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List of all HTTP Server/Client Status Codes and meanings AppNee
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In practice, we often encounter some HTTP protocol status codes include 200, 301, 302, 403, 404, 500, 503 and so on, understanding the significance of these codes, and what server or client problems the codes mean, as well as the solutions to these common questions, that will make our work efficiency improved a lot, especially for webmasters.

// Codes Classification //

Since given the right and wrong status codes, then whether the HTTP status codes can be defined as two main categories or not? I will tell you that anybody who has made this protocol must be expert (not like me, pretending to be), so they must make sure everything to be considered in the long term.

At HTTP 1.1, it defines five types of status codes, respectively is:




Informational Successful Redirection Client Error Server Error

// List of Status Codes //

A brief overview of HTTP status codes is given below:




100 Continue Confirms the client about the arrival of the first part of the request and informs to continue with the rest of the request or ignore if the request has been fulfilled
101 Switching Protocols Informs the client about the server switching the protocols to that specified in the Upgrade message header field during the current connection.
200 OK Standard response for successful requests
201 Created Request fulfilled and new resource created
202 Accepted Request accepted, but not yet processed
203 Non-Authoritative Information Returned meta information was not the definitive set from the origin server.
204 No Content Request succeeded without requiring the return of an entity-body
205 Reset Content Request succeeded but require resetting of the document view that caused the request
206 Partial Content Partial GET request was successful
300 Multiple Choices Requested resource has multiple choices at different locations.
301 Moved Permanently Resource permanently moved to a different URL.
302 Found Requested resource was found under a different URL but the client should continue to use the original URL.
303 See Other Requested response is at a different URL and can be accessed only through a GET command.
304 Not Modified Resource not modified since the last request.
305 Use Proxy Requested resource should be accessed through the proxy specified in the location field.
306 No Longer Used Reserved for future use
307 Temporary Redirect Resource has been moved temporarily to a different URL.
400 Bad Request Syntax of the request not understood by the server.
401 Not Authorized Request requires user authentication
402 Payment Required Reserved for future use.
403 Forbidden Server refuses to fulfill the request.
404 Not Found Document or file requested by the client was not found.
405 Method Not Allowed Method specified in the Request-Line was not allowed for the specified resource.
406 Not Acceptable Resource requested generates response entities that has content characteristics not specified in the accept headers.
407 Proxy Authentication Required Request requires the authentication with the proxy.
408 Request Timeout Client fails to send a request in the time allowed by the server.
409 Conflict Request was unsuccessful due to a conflict in the state of the resource.
410 Gone Resource requested is no longer available with no forwarding address
411 Length Required Server doesn’t accept the request without a valid Content-Length header field.
412 Precondition Failed Precondition specified in the Request-Header field returns false.
413 Request Entity Too Large Request unsuccessful as the request entity is larger than that allowed by the server
414 Request URL Too Long Request unsuccessful as the URL specified is longer than the one, the server is willing to process.
415 Unsupported Media Type Request unsuccessful as the entity of the request is in a format not supported by the requested resource
416 Requested Range Not Satisfiable Request included a Range request-header field without any range-specifier value
417 Expectation Failed Expectation given in the Expect request-header was not fulfilled by the server.
422 Unprocessable Entity Request well-formed but unable to process because of semantic errors
423 Locked Resource accessed was locked
424 Failed Dependency Request failed because of the failure of a previous request
426 Upgrade Required Client should switch to Transport Layer Security
500 Internal Server Error Request unsuccessful because of an unexpected condition encountered by the server.
501 Not Implemented Request unsuccessful as the server could not support the functionality needed to fulfill the request.
502 Bad Gateway Server received an invalid response from the upstream server while trying to fulfill the request.
503 Service Unavailable Request unsuccessful to the server being down or overloaded.
504 Gateway Timeout Upstream server failed to send a request in the time allowed by the server.
505 HTTP Version Not Supported Server does not support the HTTP version specified in the request.

// Related Links //

  • HTTP status codes from Google Webmaster Tools
  • HTTP status codes from Wikipedia
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