HTTP Status Code Reference

The server cannot process the request due to a client error (malformed syntax, invalid parameters).

The request requires user authentication. The client must provide valid credentials.

Reserved for future use. Originally intended for digital payment systems.

The server understood the request but refuses to authorize it.

The server cannot find the requested resource. The URL is not recognized.

The HTTP method is not supported for the requested resource.

The server cannot produce a response matching the Accept headers sent by the client.

The client must first authenticate itself with the proxy.

The server timed out waiting for the client to send the request.

The request conflicts with the current state of the server.

The resource is no longer available and will not be available again.

The server requires a Content-Length header in the request.

One or more conditions in the request header fields evaluated to false.

The request body is larger than the server is willing to process.

The URI provided was too long for the server to process.

The server does not support the media type of the request body.

The range specified in the Range header cannot be fulfilled.

The server cannot meet the requirements of the Expect request header.

The server refuses to brew coffee because it is, permanently, a teapot.

The request was directed at a server that is not able to produce a response.

The server understands the content type and syntax but cannot process the contained instructions.

The resource is currently locked and cannot be modified.

The request failed because it depended on another request that failed.

The server is unwilling to risk processing a request that might be replayed.

The server refuses to perform the request using the current protocol.

The origin server requires the request to be conditional.

The user has sent too many requests in a given amount of time (rate limiting).

The server refuses to process the request because the headers are too large.

The server is denying access to the resource as a consequence of a legal demand.