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HTTP协议的 510 Not Extended 响应状态码在HTTP扩展框架协议（参见RFC 2774）中发送。
在HTTP扩展框架协议中 ，一个客户端可以发送一个包含扩展声明的请求，该声明描述了要使用的扩展。如果服务器接收到这样的请求，但是请求不支持任何所描述的扩展，那么服务器将使用510状态码进行响应。
510 Not Extended
| Specification | Title |
|---|---|
| RFC 2774, section 7: 510 Not Extended | An HTTP Extension Framework |
AcceptAccept-CHAccept-CH-LifetimeAccept-CharsetAccept-EncodingAccept-LanguageAccept-PatchAccept-RangesAccess-Control-Allow-CredentialsAccess-Control-Allow-HeadersAccess-Control-Allow-MethodsAccess-Control-Allow-OriginAccess-Control-Expose-HeadersAccess-Control-Max-AgeAccess-Control-Request-HeadersAccess-Control-Request-MethodAgeAllowAlt-SvcAuthorizationCache-ControlClear-Site-DataConnectionContent-DispositionContent-EncodingContent-LanguageContent-LengthContent-LocationContent-RangeContent-Security-PolicyContent-Security-Policy-Report-OnlyContent-TypeCookieCookie2Cross-Origin-Resource-PolicyDNTDPRDateDevice-Memory [我来译!]DigestETagEarly-DataExpectExpect-CTExpiresFeature-PolicyForwardedFromHostIf-MatchIf-Modified-SinceIf-None-MatchIf-RangeIf-Unmodified-SinceIndexKeep-AliveLarge-AllocationLast-ModifiedLinkLocationOriginPragmaProxy-AuthenticateProxy-AuthorizationPublic-Key-PinsPublic-Key-Pins-Report-OnlyRangeRefererReferrer-PolicyRetry-AfterSave-DataSec-WebSocket-AcceptServerServer-TimingSet-CookieSet-Cookie2SourceMapHTTP Strict Transport SecurityTETiming-Allow-OriginTkTrailerTransfer-EncodingUpgrade-Insecure-RequestsUser-AgentVaryViaWWW-AuthenticateWant-Digest [我来译!]WarningX-Content-Type-OptionsX-DNS-Prefetch-ControlX-Forwarded-ForX-Forwarded-HostX-Forwarded-ProtoX-Frame-OptionsX-XSS-Protection100 Continue101 Switching Protocol103 Early Hints200 OK201 Created202 Accepted203 Non-Authoritative Information204 No Content205 Reset Content206 Partial Content300 Multiple Choices301 Moved Permanently302 Found303 See Other304 Not Modified307 Temporary Redirect308 Permanent Redirect400 Bad Request401 Unauthorized402 Payment Required403 Forbidden404 Not Found405 Method Not Allowed406 Not Acceptable407 Proxy Authentication Required408 Request Timeout409 Conflict410 Gone411 Length Required412 Precondition Failed413 Payload Too Large414 URI Too Long415 Unsupported Media Type416 Range Not Satisfiable417 Expectation Failed418 I'm a teapot422 Unprocessable Entity425 Too Early426 Upgrade Required428 Precondition Required429 Too Many Requests431 Request Header Fields Too Large451 Unavailable For Legal Reasons500 Internal Server Error501 Not Implemented502 Bad Gateway503 Service Unavailable504 Gateway Timeout505 HTTP Version Not Supported506 Variant Also Negotiates [我来译!]507 Insufficient Storage [我来译!]508 Loop Detected [我来译!]510 Not Extended [我来译!]511 Network Authentication RequiredCSP: base-uriCSP: block-all-mixed-contentCSP: child-srcCSP: connect-srcCSP: default-srcCSP: font-srcCSP: form-actionCSP: frame-ancestorsCSP: frame-src [我来译!]CSP: img-src [我来译!]CSP: manifest-src [我来译!]CSP: media-src [我来译!]CSP: navigate-to [我来译!]CSP: object-src [我来译!]CSP: plugin-types [我来译!]CSP: prefetch-src [我来译!]CSP: referrer [我来译!]report-toCSP: report-uri [我来译!]CSP: require-sri-forCSP: sandboxCSP: script-src [我来译!]CSP: script-src-attr [我来译!]CSP: script-src-elem [我来译!]CSP: style-src [我来译!]CSP: style-src-attr [我来译!]CSP: style-src-elem [我来译!]CSP: trusted-types [我来译!]CSP: upgrade-insecure-requestsCSP: worker-src [我来译!]登录以获得 MDN 账户的好处。若您尚未创建账户，将在登录后看到该操作提示。