在 HTTP 协议中，响应状态码 203 Non-Authoritative Information 表示请求已经成功被响应，但是获得的负载与源头服务器的状态码为 200 (OK)的响应相比，经过了拥有转换功能的 proxy （代理服务器）的修改。
The 203 状态码有点类似于 Warning 首部的 214（Transformation Applied）警告码，后者的优势在于可以应用于任何状态码的响应之中。
203 Non-Authoritative Information
| Specification | Title |
|---|---|
| RFC 7231, section 6.3.4: 203 Non-Authoritative Information | Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content |
AcceptAccept-CharsetAccept-EncodingAccept-LanguageAccept-RangesAccess-Control-Allow-CredentialsAccess-Control-Allow-HeadersAccess-Control-Allow-MethodsAccess-Control-Allow-OriginAccess-Control-Expose-HeadersAccess-Control-Max-AgeAccess-Control-Request-HeadersAccess-Control-Request-MethodAgeAllowAuthorizationCache-ControlConnectionContent-DispositionContent-EncodingContent-LanguageContent-LengthContent-LocationContent-RangeContent-Security-PolicyContent-Security-Policy-Report-Only [我来译!]Content-TypeCookieCookie2DNTDateETagExpectExpiresForwardedFromHostIf-MatchIf-Modified-SinceIf-None-MatchIf-RangeIf-Unmodified-SinceKeep-AliveLarge-Allocation [我来译!]Last-ModifiedLocationOriginPragmaProxy-AuthenticateProxy-AuthorizationPublic-Key-PinsPublic-Key-Pins-Report-Only [我来译!]RangeRefererReferrer-PolicyRetry-AfterServerSet-CookieSet-Cookie2SourceMap [我来译!]HTTP Strict Transport SecurityTETk [我来译!]TrailerTransfer-EncodingUpgrade-Insecure-RequestsUser-AgentVaryViaWWW-AuthenticateWarningX-Content-Type-OptionsDNS 预读取X-Forwarded-ForX-Forwarded-HostX-Forwarded-ProtoX-Frame-Options 响应头X-XSS-Protection100 Continue101 Switching Protocol200 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 Unauthorized [我来译!]403 Forbidden [我来译!]404 Not Found [我来译!]405 Method Not Allowed406 Not Acceptable407 Proxy Authentication Required [我来译!]408 Request Timeout [我来译!]409 Conflict [我来译!]410 Gone411 Length Required [我来译!]412 Precondition Failed（先决条件失败）413 Payload Too Large [我来译!]414 URI Too Long [我来译!]415 Unsupported Media Type [我来译!]416 Range Not Satisfiable417 Expectation Failed426 Upgrade Required [我来译!]428 Precondition Required429 Too Many Requests431 Request Header Fields Too Large [我来译!]451 Unavailable For Legal Reasons [我来译!]500 Internal Server Error [我来译!]501 Not Implemented502 Bad Gateway [我来译!]503 Service Unavailable [我来译!]504 Gateway Timeout [我来译!]505 HTTP Version Not Supported [我来译!]511 Network Authentication Required [我来译!]CSP: base-uri [我来译!]CSP: block-all-mixed-content [我来译!]CSP: child-src [我来译!]CSP: connect-src [我来译!]CSP: default-src [我来译!]CSP: font-src [我来译!]CSP: form-action [我来译!]CSP: frame-ancestors [我来译!]CSP: frame-src [我来译!]CSP: img-src [我来译!]CSP: manifest-src [我来译!]CSP: media-src [我来译!]CSP: object-src [我来译!]CSP: plugin-types [我来译!]CSP: referrer [我来译!]CSP: report-uri [我来译!]CSP: require-sri-for [我来译!]CSP: sandbox [我来译!]CSP: script-src [我来译!]CSP: style-src [我来译!]CSP: upgrade-insecure-requests [我来译!]CSP: worker-src [我来译!]