User:Netjeff/List of HTTP status codes (draft)

Security access control methods

Security vulnerabilities

Hypertext Transfer Protocol (HTTP) response status codes. Status codes are issued by a server in response to a client's request made to the server. It includes codes from IETF Request for Comments

(RFCs), other specifications, and some additional codes used in some common applications of the HTTP. The first digit of the status code specifies one of five standard classes of responses. The optional message phrases shown are typical, but any human-readable alternative may be provided, or none at all.

Unless otherwise stated, the status code is part of the HTTP standard (

RFC 9110

The Internet Assigned Numbers Authority (IANA) maintains the official registry of HTTP status codes.^[1]

All HTTP response status codes are separated into five classes or categories. The first digit of the status code defines the class of response, while the last two digits do not have any classifying or categorization role. There are five classes defined by the standard:

1xx informational response – the request was received, continuing process
2xx successful – the request was successfully received, understood, and accepted
3xx redirection – further action needs to be taken in order to complete the request
4xx client error – the request contains bad syntax or cannot be fulfilled
5xx server error – the server failed to fulfil an apparently valid request

1xx informational response

An informational response indicates that the request was received and understood. It is issued on a provisional basis while request processing continues. It alerts the client to wait for a final response. The message consists only of the status line and optional header fields, and is terminated by an empty line. As the HTTP/1.0 standard did not define any 1xx status codes, servers must not^{[note 1]} send a 1xx response to an HTTP/1.0 compliant client except under experimental conditions.

100 Continue: The server has received the request headers and the client should proceed to send the request body (in the case of a request for which a body needs to be sent; for example, a POST request). Sending a large request body to a server after a request has been rejected for inappropriate headers would be inefficient. To have a server check the request's headers, a client must send Expect: 100-continue as a header in its initial request and receive a 100 Continue status code in response before sending the body. If the client receives an error code such as 403 (Forbidden) or 405 (Method Not Allowed) then it should not send the request's body. The response 417 Expectation Failed indicates that the request should be repeated without the Expect header as it indicates that the server does not support expectations (this is the case, for example, of HTTP/1.0 servers).^[2]
101 Switching Protocols: The requester has asked the server to switch protocols and the server has agreed to do so.
102 Processing (WebDAV; RFC 2518): A WebDAV request may contain many sub-requests involving file operations, requiring a long time to complete the request. This code indicates that the server has received and is processing the request, but no response is available yet.^[3] This prevents the client from timing out and assuming the request was lost.
103 Early Hints (RFC 8297): Used to return some response headers before final HTTP message.^[4]

2xx success

This class of status codes indicates the action requested by the client was received, understood, and accepted.^[1]

200 OK: Standard response for successful HTTP requests. The actual response will depend on the request method used. In a GET request, the response will contain an entity corresponding to the requested resource. In a POST request, the response will contain an entity describing or containing the result of the action.
201 Created: The request has been fulfilled, resulting in the creation of a new resource.^[5]
202 Accepted: The request has been accepted for processing, but the processing has not been completed. The request might or might not be eventually acted upon, and may be disallowed when processing occurs.
203 Non-Authoritative Information (since HTTP/1.1): The server is a transforming proxy (e.g. a Web accelerator) that received a 200 OK from its origin, but is returning a modified version of the origin's response.^[6]^[7]
204 No Content: The server successfully processed the request, and is not returning any content.
205 Reset Content: The server successfully processed the request, asks that the requester reset its document view, and is not returning any content.
206 Partial Content: The server is delivering only part of the resource (byte serving) due to a range header sent by the client. The range header is used by HTTP clients to enable resuming of interrupted downloads, or split a download into multiple simultaneous streams.
207 Multi-Status (WebDAV; RFC 4918): The message body that follows is by default an XML message and can contain a number of separate response codes, depending on how many sub-requests were made.^[8]
208 Already Reported (WebDAV; RFC 5842): The members of a DAV binding have already been enumerated in a preceding part of the (multistatus) response, and are not being included again.
226 IM Used (RFC 3229): The server has fulfilled a request for the resource, and the response is a representation of the result of one or more instance-manipulations applied to the current instance.^[9]

3xx redirection

This class of status code indicates the client must take additional action to complete the request. Many of these status codes are used in URL redirection.^[1]

A user agent may carry out the additional action with no user interaction only if the method used in the second request is GET or HEAD. A user agent may automatically redirect a request. A user agent should detect and intervene to prevent cyclical redirects.^[10]

300 Multiple Choices: Indicates multiple options for the resource from which the client may choose (via agent-driven content negotiation). For example, this code could be used to present multiple video format options, to list files with different filename extensions, or to suggest word-sense disambiguation.
301 Moved Permanently: This and all future requests should be directed to the given
URI
.
302 Found (Previously "Moved temporarily"): Tells the client to look at (browse to) another URL. The HTTP/1.0 specification (RFC 1945) required the client to perform a temporary redirect with the same method (the original describing phrase was "Moved Temporarily"),^[11] but popular browsers implemented 302 redirects by changing the method to GET. Therefore, HTTP/1.1 added status codes 303 and 307 to distinguish between the two behaviours.^[10]
303 See Other (since HTTP/1.1): The response to the request can be found under another URI using the GET method. When received in response to a POST (or PUT/DELETE), the client should presume that the server has received the data and should issue a new GET request to the given URI.
304 Not Modified: Indicates that the resource has not been modified since the version specified by the request headers If-Modified-Since or If-None-Match. In such case, there is no need to retransmit the resource since the client still has a previously-downloaded copy.
305 Use Proxy (since HTTP/1.1): The requested resource is available only through a proxy, the address for which is provided in the response. For security reasons, many HTTP clients (such as Mozilla Firefox and Internet Explorer) do not obey this status code.^[12]
306 Switch Proxy: No longer used. Originally meant "Subsequent requests should use the specified proxy."
307 Temporary Redirect (since HTTP/1.1): In this case, the request should be repeated with another URI; however, future requests should still use the original URI. In contrast to how 302 was historically implemented, the request method is not allowed to be changed when reissuing the original request. For example, a POST request should be repeated using another POST request.
308 Permanent Redirect: This and all future requests should be directed to the given
URI
. 308 parallel the behaviour of 301, but does not allow the HTTP method to change. So, for example, submitting a form to a permanently redirected resource may continue smoothly.

4xx client errors

This class of status code is intended for situations in which the error seems to have been caused by the client. Except when responding to a HEAD request, the server should include an entity containing an explanation of the error situation, and whether it is a temporary or permanent condition. These status codes are applicable to any request method. User agents should display any included entity to the user.

400 Bad Request: The server cannot or will not process the request due to an apparent client error (e.g., malformed request syntax, size too large, invalid request message framing, or deceptive request routing).
401 Unauthorized: Similar to 403 Forbidden, but specifically for use when authentication is required and has failed or has not yet been provided. The response must include a WWW-Authenticate header field containing a challenge applicable to the requested resource. See Basic access authentication and Digest access authentication. 401 semantically means "unauthorised", the user does not have valid authentication credentials for the target resource.; Note: Some sites incorrectly issue HTTP 401 when an IP address is banned from the website (usually the website domain) and that specific address is refused permission to access a website.^{[citation needed]}
402 Payment Required: Reserved for future use. The original intention was that this code might be used as part of some form of
Stripe uses this code for failed payments where parameters were correct, for example blocked fraudulent payments.^[17]
403 Forbidden: The request contained valid data and was understood by the server, but the server is refusing action. This may be due to the user not having the necessary permissions for a resource or needing an account of some sort, or attempting a prohibited action (e.g. creating a duplicate record where only one is allowed). This code is also typically used if the request provided authentication by answering the WWW-Authenticate header field challenge, but the server did not accept that authentication. The request should not be repeated.
404 Not Found: The requested resource could not be found but may be available in the future. Subsequent requests by the client are permissible.
405 Method Not Allowed: A request method is not supported for the requested resource; for example, a GET request on a form that requires data to be presented via POST, or a PUT request on a read-only resource.
406 Not Acceptable: The requested resource is capable of generating only content not acceptable according to the Accept headers sent in the request. See Content negotiation.
407 Proxy Authentication Required: The client must first authenticate itself with the proxy.
408 Request Timeout: The server timed out waiting for the request. According to HTTP specifications: "The client did not produce a request within the time that the server was prepared to wait. The client MAY repeat the request without modifications at any later time."
409 Conflict: Indicates that the request could not be processed because of conflict in the current state of the resource, such as an edit conflict between multiple simultaneous updates.
410 Gone: Indicates that the resource requested was previously in use but is no longer available and will not be available again. This should be used when a resource has been intentionally removed and the resource should be purged. Upon receiving a 410 status code, the client should not request the resource in the future. Clients such as search engines should remove the resource from their indices. Most use cases do not require clients and search engines to purge the resource, and a "404 Not Found" may be used instead.
411 Length Required: The request did not specify the length of its content, which is required by the requested resource.
412 Precondition Failed: The server does not meet one of the preconditions that the requester put on the request header fields.
413 Payload Too Large: The request is larger than the server is willing or able to process. Previously called "Request Entity Too Large" in RFC 2616.^[18]
414 URI Too Long: The
URI provided was too long for the server to process. Often the result of too much data being encoded as a query-string of a GET request, in which case it should be converted to a POST request. Called "Request-URI Too Long" previously in RFC 2616.^[19]
415 Unsupported Media Type: The request entity has a
image/svg+xml
, but the server requires that images use a different format.
416 Range Not Satisfiable: The client has asked for a portion of the file (byte serving), but the server cannot supply that portion. For example, if the client asked for a part of the file that lies beyond the end of the file. Called "Requested Range Not Satisfiable" previously RFC 2616.^[20]
417 Expectation Failed: The server cannot meet the requirements of the Expect request-header field.^[21]
418 I'm a teapot (RFC 2324, RFC 7168): This code was defined in 1998 as one of the traditional
Google.com's "I'm a teapot" easter egg.^[23]^[24]^[25]
421 Misdirected Request: The request was directed at a server that is not able to produce a response (for example because of connection reuse).
422 Unprocessable Entity (WebDAV; RFC 4918): The request was well-formed but was unable to be followed due to semantic errors.[8]
423 Locked (WebDAV; RFC 4918): The resource that is being accessed is locked.^[8]
424 Failed Dependency (WebDAV; RFC 4918): The request failed because it depended on another request and that request failed (e.g., a PROPPATCH).^[8]
425 Too Early (RFC 8470): Indicates that the server is unwilling to risk processing a request that might be replayed.
426 Upgrade Required: The client should switch to a different protocol such as
Upgrade header
field.
428 Precondition Required (RFC 6585): The origin server requires the request to be conditional. Intended to prevent the 'lost update' problem, where a client GETs a resource's state, modifies it, and PUTs it back to the server, when meanwhile a third party has modified the state on the server, leading to a conflict.^[26]
429 Too Many Requests (RFC 6585): The user has sent too many requests in a given amount of time. Intended for use with rate-limiting schemes.^[26]
431 Request Header Fields Too Large (RFC 6585): The server is unwilling to process the request because either an individual header field, or all the header fields collectively, are too large.^[26]
451 Unavailable For Legal Reasons (RFC 7725): A server operator has received a legal demand to deny access to a resource or to a set of resources that includes the requested resource.^[27] The code 451 was chosen as a reference to the novel Fahrenheit 451 (see the Acknowledgements in the RFC).

5xx server errors

The server failed to fulfil a request.

Response status codes beginning with the digit "5" indicate cases in which the server is aware that it has encountered an error or is otherwise incapable of performing the request. Except when responding to a HEAD request, the server should include an entity containing an explanation of the error situation, and indicate whether it is a temporary or permanent condition. Likewise, user agents should display any included entity to the user. These response codes are applicable to any request method.

500 Internal Server Error: A generic error message, given when an unexpected condition was encountered and no more specific message is suitable.
501 Not Implemented: The server either does not recognize the request method, or it lacks the ability to fulfil the request. Usually this implies future availability (e.g., a new feature of a web-service API).
502 Bad Gateway: The server was acting as a gateway or proxy and received an invalid response from the upstream server.
503 Service Unavailable: The server cannot handle the request (because it is overloaded or down for maintenance). Generally, this is a temporary state.^[28]
504 Gateway Timeout: The server was acting as a gateway or proxy and did not receive a timely response from the upstream server.
505 HTTP Version Not Supported: The server does not support the HTTP protocol version used in the request.
506 Variant Also Negotiates (RFC 2295): Transparent content negotiation for the request results in a circular reference.^[29]
507 Insufficient Storage (WebDAV; RFC 4918): The server is unable to store the representation needed to complete the request.^[8]
508 Loop Detected (WebDAV; RFC 5842): The server detected an infinite loop while processing the request (sent instead of 208 Already Reported).
510 Not Extended (RFC 2774): Further extensions to the request are required for the server to fulfil it.^[30]
511 Network Authentication Required (RFC 6585): The client needs to authenticate to gain network access. Intended for use by intercepting proxies used to control access to the network (e.g., "
Wi-Fi hotspot).^[26]

Notes

^ Emphasised words and phrases such as must and should represent interpretation guidelines as given by RFC 2119

References

^ ^a ^b ^c "Hypertext Transfer Protocol (HTTP) Status Code Registry". Iana.org. Archived from the original on December 11, 2011. Retrieved January 8, 2015.
^ "RFC 9110: HTTP Semantics and Content, Section 10.1.1 "Expect"".
doi:10.17487/RFC2518. RFC 2518
. Retrieved October 24, 2009.

doi:10.17487/RFC8297. RFC 8297
. Retrieved December 20, 2017.

^ Stewart, Mark; djna. "Create request with POST, which response codes 200 or 201 and content". Stack Overflow. Archived from the original on October 11, 2016. Retrieved October 16, 2015.

^ "RFC 9110: HTTP Semantics and Content, Section 15.3.4".

^ "RFC 9110: HTTP Semantics and Content, Section 7.7".

^
doi:10.17487/RFC4918. RFC 4918
. Retrieved October 24, 2009.

doi:10.17487/RFC3229. RFC 3229
. Retrieved February 25, 2011.

^ ^a ^b "RFC 9110: HTTP Semantics and Content, Section 15.4 "Redirection 3xx"".

doi:10.17487/RFC1945. RFC 1945
. Retrieved October 24, 2009.

^ "Mozilla Bugzilla Bug 187996: Strange behavior on 305 redirect, comment 13". March 3, 2003. Archived from the original on April 21, 2014. Retrieved May 21, 2009.

^ "The GNU Taler tutorial for PHP Web shop developers 0.4.0". docs.taler.net. Archived from the original on November 8, 2017. Retrieved October 29, 2017.

^ "Google API Standard Error Responses". 2016. Archived from the original on May 25, 2017. Retrieved June 21, 2017.

^ "Sipgate API Documentation". Archived from the original on July 10, 2018. Retrieved July 10, 2018.

^ "Shopify Documentation". Archived from the original on July 25, 2018. Retrieved July 25, 2018.

^ "Stripe API Reference – Errors". stripe.com. Retrieved October 28, 2019.

^ "RFC2616 on status 413". Tools.ietf.org. Archived from the original on March 7, 2011. Retrieved November 11, 2015.

^ "RFC2616 on status 414". Tools.ietf.org. Archived from the original on March 7, 2011. Retrieved November 11, 2015.

^ "RFC2616 on status 416". Tools.ietf.org. Archived from the original on March 7, 2011. Retrieved November 11, 2015.

^ TheDeadLike. "HTTP/1.1 Status Codes 400 and 417, cannot choose which". serverFault. Archived from the original on October 10, 2015. Retrieved October 16, 2015.

doi:10.17487/RFC2324. RFC 2324
. Any attempt to brew coffee with a teapot should result in the error code "418 I'm a teapot". The resulting entity body MAY be short and stout.

^ I'm a teapot

^ Barry Schwartz (August 26, 2014). "New Google Easter Egg For SEO Geeks: Server Status 418, I'm A Teapot". Search Engine Land. Archived from the original on November 15, 2015. Retrieved November 4, 2015.

^ "Google's Teapot". Retrieved October 23, 2017.^{[dead link]}

^ ^a ^b ^c ^d Nottingham, M.; Fielding, R. (April 2012). "RFC 6585 – Additional HTTP Status Codes". Request for Comments. Internet Engineering Task Force. Archived from the original on May 4, 2012. Retrieved May 1, 2012.

^ Bray, T. (February 2016). "An HTTP Status Code to Report Legal Obstacles". ietf.org. Archived from the original on March 4, 2016. Retrieved March 7, 2015.

^ alex. "What is the correct HTTP status code to send when a site is down for maintenance?". Stack Overflow. Archived from the original on October 11, 2016. Retrieved October 16, 2015.

doi:10.17487/RFC2295. RFC 2295
. Retrieved October 24, 2009.

doi:10.17487/RFC2774. RFC 2774
. Retrieved October 24, 2009.

External links

Wikimedia Commons has media related to HTTP status codes.

"RFC 9110: HTTP Semantics and Content, Section 15 "Status Codes"".

Hypertext Transfer Protocol (HTTP) Status Code Registry

Microsoft Knowledge Base: MSKB943891: The HTTP status codes in IIS 7.0

Microsoft Office Knowledge Base: Error Code 2–11

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