What are the HTTP status code 4XX?

HTTP - 4XX status code

About

All status code that begins with the number 4 are error code.

Meaning that an error has occurred during the request and that the server may use any of this code to send feedback about bad request parameters for instance.

The specification calls this type of error error caused by the client and makes a distinction with the error of the server that is classified with a 5XX number.

List

Code Description
400 Bad Request
401 Unauthorized
402 Payment Required
403 Forbidden
404 Not Found
405 Method Not Allowed
406 Not Acceptable (send for instance when the requested media type cannot be send)
407 Proxy Authentication Required
408 Request Timeout
409 Conflict
410 Gone
411 Length Required
412 Precondition Failed
413 Request Entity Too Large
414 Request-URI Too Long
415 Unsupported Media Type
416 Requested Range Not Satisfiable
417 Expectation Failed
422 Unprocessable Entity (The client should not repeat this request without modification.)
444 A non-standard status code used to instruct nginx to close the connection without sending a response to the client, most commonly used to deny malicious or malformed requests. - This status code is not seen by the client, it only appears in nginx log files. (you may also send a 503 (Service Temporarily Unavailable))

Documentation / Reference




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