The HTTP 409 Conflict response status code indicates a request conflict with current state of the target resource.
Conflicts are most likely to occur in response to a PUT request. For example, you may get a 409 response when uploading a file which is older than the one already on the server resulting in a version control conflict.
409 Conflict
| Specification | Title |
|---|---|
| RFC 7231, section 6.5.8: 409 Conflict | Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content |
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-Embedder-PolicyCross-Origin-Opener-PolicyCross-Origin-Resource-PolicyDNTDPRDateDevice-MemoryDigestETagEarly-DataExpectExpect-CTExpiresFeature-PolicyForwardedFromHostIf-MatchIf-Modified-SinceIf-None-MatchIf-RangeIf-Unmodified-SinceIndexKeep-AliveLarge-AllocationLast-ModifiedLinkLocationNELOriginPragmaProxy-AuthenticateProxy-AuthorizationPublic-Key-PinsPublic-Key-Pins-Report-OnlyRangeRefererReferrer-PolicyRetry-AfterSave-DataSec-Fetch-DestSec-Fetch-ModeSec-Fetch-SiteSec-Fetch-UserSec-WebSocket-AcceptServerServer-TimingSet-CookieSet-Cookie2SourceMapStrict-Transport-SecurityTETiming-Allow-OriginTkTrailerTransfer-EncodingUpgrade-Insecure-RequestsUser-AgentVaryViaWWW-AuthenticateWant-DigestWarningX-Content-Type-OptionsX-DNS-Prefetch-ControlX-Forwarded-ForX-Forwarded-HostX-Forwarded-ProtoX-Frame-OptionsX-XSS-Protection100 Continue101 Switching Protocols103 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 Negotiates507 Insufficient Storage508 Loop Detected510 Not Extended511 Network Authentication RequiredCSP: 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: navigate-toCSP: object-srcCSP: plugin-typesCSP: prefetch-srcCSP: referrerCSP: report-toCSP: report-uriCSP: require-sri-forCSP: sandboxCSP: script-srcCSP: script-src-attrCSP: script-src-elemCSP: style-srcCSP: style-src-attrCSP: style-src-elemCSP: trusted-typesCSP: upgrade-insecure-requestsCSP: worker-srcSign in to enjoy the benefits of an MDN account. If you haven’t already created an account, you will be prompted to do so after signing in.