HTTP Status Codes

Bad Request

The server cannot process the request due to a client error.

Unauthorized

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

Payment Required

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

Forbidden

The server understood the request but refuses to authorize it.

Not Found

The server cannot find the requested resource.

Method Not Allowed

The HTTP method used is not supported for the requested resource.

Not Acceptable

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

Proxy Authentication Required

The client must authenticate with the proxy before the request can proceed.

Request Timeout

The server timed out waiting for the request from the client.

Conflict

The request conflicts with the current state of the server.

Gone

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

Length Required

The server requires the Content-Length header to be specified.

Precondition Failed

One or more conditions in the request headers evaluated to false.

Content Too Large

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

URI Too Long

The URI requested by the client is longer than the server is willing to interpret.

Unsupported Media Type

The media format of the request is not supported by the server.

Range Not Satisfiable

The range specified in the Range header cannot be fulfilled.

I'm a Teapot

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

Unprocessable Content

The request was well-formed but could not be processed due to semantic errors.

Too Early

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

Upgrade Required

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

Precondition Required

The server requires the request to be conditional.

Too Many Requests

The user has sent too many requests in a given amount of time.

Request Header Fields Too Large

The server refuses the request because the header fields are too large.

Unavailable For Legal Reasons

The resource is unavailable due to legal demands.