Error Status Messages http 400 series

The error messages in the 400 series are generally messages indicating, that there is a problem on the client or user side of the network.

So here is a compiled list of usual error messages that the end users encounter.

400 Bad Request: The request made by the user, could not be understood by the server due to the syntax being used wrongly.

401 Unauthorized Request: The request requires user authorization (which may include username, password etc) but the codes sent were invalid. This error is sent when either the username sent is not recognized or when the combination is incorrect.

402 Payment Required: This http status code is reserved for future use.

403 Forbidden: A very common error in which, The server understood the request, but refuses to act upon it.

404 Not Found: This is the most common and the most easily recognized error message. It states that the URI requested does not exist on the server. Usually happens when links are removed.

405 Method Not Allowed: The method specified is not allowed for the resource requested.

406 Not Acceptable: The resource identified by the request is only capable of generating response entities which have content characteristics not acceptable according to the accept headers sent in the request.

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