HTTP Status Codes List for ASP.NET Core

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Code	Name	StatusCodes	Meaning
100	Continue 1 case	`Status100Continue`	An interim response: the server has received the request headers and the client should send the body.
101	Switching Protocols 1 case	`Status101SwitchingProtocols`	The server agrees to switch protocols as the client asked in its Upgrade header, most often to WebSocket.
102	Processing	`Status102Processing`	A WebDAV interim response (RFC 2518) meaning the server is still working.
103	Early Hints		An interim response (RFC 8297) carrying Link headers so the browser can start preloading while the server prepares the real response.

Code	Name	StatusCodes	Meaning
200	OK 3 cases	`Status200OK`	The request succeeded.
201	Created 1 case	`Status201Created`	The request created a new resource.
202	Accepted 1 case	`Status202Accepted`	The request was accepted for processing that has not finished yet.
203	Non-Authoritative Information	`Status203NonAuthoritative`	The response was modified by a transforming proxy and is not exactly what the origin server sent.
204	No Content 3 cases	`Status204NoContent`	The request succeeded and there is no body.
205	Reset Content	`Status205ResetContent`	The request succeeded and the client should reset the form or view that sent it.
206	Partial Content 1 case	`Status206PartialContent`	The response contains only the byte range the client asked for with a Range header.
207	Multi-Status	`Status207MultiStatus`	A WebDAV response (RFC 4918) whose XML body contains a separate status for each of several resources.
208	Already Reported	`Status208AlreadyReported`	Used inside a WebDAV 207 response (RFC 5842) to avoid listing the same resource twice.
226	IM Used	`Status226IMUsed`	The response is the result of instance manipulations applied to the resource (RFC 3229, delta encoding).

Code	Name	StatusCodes	Meaning
300	Multiple Choices	`Status300MultipleChoices`	The resource has several representations and the client should choose one.
301	Moved Permanently 3 cases	`Status301MovedPermanently`	The resource has a new permanent URL, given in Location.
302	Found 6 cases	`Status302Found`	The resource is temporarily at another URL, given in Location.
303	See Other	`Status303SeeOther`	The result is at another URL that the client should fetch with GET, typically after a form POST (Post/Redirect/Get).
304	Not Modified 1 case	`Status304NotModified`	The cached copy the client has is still valid (its If-None-Match or If-Modified-Since matched).
305	Use Proxy	`Status305UseProxy`	Deprecated (RFC 7231) for security reasons.
306	(Unused)	`Status306SwitchProxy`	Reserved.
307	Temporary Redirect 3 cases	`Status307TemporaryRedirect`	Like 302, but the client must repeat the request with the same method and body at the new URL.
308	Permanent Redirect 2 cases	`Status308PermanentRedirect`	Like 301, but the client must keep the method and body.

Code	Name	StatusCodes	Meaning
400	Bad Request 11 cases	`Status400BadRequest`	The server will not process the request because of a client error: malformed syntax, invalid framing or, in APIs, invalid input.
401	Unauthorized 3 cases	`Status401Unauthorized`	The request lacks valid authentication.
402	Payment Required	`Status402PaymentRequired`	Reserved for future use; some APIs use it when a paid plan or credit is needed.
403	Forbidden 4 cases	`Status403Forbidden`	The server understood who the client is but refuses the request: the user is authenticated but not allowed.
404	Not Found 4 cases	`Status404NotFound`	The server has no resource at this URL, or does not want to say it has one.
405	Method Not Allowed 1 case	`Status405MethodNotAllowed`	The URL exists but not for this HTTP method.
406	Not Acceptable 2 cases	`Status406NotAcceptable`	The server cannot produce a response in any format the client listed in its Accept header.
407	Proxy Authentication Required	`Status407ProxyAuthenticationRequired`	Like 401, but the client must authenticate with a proxy (Proxy-Authenticate header).
408	Request Timeout 1 case	`Status408RequestTimeout`	The server gave up waiting for the client to finish sending the request.
409	Conflict 2 cases	`Status409Conflict`	The request conflicts with the current state of the resource, for example a duplicate or an edit conflict.
410	Gone	`Status410Gone`	The resource existed but was removed permanently, and no forwarding address is known.
411	Length Required	`Status411LengthRequired`	The server refuses a request without a Content-Length header.
412	Precondition Failed 1 case	`Status412PreconditionFailed`	A condition in the request headers (If-Match, If-Unmodified-Since) was false.
413	Content Too Large 1 case	`Status413RequestEntityTooLarge`	The request body is larger than the server will accept.
414	URI Too Long 1 case	`Status414RequestUriTooLong`	The request URL is longer than the server will process.
415	Unsupported Media Type 3 cases	`Status415UnsupportedMediaType`	The server refuses the request body's format, given by its Content-Type header.
416	Range Not Satisfiable 1 case	`Status416RequestedRangeNotSatisfiable`	The Range the client asked for is outside the resource.
417	Expectation Failed	`Status417ExpectationFailed`	The server cannot meet the Expect header of the request.
418	I'm a teapot	`Status418ImATeapot`	An April Fools' joke from RFC 2324.
419	Authentication Timeout	`Status419AuthenticationTimeout`	Not a standard code.
421	Misdirected Request	`Status421MisdirectedRequest`	The request reached a server that cannot answer for this host, typically over a reused HTTP/2 connection.
422	Unprocessable Content 1 case	`Status422UnprocessableEntity`	The body is well-formed but semantically invalid (RFC 9110, formerly WebDAV's "Unprocessable Entity").
423	Locked	`Status423Locked`	The resource is locked (WebDAV, RFC 4918).
424	Failed Dependency	`Status424FailedDependency`	The request failed because an earlier request it depended on failed (WebDAV).
425	Too Early		The server is unwilling to risk processing a request that might be replayed (RFC 8470).
426	Upgrade Required	`Status426UpgradeRequired`	The server refuses the request over the current protocol and says which one to use in an Upgrade header.
428	Precondition Required	`Status428PreconditionRequired`	The server requires the request to be conditional (RFC 6585), usually to force If-Match on updates and prevent lost updates.
429	Too Many Requests 2 cases	`Status429TooManyRequests`	The client sent too many requests in a given time (RFC 6585).
431	Request Header Fields Too Large 1 case	`Status431RequestHeaderFieldsTooLarge`	The request headers, or one header, are too large (RFC 6585).
451	Unavailable For Legal Reasons	`Status451UnavailableForLegalReasons`	The resource is blocked for legal reasons, such as a court order (RFC 7725).
499	Client Closed Request	`Status499ClientClosedRequest`	Not a standard code.

Code	Name	StatusCodes	Meaning
500	Internal Server Error 5 cases	`Status500InternalServerError`	The server hit an unexpected condition, typically an unhandled exception.
501	Not Implemented	`Status501NotImplemented`	The server does not support the functionality needed, such as an unknown method.
502	Bad Gateway	`Status502BadGateway`	A gateway or proxy got an invalid response from the server behind it.
503	Service Unavailable 2 cases	`Status503ServiceUnavailable`	The server cannot handle the request right now, because of overload or maintenance.
504	Gateway Timeout	`Status504GatewayTimeout`	A gateway or proxy did not get a response from the server behind it in time.
505	HTTP Version Not Supported 1 case	`Status505HttpVersionNotsupported`	The server does not support the HTTP version of the request.
506	Variant Also Negotiates	`Status506VariantAlsoNegotiates`	A content negotiation configuration error on the server (RFC 2295).
507	Insufficient Storage	`Status507InsufficientStorage`	The server cannot store what the request needs (WebDAV).
508	Loop Detected	`Status508LoopDetected`	The server found an infinite loop while processing the request (WebDAV, RFC 5842).
510	Not Extended	`Status510NotExtended`	Further extensions are required (RFC 2774, now historic).
511	Network Authentication Required	`Status511NetworkAuthenticationRequired`	The client must authenticate to gain network access, as with a hotel or airport captive portal (RFC 6585).
520	Web Server Returned an Unknown Error		Not a standard code.
522	Connection Timed Out		Not a standard code.

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HTTP Status Codes in ASP.NET Core

The surprises

1xx Informational

2xx Success

3xx Redirection

4xx Client error

5xx Server error

Returning a status code

Empty error bodies

HttpClient and status codes

Defaults worth knowing

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