View source for List of HTTP status codes

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{{HTTP}}
[[Hypertext Transfer Protocol]] (HTTP) response status codes are issued by a server in response to a [[Client (computing)|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.{{Ref RFC|9110}}

The [[Internet Assigned Numbers Authority]] (IANA) maintains the official registry of HTTP status codes.<ref name="iana_status_codes">{{cite web|url=https://www.iana.org/assignments/http-status-codes/|title=Hypertext Transfer Protocol (HTTP) Status Code Registry|publisher=Iana.org|access-date=January 8, 2015|archive-url=https://web.archive.org/web/20111211100506/https://www.iana.org/assignments/http-status-codes|archive-date=December 11, 2011|url-status=live}}</ref>

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 {{em|must not}}<ref group="note">Emphasised words and phrases such as {{em|must}} and {{em|should}} represent interpretation guidelines as given by {{IETF RFC|2119}}</ref> send a 1xx response to an HTTP/1.0 compliant client except under experimental conditions.

;{{anchor|100}}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 (HTTP)|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 <code>Expect: 100-continue</code> as a header in its initial request and receive a <code>100 Continue</code> 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 <code>417 Expectation Failed</code> indicates that the request should be repeated without the <code>Expect</code> header as it indicates that the server does not support expectations (this is the case, for example, of HTTP/1.0 servers).{{Ref RFC|9110|rsection=10.1.1}}
;{{anchor|101}}101 Switching Protocols
: The requester has asked the server to switch protocols and the server has agreed to do so.
;{{anchor|102}}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.{{Ref RFC|2518}} This prevents the client from timing out and assuming the request was lost. The status code is deprecated.<ref>{{cite web |title=102 Processing – HTTP MDN |date=July 25, 2023 |url=https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/102 |language=en-US}} 102 status code is deprecated</ref>
;{{anchor|103}}103 Early Hints (RFC 8297)
:Used to return some response headers before final HTTP message.{{Ref RFC|8297}}

== 2xx success ==
This class of status codes indicates the action requested by the client was received, understood, and accepted.<ref name="iana_status_codes" />

;{{anchor|200}}200 OK
: Standard response for successful HTTP requests. The actual response will depend on the [[HTTP#Request methods|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.
;{{anchor|201}}201 Created
: The request has been fulfilled, resulting in the creation of a new resource.<ref>{{cite web|last1=Stewart|first1=Mark|last2=djna|title=Create request with POST, which response codes 200 or 201 and content|url=https://stackoverflow.com/questions/1860645/create-request-with-post-which-response-codes-200-or-201-and-content|website=Stack Overflow|access-date=16 October 2015|archive-url=https://web.archive.org/web/20161011010658/https://stackoverflow.com/questions/1860645/create-request-with-post-which-response-codes-200-or-201-and-content|archive-date=October 11, 2016|url-status=live}}</ref>
;{{anchor|202}}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.
;{{anchor|203}}203 Non-Authoritative Information (since HTTP/1.1)
: The server is a transforming proxy (e.g. a {{em|[[Web accelerator]]}}) that received a 200 OK from its origin, but is returning a modified version of the origin's response.{{Ref RFC|9110|rsection=15.3.4}}{{Ref RFC|9110|rsection=7.7}}
;{{anchor|204}}204 No Content
: The server successfully processed the request, and is not returning any content.
;{{anchor|205}}205 Reset Content
: The server successfully processed the request, asks that the requester reset its document view, and is not returning any content.
;{{anchor|206}}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.
;{{anchor|207}}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.{{Ref RFC|4918}}
;{{anchor|208}}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.
;{{anchor|226}}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.{{Ref RFC|3229}}

== 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]].<ref name="iana_status_codes" />

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.{{Ref RFC|9110|rsection=15.4}}

;{{anchor|300}}300 Multiple Choices
: Indicates multiple options for the resource from which the client may choose (via [[content negotiation#Agent-driven|agent-driven content negotiation]]). For example, this code could be used to present multiple video format options, to list files with different [[filename extension]]s, or to suggest [[word-sense disambiguation]].
;{{anchor|301}}[[HTTP 301|301 Moved Permanently]]
: This and all future requests should be directed to the given [[Uniform resource identifier|URI]].
;{{anchor|302}}[[HTTP 302|302 Found (Previously "Moved temporarily")]]
: Tells the client to look at (browse to) another URL. The HTTP/1.0 specification required the client to perform a temporary redirect with the same method (the original describing phrase was "Moved Temporarily"),{{Ref RFC|1945}} 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.{{Ref RFC|9110|rsection=15.4}}
;{{anchor|303}}[[HTTP 303|303 See Other]] (since HTTP/1.1)
: The response to the request can be found under another [[Uniform Resource Identifier|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.
;{{anchor|304}}304 Not Modified
: Indicates that the resource has not been modified since the version specified by the [[List of HTTP header fields#Request Headers|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.
;{{anchor|305}}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 [[Firefox|Mozilla Firefox]] and [[Internet Explorer]]) do not obey this status code.<ref>{{cite web |url=https://bugzilla.mozilla.org/show_bug.cgi?id=187996#c13 |title=Mozilla Bugzilla Bug 187996: Strange behavior on 305 redirect, comment 13 |date=March 3, 2003 |access-date=May 21, 2009 |archive-url=https://web.archive.org/web/20140421051946/https://bugzilla.mozilla.org/show_bug.cgi?id=187996#c13 |archive-date=April 21, 2014 |url-status=dead}}</ref>
;{{anchor|306}}306 Switch Proxy
: No longer used. Originally meant "Subsequent requests should use the specified proxy."
;{{anchor|307}}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.
;{{anchor|308}}308 Permanent Redirect
: This and all future requests should be directed to the given [[Uniform resource identifier|URI]]. 308 parallels the behavior of 301, but {{em|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 ==
[[File:Wikimedia error 404.png|alt=A The Wikimedia 404 message|thumb|404 error on Wikimedia]]
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 {{em|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 [[HTTP#Request methods|request method]]. User agents {{em|should}} display any included entity to the user.

;{{anchor|400}}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).
;{{anchor|401}}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 "unauthenticated", the user does not have valid authentication credentials for the target resource.
;{{anchor|402}}[[HTTP 402|402 Payment Required]]
: Reserved for future use. The original intention was that this code might be used as part of some form of [[digital cash]] or [[micropayment]] scheme, as proposed, for example, by [[GNU Taler]],<ref>{{Cite web|url=https://docs.taler.net/merchant/frontend/php/html/tutorial.html#Headers-for-HTTP-402|title=The GNU Taler tutorial for PHP Web shop developers 0.4.0|website=docs.taler.net|access-date=2017-10-29|archive-url=https://web.archive.org/web/20171108142249/https://docs.taler.net/merchant/frontend/php/html/tutorial.html#Headers-for-HTTP-402|archive-date=November 8, 2017|url-status=dead}}</ref> but that has not yet happened, and this code is not widely used. [[Google Developers]] API uses this status if a particular developer has exceeded the daily limit on requests.<ref>{{cite web |url=https://developers.google.com/doubleclick-search/v2/standard-error-responses#PAYMENT_REQUIRED |title=Google API Standard Error Responses |year=2016 |access-date=June 21, 2017 |archive-url=https://web.archive.org/web/20170525005121/https://developers.google.com/doubleclick-search/v2/standard-error-responses#PAYMENT_REQUIRED |archive-date=May 25, 2017 |url-status=dead}}</ref> [[Sipgate]] uses this code if an account does not have sufficient funds to start a call.<ref>{{cite web|url=https://api.sipgate.com/v2/doc/#/sessions/newCall|title=Sipgate API Documentation|access-date=July 10, 2018|archive-url=https://web.archive.org/web/20180710163601/https://api.sipgate.com/v2/doc#/sessions/newCall|archive-date=July 10, 2018|url-status=live}}</ref> [[Shopify]] uses this code when the store has not paid their fees and is temporarily disabled.<ref>{{cite web|url=https://help.shopify.com/en/api/getting-started/response-status-codes|title=Shopify Documentation|access-date=July 25, 2018|archive-url=https://web.archive.org/web/20180725122914/https://help.shopify.com/en/api/getting-started/response-status-codes|archive-date=July 25, 2018|url-status=live}}</ref> [[Stripe (company)|Stripe]] uses this code for failed payments where parameters were correct, for example blocked fraudulent payments.<ref>{{cite web |title=Stripe API Reference – Errors |url=https://stripe.com/docs/api/errors |website=stripe.com |access-date=28 October 2019 |ref=errors-402-RequestFailed}}</ref>
;{{anchor|403}}[[HTTP 403|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.
;{{anchor|404}}[[HTTP 404|404 Not Found]]
: The requested resource could not be found but may be available in the future. Subsequent requests by the client are permissible.
;{{anchor|405}}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 (HTTP)|POST]], or a PUT request on a read-only resource.
;{{anchor|406}}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]].
;{{anchor|407}}407 Proxy Authentication Required
:The client must first authenticate itself with the [[Proxy server|proxy]].
;{{anchor|408}}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."
;{{anchor|409}}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<ref>{{cite web |title=409 Conflict |url=https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/409 |website=MDN Web Docs |access-date=11 June 2025 |date=13 March 2025}}</ref>
;{{anchor|410}}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.
;{{anchor|411}}411 Length Required
: The request did not specify the length of its content, which is required by the requested resource.
;{{anchor|412}}412 Precondition Failed
: The server does not meet one of the preconditions that the requester put on the request header fields.
;{{anchor|413}}413 Payload Too Large
: The request is larger than the server is willing or able to process. Previously called "Request Entity Too Large".{{Ref RFC|2616|rsection=10.4.14}}
;{{anchor|414}}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.{{Ref RFC|2616|rsection=10.4.15}}
;{{anchor|415}}415 Unsupported Media Type
: The request entity has a [[Internet media type|media type]] which the server or resource does not support. For example, the client uploads an image as [[Scalable Vector Graphics|image/svg+xml]], but the server requires that images use a different format.
;{{anchor|416}}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.{{Ref RFC|2616|rsection=10.4.17}}
;{{anchor|417}}417 Expectation Failed
: The server cannot meet the requirements of the Expect request-header field.<ref>{{cite web |last1=TheDeadLike |title=HTTP/1.1 Status Codes 400 and 417, cannot choose which |url=http://serverfault.com/questions/433470/http-1-1-status-codes-400-and-417-cannot-choose-which |url-status=live |archive-url=https://web.archive.org/web/20151010125107/http://serverfault.com/questions/433470/http-1-1-status-codes-400-and-417-cannot-choose-which |archive-date=October 10, 2015 |access-date=16 October 2015 |website=serverFault}}</ref>
<!-- The following code is under discussion on the talk page. Please discuss there before removing this entry. -->
;{{anchor|418}}[[Hyper Text Coffee Pot Control Protocol|418 I'm a teapot]] (RFC 2324, RFC 7168)
:This code was defined in 1998 as one of the traditional [[Internet Engineering Task Force|IETF]] [[April Fools' Day RFC|April Fools' jokes]], in RFC 2324, ''[[Hyper Text Coffee Pot Control Protocol]]'', and is not expected to be implemented by actual HTTP servers. The RFC specifies this code should be returned by teapots requested to brew coffee.{{Ref RFC|2324|quote=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.}} This HTTP status is used as an [[Easter egg (media)|Easter egg]] in some websites, such as [[Google Search|Google.com's]] "I'm a teapot" easter egg.<ref>[https://www.google.com/teapot I'm a teapot]</ref><ref>{{cite news |url=http://searchengineland.com/new-google-easter-egg-seo-geeks-server-status-418-im-teapot-201739 |author=Barry Schwartz |date=26 August 2014 |title=New Google Easter Egg For SEO Geeks: Server Status 418, I'm A Teapot |work=Search Engine Land |access-date=November 4, 2015 |archive-url=https://web.archive.org/web/20151115041951/http://searchengineland.com/new-google-easter-egg-seo-geeks-server-status-418-im-teapot-201739 |archive-date=November 15, 2015 |url-status=dead}}</ref><ref>{{Cite web |url=https://www.google.com/teapot |title=Google's Teapot |access-date=October 23, 2017}}{{cbignore}}</ref> Sometimes, this status code is also used as a response to a blocked request, instead of the more appropriate 403 Forbidden.<ref>{{cite web|url=https://help.dreamhost.com/hc/en-us/articles/215947927-Enable-extra-web-security-on-a-website|title=Enable extra web security on a website|access-date=2022-12-18|website=[[DreamHost]]|language=en}}</ref><ref>{{Cite web|url=https://www.pcmag.com/news/i-went-to-a-russian-website-and-all-i-got-was-this-lousy-teapot|title=I Went to a Russian Website and All I Got Was This Lousy Teapot|access-date=2022-12-18|website=[[PCMag]]|language=en}}</ref>
;{{anchor|421}}421 Misdirected Request
: The request was directed at a server that is not able to produce a response (for example because of connection reuse).
;{{anchor|422}}422 Unprocessable Content
: The request was well-formed (i.e., syntactically correct) but could not be processed.{{Ref RFC|9110|rsection=15.5.21}}
;{{anchor|423}}423 Locked (WebDAV; RFC 4918)
: The resource that is being accessed is locked.{{Ref RFC|4918}}
;{{anchor|424}}424 Failed Dependency (WebDAV; RFC 4918)
: The request failed because it depended on another request and that request failed (e.g., a PROPPATCH).{{Ref RFC|4918}}
;{{anchor|425}}425 Too Early (RFC 8470)
:Indicates that the server is unwilling to risk processing a request that might be replayed.
;{{anchor|426}}426 Upgrade Required
: The client should switch to a different protocol such as [[Transport Layer Security|TLS/1.3]], given in the [[Upgrade header]] field.
;{{anchor|428}}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.{{Ref RFC|6585}}
;{{anchor|429}}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|rate-limiting]] schemes.<ref name="rfc6585" />
;{{anchor|431}}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.<ref name="rfc6585" />
;{{anchor|451}}[[HTTP 451|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.<ref>{{cite web|title=An HTTP Status Code to Report Legal Obstacles|url=https://tools.ietf.org/html/rfc7725|date=February 2016|last=Bray|first=T.|access-date=7 March 2015|website=ietf.org|archive-url=https://web.archive.org/web/20160304040017/http://tools.ietf.org/html/rfc7725|archive-date=March 4, 2016|url-status=live}}</ref> The code 451 was chosen as a reference to the novel ''[[Fahrenheit 451]]'' (see the Acknowledgements in the RFC).

== {{anchor|server errors}}5xx server errors ==
The [[server (computing)|server]] failed to fulfill 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 {{em|should}} include an entity containing an explanation of the error situation, and indicate whether it is a temporary or permanent condition. Likewise, user agents {{em|should}} display any included entity to the user. These response codes are applicable to any [[HTTP#Request methods|request method]].

;{{anchor|500|Internal Server Error}}500 Internal Server Error
: A generic error message, given when an unexpected condition was encountered and no more specific message is suitable.
;{{anchor|501|Not Implemented}}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).
;{{anchor|502|Bad Gateway}}[[HTTP 502|502 Bad Gateway]]
: The server was acting as a [[gateway (telecommunications)|gateway]] or proxy and received an invalid response from the upstream server.
;{{anchor|503|Service Unavailable}}503 Service Unavailable
: The server cannot handle the request (because it is overloaded or down for maintenance). Generally, this is a temporary state.<ref>{{cite web|last1=alex|title=What is the correct HTTP status code to send when a site is down for maintenance?|url=https://stackoverflow.com/questions/2786595/what-is-the-correct-http-status-code-to-send-when-a-site-is-down-for-maintenance|website=Stack Overflow|access-date=16 October 2015|archive-url=https://web.archive.org/web/20161011013125/https://stackoverflow.com/questions/2786595/what-is-the-correct-http-status-code-to-send-when-a-site-is-down-for-maintenance|archive-date=October 11, 2016|url-status=live}}</ref>
;{{anchor|504|Gateway Timeout}}504 Gateway Timeout
: The server was acting as a gateway or proxy and did not receive a timely response from the upstream server.
;{{anchor|505|HTTP Version Not Supported}}505 HTTP Version Not Supported
: The server does not support the HTTP version used in the request.
;{{anchor|506|Variant Also Negotiates|RFC 2295|2295}}506 Variant Also Negotiates (RFC 2295)
: Transparent [[content negotiation]] for the request results in a [[circular reference]].{{Ref RFC|2295}}
;{{anchor|507|Insufficient Storage|RFC 4918|4918}}507 Insufficient Storage (WebDAV; RFC 4918)
: The server is unable to store the representation needed to complete the request.{{Ref RFC|4918}}
;{{anchor|508|Loop Detected|RFC 5842|5842}}508 Loop Detected (WebDAV; RFC 5842)
: The server detected an infinite loop while processing the request (sent instead of [[#208|208 Already Reported]]).
;{{anchor|510|Not Extended|RFC 2774|2774}}510 Not Extended (RFC 2774)
: Further extensions to the request are required for the server to fulfil it.{{Ref RFC|2774}}
;{{anchor|511|Network Authentication Required|RFC 6585|6585}}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., "[[captive portal]]s" used to require agreement to Terms of Service before granting full Internet access via a [[Hotspot (Wi-Fi)|Wi-Fi hotspot]]).<ref name="rfc6585" />
:{{Anchor|unofficial}}

== Unofficial codes ==
The following codes are not specified by any standard.
; {{anchor|218}} 218 This is fine ([[Apache HTTP Server]])
: Used by Apache servers. A catch-all error condition allowing the passage of message bodies through the server when the <code>ProxyErrorOverride</code> setting is enabled. It is displayed in this situation instead of a 4xx or 5xx error message.<ref>{{cite web|title=218 This is fine – HTTP status code explained|url=https://http.dev/218|website=HTTP.dev|access-date=25 July 2023}}</ref>
; {{anchor|419}} 419 Page Expired ([[Laravel]] Framework)
:Used by the Laravel Framework when a CSRF Token is missing or expired.<ref>{{cite web|title=framework/src/Illuminate/Foundation/Exceptions/Handler.php|website=[[GitHub]] |url=https://github.com/laravel/framework/blob/57ae89a8acbc316153315272a4af2e68370f5e36/src/Illuminate/Foundation/Exceptions/Handler.php#L492|access-date=December 12, 2023}}</ref>
; {{anchor|420}} 420 Method Failure ([[Spring Framework]])
: A deprecated response status proposed during the development of [[WebDAV]]<ref>{{cite web|title=draft-ietf-webdav-protocol-05: Extensions for Distributed Authoring on the World Wide Web -- WEBDAV|url=https://datatracker.ietf.org/doc/html/draft-ietf-webdav-protocol-05#section-10.5}}</ref> used by the Spring Framework when a method has failed.<ref>{{cite web|title=Enum HttpStatus|url=https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/http/HttpStatus.html|website=Spring Framework|publisher=org.springframework.http|access-date=16 October 2015|archive-url=https://web.archive.org/web/20151025102238/http://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/http/HttpStatus.html|archive-date=October 25, 2015|url-status=live}}</ref>
; 420 Enhance Your Calm ([[Twitter]])
: Returned by version 1 of the Twitter Search and Trends API when the client is being rate limited; versions 1.1 and later use the [[#429|429 Too Many Requests]] response code instead.<ref>{{cite web|url=https://developer.twitter.com/en/docs/basics/response-codes|title=Twitter Error Codes & Responses|year=2014|publisher=[[Twitter]]|access-date=January 20, 2014|archive-url=https://web.archive.org/web/20170927155109/https://developer.twitter.com/en/docs/basics/response-codes|archive-date=September 27, 2017|url-status=dead}}</ref> The phrase "Enhance your calm" comes from the [[1993 movie]] ''[[Demolition Man (film)|Demolition Man]]'', and its association with this number is likely a [[420 (cannabis culture)|reference to cannabis]].{{Citation needed|date=August 2020}}
; 430 Request Header Fields Too Large ([[Shopify]])
: A deprecated response used by [[Shopify]], instead of the [[#429|429 Too Many Requests]] response code, when too many URLs are requested within a certain time frame.<ref>{{Cite web|url=https://www.contentkingapp.com/academy/http-status-codes/|title=HTTP Status Codes and SEO: what you need to know|website=ContentKing|language=en|access-date=2019-08-09}}</ref>
; 430 Shopify Security Rejection ([[Shopify]])
: Used by Shopify to signal that the request was deemed malicious.<ref name="shopify-api">{{Cite web|url=https://shopify.dev/docs/api/usage/response-codes|title=Shopify API response status and error codes|language=en|access-date=December 12, 2023}}</ref>
; {{anchor|450}} 450 Blocked by Windows Parental Controls (Microsoft)
: The Microsoft extension code indicated when Windows Parental Controls are turned on and are blocking access to the requested webpage.<ref>{{cite web|url=https://public.bn1.livefilestore.com/y1pJXeg_sNOONKwMraE-xmZFWAfZF6COAKnyfgc-2ykUof743pV4XuRqm14pj-b_yK8Km4sfSR6mU5OhLrupZ8dFg|title=Screenshot of error page|format=bmp|access-date=October 11, 2009|archive-url=https://web.archive.org/web/20130511045107/https://public.bn1.livefilestore.com/y1pJXeg_sNOONKwMraE-xmZFWAfZF6COAKnyfgc-2ykUof743pV4XuRqm14pj-b_yK8Km4sfSR6mU5OhLrupZ8dFg|archive-date=May 11, 2013|url-status=dead}}</ref>
; {{anchor|498}} 498 Invalid Token (Esri)
: Returned by [[ArcGIS Server|ArcGIS for Server]]. Code 498 indicates an expired or otherwise invalid token.<ref name="arcgis">{{cite web|url=http://help.arcgis.com/en/arcgisserver/10.0/apis/soap/index.htm#Using_token_authentication.htm|title=Using token-based authentication|website=ArcGIS Server SOAP SDK|access-date=September 8, 2014|archive-url=https://web.archive.org/web/20140926033953/http://help.arcgis.com/en/arcgisserver/10.0/apis/soap/index.htm#Using_token_authentication.htm|archive-date=September 26, 2014|url-status=dead}}</ref>
; {{anchor|499}} 499 Token Required (Esri)
: Returned by [[ArcGIS Server|ArcGIS for Server]]. Code 499 indicates that a token is required but was not submitted.<ref name="arcgis" />
; {{anchor|509}} 509 Bandwidth Limit Exceeded ([[Apache Web Server]]/[[cPanel]])
: The server has exceeded the bandwidth specified by the server administrator; this is often used by shared hosting providers to limit the bandwidth of customers.<ref>{{cite web|url=https://documentation.cpanel.net/display/CKB/HTTP+Error+Codes+and+Quick+Fixes#HTTPErrorCodesandQuickFixes-509BandwidthLimitExceeded|title=HTTP Error Codes and Quick Fixes|publisher=Docs.cpanel.net|access-date=October 15, 2015|archive-url=https://web.archive.org/web/20151123100640/https://documentation.cpanel.net/display/CKB/HTTP+Error+Codes+and+Quick+Fixes#HTTPErrorCodesandQuickFixes-509BandwidthLimitExceeded|archive-date=November 23, 2015|url-status=dead}}</ref>
; {{anchor|529}} 529 Site is overloaded
: Used by [[Qualys]] in the SSLLabs server testing API to signal that the site can not process the request.<ref>{{cite web |url=https://github.com/ssllabs/ssllabs-scan/blob/master/ssllabs-api-docs-v3.md#error-response-status-codes |title=SSL Labs API v3 Documentation |website=github.com}}</ref>
; {{anchor|530}} 530 Site is frozen
: Used by the [[Pantheon Systems]] web platform to indicate a site that has been frozen due to inactivity.<ref>{{cite web |url=https://pantheon.io/docs/platform-considerations/ |title=Platform Considerations {{!}} Pantheon Docs |website=pantheon.io |access-date=January 5, 2017 |archive-url=https://web.archive.org/web/20170106011710/https://pantheon.io/docs/platform-considerations/ |archive-date=January 6, 2017 |url-status=dead}}</ref>
; 530 Origin DNS Error ([[Shopify]])
: Used by Shopify to indicate that Cloudflare can't resolve the requested DNS record.<ref name="shopify-api" />
; {{anchor|540}} 540 Temporarily Disabled ([[Shopify]])
: Used by Shopify to indicate that the requested endpoint has been temporarily disabled.<ref name="shopify-api" />
; {{anchor|598}} 598 (Informal convention) Network read timeout error
: Used by some HTTP proxies to signal a network read timeout behind the proxy to a client in front of the proxy.<ref>{{Cite web|url=http://www.ascii-code.com/http-status-codes.php|title=HTTP status codes – ascii-code.com|website=www.ascii-code.com|access-date=2016-12-23|archive-url=https://web.archive.org/web/20170107115008/http://www.ascii-code.com/http-status-codes.php|archive-date=January 7, 2017|url-status=dead}}</ref>
; {{Anchor|599}} 599 Network Connect Timeout Error
: An error used by some HTTP proxies to signal a network connect timeout behind the proxy to a client in front of the proxy.
; {{anchor|783}} 783 Unexpected Token ([[Shopify]])
: Used by Shopify to indicate that the request includes a JSON syntax error.<ref name="shopify-api" />
; {{anchor|999}} 999 Non-standard
: Error 999 is used by LinkedIn and is related to being blocked/walled or unable to access their webpages without first signing in.<ref>[https://learn.microsoft.com/en-us/archive/msdn-technet-forums/5a4f8eb5-bf1b-4776-b4bb-4baef621838f Seen in 2017] + [https://archive.today/20240907164007/https://ipfs.desmos.network/ipfs/QmeoH4jKZG4SS6nuviqZeuiDggisYGitucvk7GrP3wrRZT/archive.is/www.linkedin.com/in/gregorybarr 2024 example]</ref>

=== Internet Information Services ===
Microsoft's [[Internet Information Services]] (IIS) web server expands the 4xx error space to signal errors with the client's request.

; {{anchor|440}} 440 Login Time-out
: The client's session has expired and must log in again.<ref>{{cite web|url=https://support.microsoft.com/en-us/help/941201/|title=Error message when you try to log on to Exchange 2007 by using Outlook Web Access: "440 Login Time-out"|year=2010|publisher=[[Microsoft]]|access-date=November 13, 2013}}</ref>
; {{anchor|449}} 449 Retry With
: The server cannot honour the request because the user has not provided the required information.<ref>{{cite web |url=http://msdn.microsoft.com/en-us/library/dd891478(PROT.10).aspx |title=2.2.6 449 Retry With Status Code |year=2009 |publisher=[[Microsoft]] |access-date=October 26, 2009 |archive-url=https://web.archive.org/web/20091005090136/http://msdn.microsoft.com/en-us/library/dd891478(PROT.10).aspx |archive-date=October 5, 2009 |url-status=live}}</ref>
; {{anchor|451-MS}} 451 Redirect
: Used in [[Exchange ActiveSync]] when either a more efficient server is available or the server cannot access the users' mailbox.<ref>{{cite web |title=MS-ASCMD, Section 3.1.5.2.2 |url=http://msdn.microsoft.com/en-us/library/gg651019 |publisher=Msdn.microsoft.com |access-date=January 8, 2015 |archive-url=https://web.archive.org/web/20150326120838/https://msdn.microsoft.com/en-us/library/gg651019 |archive-date=March 26, 2015 |url-status=live}}</ref> The client is expected to re-run the HTTP AutoDiscover operation to find a more appropriate server.<ref>{{cite web|title=Ms-oxdisco|url=http://msdn.microsoft.com/en-us/library/cc433481|publisher=Msdn.microsoft.com|access-date=January 8, 2015|archive-url=https://web.archive.org/web/20140731074358/http://msdn.microsoft.com/en-us/library/cc433481|archive-date=July 31, 2014|url-status=live}}</ref>

IIS sometimes uses additional decimal sub-codes for more specific information,<ref>{{cite web|url=http://support.microsoft.com/kb/943891/|title=The HTTP status codes in IIS 7.0|date=July 14, 2009|publisher=[[Microsoft]]|url-status=live|archive-url=https://web.archive.org/web/20090409091609/http://support.microsoft.com/kb/943891|archive-date=April 9, 2009|access-date=April 1, 2009}}</ref> however these sub-codes only appear in the response payload and in documentation, not in the place of an actual HTTP status code.

=== nginx ===
The [[nginx]] web server software expands the 4xx error space to signal issues with the client's request.<ref>{{cite web|url=http://lxr.nginx.org/source/src/http/ngx_http_request.h|title=ngx_http_request.h|work=nginx 1.9.5 source code|publisher=nginx inc.|access-date=2016-01-09|archive-url=https://web.archive.org/web/20170919111558/http://lxr.nginx.org/source/src/http/ngx_http_request.h|archive-date=September 19, 2017|url-status=dead}}</ref><ref>{{cite web|url=http://lxr.nginx.org/source/src/http/ngx_http_special_response.c|title=ngx_http_special_response.c|work=nginx 1.9.5 source code|publisher=nginx inc.|access-date=2016-01-09|archive-url=https://web.archive.org/web/20180508052017/http://lxr.nginx.org/source/src/http/ngx_http_special_response.c|archive-date=May 8, 2018|url-status=dead}}</ref>

; {{anchor|444}} 444 No Response
: Used internally<ref>[http://nginx.org/en/docs/http/ngx_http_rewrite_module.html#return "return" directive] {{Webarchive|url=https://web.archive.org/web/20180301164309/http://nginx.org/en/docs/http/ngx_http_rewrite_module.html#return |date=March 1, 2018}}  (http_rewrite module) documentation.</ref> to instruct the server to return no information to the client and close the connection immediately.
; {{anchor|494}} 494 Request header too large
: Client sent too large request or too long header line.
; {{anchor|495}} 495 SSL Certificate Error
:An expansion of the [[#400|400 Bad Request]] response code, used when the client has provided an invalid [[client certificate]].
; {{anchor|496}} 496 SSL Certificate Required
: An expansion of the [[#400|400 Bad Request]] response code, used when a client certificate is required but not provided.
; {{anchor|497}} 497 HTTP Request Sent to HTTPS Port
: An expansion of the [[#400|400 Bad Request]] response code, used when the client has made a HTTP request to a port listening for HTTPS requests.
; {{anchor|499}} 499 Client Closed Request
: Used when the client has closed the request before the server could send a response.

=== Cloudflare ===
[[Cloudflare]]'s reverse proxy service expands the 5xx series of errors space to signal issues with the origin server.<ref>{{cite web|url=https://support.cloudflare.com/hc/en-us/articles/115003014432-HTTP-Status-Codes|title=Troubleshooting: Error Pages|publisher=[[Cloudflare]]|access-date=2016-01-09|archive-url=https://web.archive.org/web/20160304035212/https://support.cloudflare.com/hc/en-us/sections/200820298-Error-Pages|archive-date=March 4, 2016|url-status=dead}}</ref>

; {{anchor|520}} 520 Web Server Returned an Unknown Error
: The origin server returned an empty, unknown, or unexpected response to Cloudflare.<ref>{{cite web|url=https://developers.cloudflare.com/support/troubleshooting/cloudflare-errors/troubleshooting-cloudflare-5xx-errors/#error-520-web-server-returns-an-unknown-error|title=Error 520: web server returns an unknown error|publisher=[[Cloudflare]]}}</ref>
; {{anchor|521}} 521 Web Server Is Down
: The origin server refused connections from Cloudflare. Security solutions at the origin may be blocking legitimate connections from certain Cloudflare IP addresses.
; {{anchor|522}} 522 Connection Timed Out
: Cloudflare timed out contacting the origin server.
; {{anchor|523}} 523 Origin Is Unreachable
: Cloudflare could not reach the origin server; for example, if the [[DNS record]]s for the origin server are incorrect or missing.
; {{anchor|524}} 524 A Timeout Occurred
: Cloudflare was able to complete a TCP connection to the origin server, but did not receive a timely HTTP response.
; {{anchor|525}} 525 SSL Handshake Failed
: Cloudflare could not negotiate a [[Transport Layer Security#TLS handshake|SSL/TLS handshake]] with the origin server.
; {{anchor|526}} 526 Invalid SSL Certificate
: Cloudflare could not validate the SSL certificate on the origin web server. Also used by [[Cloud Foundry]]'s gorouter.
; {{anchor|527}} 527 Railgun Error (obsolete)
: Error 527 indicated an interrupted connection between Cloudflare and the origin server's Railgun server.<ref>{{cite web|url=https://developers.cloudflare.com/support/troubleshooting/cloudflare-errors/troubleshooting-cloudflare-5xx-errors/#527-error-railgun-listener-to-origin-error|title=527 Error: Railgun Listener to origin error|publisher=[[Cloudflare]]|access-date=2016-10-12|archive-url=https://web.archive.org/web/20161013152120/https://support.cloudflare.com/hc/en-us/articles/217891268-527-Railgun-Listener-to-Origin-Error|archive-date=October 13, 2016|url-status=dead}}</ref> This error is obsolete as Cloudflare has deprecated Railgun.
; {{anchor|530}} 530
: Cloudflare was unable to resolve the origin hostname. The body of the response contains an 1xxx error.<ref>{{cite web|url=https://developers.cloudflare.com/support/troubleshooting/cloudflare-errors/troubleshooting-cloudflare-5xx-errors/#error-530|title=Error 530|publisher=[[Cloudflare]]|access-date=2019-11-01}}</ref>

=== AWS Elastic Load Balancing ===
[[Amazon Web Services]]' [[Elastic Load Balancing]] adds a few custom return codes to signal issues either with the client request or with the origin server.<ref name="aws.amazon.com">{{Cite web|url=https://docs.aws.amazon.com/elasticloadbalancing/latest/application/load-balancer-troubleshooting.html|title=Troubleshoot Your Application Load Balancers – Elastic Load Balancing|website=docs.aws.amazon.com|access-date=2023-05-17}}</ref>

; {{Anchor|000}} 000
: Returned with an HTTP/2 GOAWAY frame if the compressed length of any of the headers exceeds 8K bytes or if more than 10K requests are served through one connection.<ref name="aws.amazon.com" />
; {{Anchor|460}} 460
: Client closed the connection with the load balancer before the idle timeout period elapsed. Typically, when client timeout is sooner than the Elastic Load Balancer's timeout.<ref name="aws.amazon.com" />
; {{Anchor|463}} 463
: The load balancer received an X-Forwarded-For request header with more than 30 IP addresses.<ref name="aws.amazon.com" />
; {{Anchor|464}} 464
: Incompatible protocol versions between Client and Origin server.<ref name="aws.amazon.com" />
; {{Anchor|561}} 561 Unauthorized
: An error around authentication returned by a server registered with a load balancer. A listener rule is configured to authenticate users, but the identity provider (IdP) returned an error code when authenticating the user.<ref name="aws.amazon.com" />

== Caching warning codes (obsoleted) ==
The following [[Web cache|caching]] related warning codes were specified under {{IETF RFC|7234}}. Unlike the other status codes above, these were not sent as the response status in the HTTP protocol, but as part of the "Warning" HTTP header.{{Ref RFC|7234|section=5.5}}<ref>{{Cite web|title=Warning – HTTP {{!}} MDN|url=https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Warning|access-date=2021-08-15|website=developer.mozilla.org|language=en-US}}{{Creative Commons text attribution notice|cc=bysa2.5}}</ref>

Since this "Warning" header is often neither sent by servers nor acknowledged by clients, this header and its codes were obsoleted by the HTTP Working Group in 2022 with {{IETF RFC|9111}}.<ref>{{Cite IETF |date=June 2022 |rfc=9111 |title=HTTP Caching |section=5.5 |sectionname=Warning}}</ref>
; {{anchor|110}} 110 Response is Stale
: The response provided by a cache is stale (the content's age exceeds a maximum age set by a Cache-Control header or heuristically chosen lifetime).
; {{anchor|111}} 111 Revalidation Failed
: The cache was unable to validate the response, due to an inability to reach the origin server.
; {{anchor|112}} 112 Disconnected Operation
: The cache is intentionally disconnected from the rest of the network.
; {{anchor|113}} 113 Heuristic Expiration
: The cache heuristically chose a freshness lifetime greater than 24 hours and the response's age is greater than 24 hours.
; {{anchor|199}} 199 Miscellaneous Warning
: Arbitrary, non-specific warning. The warning text may be logged or presented to the user.
; {{anchor|214}} 214 Transformation Applied
: Added by a proxy if it applies any transformation to the representation, such as changing the content encoding, media type or the like.
; {{anchor|299}} 299 Miscellaneous Persistent Warning
: Same as 199, but indicating a persistent warning.

== See also ==
* [[HTTP 404#Custom error pages|Custom error pages]]
* [[List of FTP server return codes]]
* [[List of HTTP header fields]]
* [[List of SMTP server return codes]]
* [[Common Log Format]]

== Notes ==
{{Reflist|group=note}}

== References ==
{{Reflist}}

== External links ==
{{Commons category|HTTP status codes}}
* [https://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml Hypertext Transfer Protocol (HTTP) Status Code Registry] at the ''Internet Assigned Numbers Authority''
* [https://http-statuscode.com/en/home HTTP status codes] at ''http-statuscode.com''
* [https://developer.mozilla.org/en-US/docs/Web/HTTP/Status MDN status code reference] at ''mozilla.org''
{{Error messages}}

[[Category:Hypertext Transfer Protocol status codes| ]]
[[Category:Internet-related lists|HTTP status codes]]