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HTTP status message

These errors are commonly referred to as HTML error messages. But these messages are also called HTTP status messages. In fact, the server always returns a message for every request. The most common message is 200 OK.

Here is a list of HTTP status messages that may be returned:

1xx: Information

Notify Describe
100 Continue The server has received the request header and the client will proceed to send the request body
101 Switching Protocols The requesting party requested the server to transfer the protocol
103 Early Hints Used with the Link header to allow the browser to start preloading the resource while the server is preparing a response

2xx: Success

Notify Describe
200 OK Request approved (this is the standard response for successful HTTP requests)
201 Created The request was made and a new resource was created
202 Accepted The request has been accepted for processing, but the processing is not complete yet
203 Non-Authoritative Information The request was processed successfully but is returning information possibly from another source
204 No Content The request was processed successfully but no content was returned
205 Reset Content The request was processed successfully, but did not return any content and requires the requesting party to reset the document view
206 Partial Content The server only distributes a portion of the resource by the scope header sent by the client

3xx: Redirects

Notify Describe
300 Multiple Choices A linked list. The user can select a link and go to that location. Up to 5 addresses
301 Moved Permanently The requested page has moved to a new URL
302 Found The requested page has temporarily moved to a new URL
303 See Other The requested page can be found under a different URL
304 Not Modified Indicates the requested page has not been modified since the last request
307 Temporary Redirect The requested page has temporarily moved to a new URL
308 Permanent Redirect The requested page has permanently moved to a new URL

4xx: Client error

Notify Describe
400 Bad Request The request could not be fulfilled due to incorrect syntax
401 Unauthorized The request is valid, but the server refuses to respond to it. Use when authentication is possible but fails or has not been specified
402 Payment Required Use for the future
403 Forbidden The request is valid, but the server refuses to respond to it
404 Not Found The requested page could not be found, but it may be available again in the future
405 Method Not Allowed The page was made using a request method that is not supported by the page
406 Not Acceptable The server can only generate a response that is not accepted by the client
407 Proxy Authentication Required The client must first authenticate itself using a proxy
408 Request Timeout The server has timed out waiting for the request
409 Conflict The request could not be completed due to a conflict in the request
410 Gone The requested page is no longer available
411 Length Required "Content-Length" is not defined. The server will not accept the request without it
412 Precondition Failed The precondition given in the request is evaluated as false by the server
413 Request Too Large The server won't accept the request because the request entity is too large
414 Request-URI Too Long The server won't accept the request because the URI is too long. Happens when you convert POST request to GET request with long query information
415 Unsupported Media Type The server will not accept the request, because the media type is not supported
416 Range Not Satisfiable The client requested part of the file, but the server could not provide that part
417 Expectation Failed The server could not respond to the requests of the Expect request-header . field

5xx: Server Error

Notify Describe
500 Internal Server Error Generic error message, given when no specific message matches
501 Not Implemented The server does not recognize the request method or is unable to make the request
502 Bad Gateway The server is acting as a gateway or proxy and received an invalid response from the upstream server
503 Service Unavailable Server is currently unavailable (overloaded or down)
504 Gateway Timeout The server is acting as a gateway or proxy and is not receiving 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
511 Network Authentication Required Client needs authentication to have network access
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