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Unless it was a HEAD request, the response SHOULD include an entity containing a list of resource characteristics and location(s) from which the user or user agent can choose the one most appropriate. The response MUST include the following header fields: - Either a Content-Range header field (section 14.16) indicating the range included with this response, or a multipart/byteranges Content-Type including Content-Range fields for each part. When interoperability with such clients is a concern, the 302 status code may be used instead, since most user agents react to a 302 response as described here for 303. 10.3.5 304 Not Modified If the client has performed a conditional GET request and access is allowed, but the document has not been modified, the server SHOULD respond with this status code. The user can select a link and go to that location.

In a GET request, the response will contain an entity corresponding to the requested resource. The new permanent URI SHOULD be given by the Location field in the response. IETF. The 410 response is primarily intended to assist the task of web maintenance by notifying the recipient that the resource is intentionally unavailable and that the server owners desire that remote links to that resource be removed.

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Depending upon the format and the capabilities of the user agent, selection of the most appropriate choice MAY be performed automatically. April 2015. These status codes are applicable to any request method. Retrieved 16 October 2015. ^ Berners-Lee, Tim; Fielding, Roy T.; Nielsen, Henrik Frystyk (May 1996).

This response code probably is most famous one due to its frequency to occur in web. 405 Method Not Allowed The request method is known by the server but has been disabled and cannot be used. Network Working Group. Wikipedia Many HTTP clients (such as Mozilla and Internet Explorer) do not correctly handle responses with this status code, primarily for security reasons. 306 (Unused) The 306 status code was used in a previous version of the specification, is no longer used, and the code is reserved. Http 422 There is no standardized way to choose one of the responses. 301 Moved Permanently This response code means that URI of requested resource has been changed.

The meaning of a success varies depending on the HTTP method: GET: The resource has been fetched and is transmitted in the message body. Http Status Codes Cheat Sheet 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 server refuses to accept the request without a defined Content- Length. It is telling to client that response has not been modified. GitHub.

RFC 1945. Http Code 302 on GitHub on GitHub Try it out Test http-error in your browser. a web browser or other HTTP client). Thank you,,for signing up!

Http Status Codes Cheat Sheet

If the server does not know, or has no facility to determine, whether or not the condition is permanent, the status code 404 (Not Found) SHOULD be used instead. go to this web-site Retrieved February 8, 2015. ^ "Google API Standard Error Responses". Http Error Wordpress If the 510 response contains information about extensions that were not present in the initial request then the client MAY repeat the request if it has reason to believe it can fulfill the extension policy by modifying the request according to the information provided in the 510 response. Http Response Example User agents SHOULD display any included entity to the user.

Unless the request method was HEAD, the entity of the response SHOULD contain a short hypertext note with a hyperlink to the new URI(s). Some servers may wish to simply refuse the connection. 10.5.5 504 Gateway Timeout The server, while acting as a gateway or proxy, did not receive a timely response from the upstream server specified by the URI (e.g. A 201 response MAY contain an ETag response header field indicating the current value of the entity tag for the requested variant just created, see section 14.19. 10.2.3 202 Accepted The request has been accepted for processing, but the processing has not been completed. Subclassing StandardHttpError If you wish to add your own functionality to StandardHttpError, subclass it: var HttpError = require("standard-http-error") function RemoteError(res) {  HttpError.call(this, res.statusCode, res.statusMessage)} RemoteError.prototype = Object.create(HttpError.prototype, {  constructor: {value: RemoteError, configurable: true, writeable: true}}) The StandardError.js library that StandardHttpError.js uses makes sure the name and stack properties of your new error class are set properly. Http Code 403

This code is only allowed in situations where it is expected that the user might be able to resolve the conflict and resubmit the request. Wikipedia The origin server requires the request to be conditional. If the 401 response contains the same challenge as the prior response, and the user agent has already attempted authentication at least once, then the user SHOULD be presented the entity that was given in the response, since that entity might include relevant diagnostic information. Wikipedia The client must first authenticate itself with the proxy. 408 Request Timeout The client did not produce a request within the time that the server was prepared to wait.

A code of 499 indicates that a token is required but was not submitted.[68] 499 Request has been forbidden by antivirus Produced by some programs such as Wget when a malicious site is intercepted.[citation needed] 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.[69] 530 Site is frozen Used by the Pantheon web platform to indicate a site that has been frozen due to inactivity. Http 502 Note: Note to implementors: some deployed proxies are known to return 400 or 500 when DNS lookups time out. 10.5.6 505 HTTP Version Not Supported The server does not support, or refuses to support, the HTTP protocol version that was used in the request message. File it.

with a HTML form).

Switching based on error codes switch (err.code) {  case HttpError.UNAUTHORIZED: return void res.redirect("/signin")  case HttpError.NOT_FOUND: return void res.render("404")  case 451: return void res.redirect("/legal")  default: return void res.render("500")} Using with Express StandardHttpError.js comes very handy when used with Connect/Express's error handling functionality: var HttpError = require("standard-http-error")var app = require("express")() app.get("/account", function(req, res, next) {  if (req.account == null) throw new HttpError(401)  if (req.account.budget == 0) throw new HttpError(402)  // ... }) app.use(function(err, req, res, next) {  if (!(err instanceof HttpError)) return void next(err)   res.statusCode = err.code  res.statusMessage = err.message  res.render("error", {title: err.message})}) Error Codes StandardHttpError.js comes with a list of status message constants that you can use for comparison and in switch statements. Wikipedia The client has asked for a portion of the file, but the server cannot supply that portion. The proxy MUST return a Proxy-Authenticate header field (section 14.33) containing a challenge applicable to the proxy for the requested resource. Http 404 This interim response is used to inform the client that the initial part of the request has been received and has not yet been rejected by the server.

The temporary URI SHOULD be given by the Location field in the response. Unexpected 1xx status responses MAY be ignored by a user agent. https://tools.ietf.org/html/rfc2774. A cache MUST NOT combine a 206 response with other previously cached content if the ETag or Last-Modified headers do not match exactly, see 13.5.4.

If the server has a preferred choice of representation, it SHOULD include the specific URI for that representation in the Location field; user agents MAY use the Location field value for automatic redirection. Unlike a 204 response, this response requires that the requester reset the document view.[13] 206 Partial Content (RFC 7233) The server is delivering only part of the resource (byte serving) due to a range header sent by the client. Tools.ietf.org. Using var HttpError = require("standard-http-error")throw new HttpError(404) Your error handler will then receive an instance of HttpError along with the following enumerable properties: Property Value name "HttpError" code 404 message "Not Found" As always for errors, the non-enumerable stack property is there as well.

Wikipedia The server either does not recognise the request method, or it lacks the ability to fulfill the request. 502 Bad Gateway The server, while acting as a gateway or proxy, received an invalid response from the upstream server it accessed in attempting to fulfill the request. TRACE: The message body contains the request message as received by the server 201 Created The request has succeeded and a new resource has been created as a result of it. Retrieved 16 October 2015. ^ a b c d e Dusseault, Lisa, ed. (June 2007). 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.

This means that the actual status code that is returned depends on how the server software handles a particular error--this guide should generally point you in the right direction Now that you have a high-level understanding of HTTP status codes, we will look at the commonly encountered errors. 400 Bad Request The 400 status code, or Bad Request error, means the HTTP request that was sent to the server has invalid syntax. Conflicts are most likely to occur in response to a PUT request. The client MAY repeat the request with a suitable Proxy-Authorization header field (section 14.34). RFC 2518.

List of HTTP status codes From Wikipedia, the free encyclopedia Jump to: navigation, search HTTP Persistence Compression HTTPS Request methods OPTIONS GET HEAD POST PUT DELETE TRACE CONNECT PATCH Header fields Cookie ETag Location HTTP referer DNT X-Forwarded-For Status codes 301 Moved Permanently 302 Found 303 See Other 403 Forbidden 404 Not Found 451 Unavailable For Legal Reasons v t e This is a list of Hypertext Transfer Protocol (HTTP) response status codes. If the client is sending data, a server implementation using TCP SHOULD be careful to ensure that the client acknowledges receipt of the packet(s) containing the response, before the server closes the input connection. See Basic access authentication and Digest access authentication. Wikipedia The server is unable to store the representation needed to complete the request. 508 Loop Detected (WebDAV) The 508 (Loop Detected) status code indicates that the server terminated an operation because it encountered an infinite loop while processing a request with "Depth: infinity".

Many HTTP clients (such as Mozilla[26] and Internet Explorer) do not correctly handle responses with this status code, primarily for security reasons.[27] 306 Switch Proxy No longer used. This has the same semantic than the 302 Found HTTP response code, with the exception that the user agent must not change the HTTP method used: if a POST was used in the first request, a POST must be used in the second request. 308 Permanent Redirect This means that the resource is now permanently located at another URI, specified by the Location: HTTP Response header. The entity format is specified by the media type given in the Content-Type header field. 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.

The user-agent may update its cached headers for this resource with the new ones. 205 Reset Content This response code is sent after accomplishing request to tell user agent reset document view which sent this request. 206 Partial Content This response code is used because of range header sent by the client to separate download into multiple streams.