HTTP Status Codes

Internal Server Error — the server encountered an unexpected condition preventing request fulfillment

Bad Gateway — the server received an invalid response from an upstream server

Service Unavailable — the server is temporarily unable to handle requests due to overload

Gateway Timeout — the gateway did not receive an upstream response in time

Insufficient Storage — the server lacks space to complete the request

Not Implemented — the server does not support the HTTP method used in the request

Not Found — the server cannot find the requested resource at the given URL

Forbidden — the server understood the request but refuses to authorize it

Bad Request — the server cannot process the request because it is malformed

Unauthorized — valid authentication credentials are missing for the target resource

Method Not Allowed — the resource exists but does not accept this HTTP method

Request Timeout — the server did not receive a complete request in time

Gone — the requested resource was intentionally removed and is no longer available

Unprocessable Content — the server understood the request but cannot apply its instructions

Too Many Requests — the client exceeded the allowed request rate

Content Too Large — the request body is larger than the server allows

URI Too Long — the requested URL exceeds the server length limit

Unsupported Media Type — the server rejects the request payload format

Unavailable For Legal Reasons — the server legally cannot serve the resource

Conflict

Locked

Precondition Required — the origin server requires the request to be conditional

Request Header Fields Too Large — headers exceed the server buffer limit

Network Authentication Required — the client needs to authenticate to gain network access

Proxy Authentication Required — client must authenticate with a proxy before forwarding the request

Precondition Failed — one or more request header conditions evaluated to false on the server

Moved Permanently — the requested resource has been assigned a new permanent URL

Found — the resource temporarily resides under a different URL

Not Modified — the client cache copy remains valid and unchanged

Temporary Redirect — the resource temporarily resides at a different location

Permanent Redirect — the resource was permanently moved without method changes

I'm a teapot — the server refuses to brew coffee in a teapot

Payment Required

Not Acceptable — the server cannot produce a response matching the request headers

HTTP Version Not Supported

Upgrade Required — the server refuses to perform the request using the current protocol

Continue — the server has received the request headers and the client should proceed

Switching Protocols — the server is switching to the protocol requested by the client

Created — the request was successful and a new resource was created

Accepted — the request has been accepted for processing, but is not yet complete

No Content — the request was successful but there is no content to return

Partial Content — the server is delivering only part of the resource as requested

OK — the request succeeded and the server returned the expected response

Non-Authoritative Information — the response was modified by an intermediate proxy

Reset Content — the server asks the client to reset the document view

Multi-Status — the response contains status information for multiple resources

IM Used — the server fulfilled a delta-encoding request for the resource

Range Not Satisfiable — the server cannot fulfill the byte range specified in the request