing-Topics Experimental 非標準
    72. Origin
    73. Origin-Agent-Cluster Experimental
    74. Permissions-Policy
    75. Pragma 非推奨;
    76. Priority
    77. Proxy-Authenticate
    78. Proxy-Authorization
    79. Range
    80. Referer
    81. Referrer-Policy
    82. Refresh
    83. Report-To 非標準 非推奨;
    84. Reporting-Endpoints Experimental
    85. Repr-Digest
    86. Retry-After
    87. RTT Experimental
    88. Save-Data Experimental
    89. Sec-Browsing-Topics Experimental 非標準
    90. Sec-CH-Prefers-Color-Scheme Experimental
    91. Sec-CH-Prefers-Reduced-Motion Experimental
    92. Sec-CH-Prefers-Reduced-Transparency Experimental
    93. Sec-CH-UA Experimental
    94. Sec-CH-UA-Arch Experimental
    95. Sec-CH-UA-Bitness Experimental
    96. Sec-CH-UA-Full-Version 非推奨;
    97. Sec-CH-UA-Full-Version-List Experimental
    98. Sec-CH-UA-Mobile Experimental
    99. Sec-CH-UA-Model Experimental
    100. Sec-CH-UA-Platform Experimental
    101. Sec-CH-UA-Platform-Version Experimental
    102. Sec-Fetch-Dest
    103. Sec-Fetch-Mode
    104. Sec-Fetch-Site
    105. Sec-Fetch-User
    106. Sec-GPC Experimental 非標準
    107. Sec-Purpose
    108. Sec-WebSocket-Accept
    109. Sec-WebSocket-Extensions
    110. Sec-WebSocket-Key
    111. Sec-WebSocket-Protocol
    112. Sec-WebSocket-Version
    113. Server
    114. Server-Timing
    115. Service-Worker-Navigation-Preload
    116. Set-Cookie
    117. Set-Login Experimental
    118. SourceMap
    119. Speculation-Rules Experimental
    120. Strict-Transport-Security
    121. Supports-Loading-Mode Experimental
    122. TE
    123. Timing-Allow-Origin
    124. Tk 非標準 非推奨;
    125. Trailer
    126. Transfer-Encoding
    127. Upgrade
    128. Upgrade-Insecure-Requests
    129. User-Agent
    130. Vary
    131. Via
    132. Viewport-Width 非標準 非推奨;
    133. Want-Content-Digest
    134. Want-Digest 非標準 非推奨;
    135. Want-Repr-Digest
    136. Warning 非推奨;
    137. Width 非標準 非推奨;
    138. WWW-Authenticate
    139. X-Content-Type-Options
    140. X-DNS-Prefetch-Control 非標準
    141. X-Forwarded-For 非標準
    142. X-Forwarded-Host 非標準
    143. X-Forwarded-Proto 非標準
    144. X-Frame-Options 非推奨;
    145. X-XSS-Protection 非標準
  19. HTTP リクエストメソッド
    1. CONNECT
    2. DELETE
    3. GET
    4. HEAD
    5. OPTIONS
    6. PATCH
    7. POST
    8. PUT
    9. TRACE
  20. HTTP レスポンスステータスコード
    1. 100 Continue
    2. 101 Switching Protocols
    3. 102 Processing
    4. 103 Early Hints
    5. 200 OK
    6. 201 Created
    7. 202 Accepted
    8. 203 Non-Authoritative Information
    9. 204 No Content
    10. 205 Reset Content
    11. 206 Partial Content
    12. 207 Multi-Status
    13. 208 Already Reported
    14. 226 IM Used
    15. 300 Multiple Choices
    16. 301 Moved Permanently
    17. 302 Found
    18. 303 See Other
    19. 304 Not Modified
    20. 307 Temporary Redirect
    21. 308 Permanent Redirect
    22. 400 Bad Request
    23. 401 Unauthorized
    24. 402 Payment Required
    25. 403 Forbidden
    26. 404 Not Found
    27. 405 Method Not Allowed
    28. 406 Not Acceptable
    29. 407 Proxy Authentication Required
    30. 408 Request Timeout
    31. 409 Conflict
    32. 410 Gone
    33. 411 Length Required
    34. 412 Precondition Failed
    35. 413 Payload Too Large
    36. 414 URI Too Long
    37. 415 Unsupported Media Type
    38. 416 Range Not Satisfiable
    39. 417 Expectation Failed
    40. 418 I'm a teapot
    41. 421 Misdirected Request
    42. 422 Unprocessable Entity
    43. 423 Locked
    44. 424 Failed Dependency
    45. 425 Too Early
    46. 426 Upgrade Required
    47. 428 Precondition Required
    48. 429 Too Many Requests
    49. 431 Request Header Fields Too Large
    50. 451 Unavailable For Legal Reasons
    51. 500 Internal Server Error
    52. 501 Not Implemented
    53. 502 Bad Gateway
    54. 503 Service Unavailable
    55. 504 Gateway Timeout
    56. 505 HTTP Version Not Supported
    57. 506 Variant Also Negotiates
    58. 507 Insufficient Storage
    59. 508 Loop Detected
    60. 510 Not Extended
    61. 511 Network Authentication Required
  21. CSP ディレクティブ
    1. CSP ソース値
    2. CSP: base-uri
    3. CSP: block-all-mixed-content 非推奨;
    4. CSP: child-src
    5. CSP: connect-src
    6. CSP: default-src
    7. CSP: fenced-frame-src Experimental
    8. CSP: font-src
    9. CSP: form-action
    10. CSP: frame-ancestors
    11. CSP: frame-src
    12. CSP: img-src
    13. CSP: manifest-src
    14. CSP: media-src
    15. CSP: object-src
    16. CSP: prefetch-src 非標準 非推奨;
    17. CSP: report-to
    18. CSP: report-uri 非推奨;
    19. CSP: require-trusted-types-for Experimental
    20. CSP: sandbox
    21. CSP: script-src
    22. CSP: script-src-attr
    23. CSP: script-src-elem
    24. CSP: style-src
    25. CSP: style-src-attr
    26. CSP: style-src-elem
    27. CSP: trusted-types Experimental
    28. CSP: upgrade-insecure-requests
    29. CSP: worker-src
  22. CORS エラー
    1. Reason: CORS disabled
    2. Reason: CORS header 'Access-Control-Allow-Origin' does not match 'xyz'
    3. Reason: CORS header 'Access-Control-Allow-Origin' missing
    4. Reason: CORS header 'Origin' cannot be added
    5. Reason: CORS preflight channel did not succeed
    6. Reason: CORS request did not succeed
    7. Reason: CORS request external redirect not allowed
    8. Reason: CORS request not HTTP
    9. Reason: Credential is not supported if the CORS header 'Access-Control-Allow-Origin' is '*'
    10. Reason: Did not find method in CORS header 'Access-Control-Allow-Methods'
    11. Reason: expected 'true' in CORS header 'Access-Control-Allow-Credentials'
    12. Reason: invalid token 'xyz' in CORS header 'Access-Control-Allow-Headers'
    13. Reason: invalid token 'xyz' in CORS header 'Access-Control-Allow-Methods'
    14. Reason: missing token ‘xyz’ in CORS header ‘Access-Control-Allow-Headers’ from CORS preflight channel
    15. Reason: Multiple CORS header 'Access-Control-Allow-Origin' not allowed
  23. 機能ポリシーディレクティブ
    1. Feature-Policy: accelerometer Experimental
    2. Feature-Policy: ambient-light-sensor Experimental
    3. Permissions-Policy: attribution-reporting Experimental
    4. Feature-Policy: autoplay Experimental
    5. Permissions-Policy: bluetooth Experimental
    6. Permissions-Policy: browsing-topics Experimental 非標準
    7. Feature-Policy: camera
    8. Permissions-Policy: compute-pressure Experimental
    9. Feature-Policy: display-capture
    10. Feature-Policy: document-domain Experimental
    11. Feature-Policy: encrypted-media Experimental
    12. Feature-Policy: fullscreen
    13. Permissions-Policy: gamepad Experimental
    14. Feature-Policy: geolocation
    15. Permissions-Policy: gyroscope Experimental
    16. Permissions-Policy: hid Experimental
    17. Permissions-Policy: identity-credentials-get Experimental
    18. Permissions-Policy: idle-detection Experimental
    19. Permissions-Policy: local-fonts Experimental
    20. Permissions-Policy: magnetometer Experimental
    21. Feature-Policy: microphone
    22. Feature-Policy: midi Experimental
    23. Permissions-Policy: otp-credentials Experimental
    24. Feature-Policy: payment Experimental
    25. Permissions-Policy: picture-in-picture Experimental
    26. Permissions-Policy: publickey-credentials-create Experimental
    27. Permissions-Policy: publickey-credentials-get
    28. Feature-Policy: screen-wake-lock
    29. Permissions-Policy: serial Experimental
    30. Permissions-Policy: speaker-selection Experimental
    31. Permissions-Policy: storage-access Experimental
    32. Permissions-Policy: usb Experimental
    33. Feature-Policy: web-share
    34. Permissions-Policy: window-management Experimental
    35. Feature-Policy: xr-spatial-tracking Experimental

この記事では

  • 構文
  • 仕様書
  • 関連情報

NEL

HTTP の NEL レスポンスヘッダーは、ネットワークリクエストログ記録を構成するために使用されます。

ヘッダー種別 レスポンスヘッダー
禁止ヘッダー名 いいえ

構文

NEL: { "report_to": "name_of_reporting_group", "max_age": 12345, "include_subdomains": false, "success_fraction": 0.0, "failure_fraction": 1.0 }

仕様書

仕様書
Network Error Logging

関連情報

  • Network Error Logging (NEL) の説明

Help improve MDN

Learn how to contribute.

This page was last modified on 2022年9月28日 by MDN contributors.

View this page on GitHub • Report a problem with this content
MDN logo

Your blueprint for a better internet.

  • MDN on Mastodon
  • MDN on X (formerly Twitter)
  • MDN on GitHub
  • MDN Blog RSS Feed

MDN

  • About
  • Blog
  • Careers
  • Advertise with us

Support

  • Product help
  • Report an issue

Our communities

  • MDN Community
  • MDN Forum
  • MDN Chat

Developers

  • Web Technologies
  • Learn Web Development
  • MDN Plus
  • Hacks Blog
Mozilla logo
  • Website Privacy Notice
  • Cookies
  • Legal
  • Community Participation Guidelines

Visit Mozilla Corporation’s not-for-profit parent, the Mozilla Foundation.
Portions of this content are ©1998–2024 by individual mozilla.org contributors. Content available under a Creative Commons license.