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