GuidesAccess control CORSAuthenticationBrowser detection using the user agentCachingCaching FAQCompressionConditional requestsConnection management in HTTP 1.xContent negotiationContent negotiation: List of default Accept valuesCookiesCSPMessagesOverviewProtocol upgrade mechanismProxy servers and tunnelingProxy servers and tunneling: Proxy Auto-Configuration (PAC) filePublic Key PinningRange requestsRedirectionsResources and specificationsResources and URIsResponse codesServer-Side Access ControlSessionGuides: BasicsBasics of HTTPChoosing between www and non-www URLsData URIsEvolution of HTTPIdentifying resources on the WebMIME TypesMIME types: Complete list of MIME typesCSPContent-Security-PolicyContent-Security-Policy-Report-OnlyCSP: base-uriCSP: block-all-mixed-contentCSP: child-srcCSP: connect-srcCSP: default-srcCSP: font-srcCSP: form-actionCSP: frame-ancestorsCSP: frame-srcCSP: img-srcCSP: manifest-srcCSP: media-srcCSP: object-srcCSP: plugin-typesCSP: referrerCSP: report-uriCSP: require-sri-forCSP: sandboxCSP: script-srcCSP: style-srcCSP: upgrade-insecure-requestsCSP: worker-srcHeadersAcceptAccept-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-TypeCookieCookie2DateDNTETagExpectExpiresForwardedFromHeadersHostIf-MatchIf-Modified-SinceIf-None-MatchIf-RangeIf-Unmodified-SinceKeep-AliveLarge-AllocationLast-ModifiedLocationOriginPragmaProxy-AuthenticateProxy-AuthorizationPublic-Key-PinsPublic-Key-Pins-Report-OnlyRangeRefererReferrer-PolicyRetry-AfterServerSet-CookieSet-Cookie2SourceMapStrict-Transport-SecurityTETkTrailerTransfer-EncodingUpgrade-Insecure-RequestsUser-AgentUser-Agent: FirefoxVaryViaWarningWWW-AuthenticateX-Content-Type-OptionsX-DNS-Prefetch-ControlX-Forwarded-ForX-Forwarded-HostX-Forwarded-ProtoX-Frame-OptionsX-XSS-ProtectionMethodsCONNECTDELETEGETHEADMethodsOPTIONSPATCHPOSTPUTStatus100 Continue101 Switching Protocols200 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 Unauthorized403 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 Failed426 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 Supported511 Network Authentication RequiredStatus
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HTTP 401 Unauthorized客户端错误状态响应代码指示该请求尚未应用，因为它缺少目标资源的有效认证凭证。
此状态与包含有关如何正确授权信息的WWW-Authenticate标头一起发送。
这种状态与此类似403，但在这种情况下，身份验证是可能的。
状态
401 Unauthorized
响应示例
HTTP/1.1 401 Unauthorized Date: Wed, 21 Oct 2015 07:28:00 GMT WWW-Authenticate: Basic realm="Access to staging site"
规范
规范 | 标题 |
|---|---|
RFC 7235，第3.1节：401未经授权 | HTTP / 1.1：认证 |
浏览器兼容性
Feature | Chrome | Firefox | Edge | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
Basic Support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
Feature | Android | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
|---|---|---|---|---|---|---|---|
Basic Support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
也可以看看
HTTP 认证
WWW-Authenticate
Authorization
Proxy-Authorization
Proxy-Authenticate
403,407