100
Continue
Server received headers; client should continue request.
101
Switching Protocols
Server is switching protocols per client request.
200
OK
Standard success response.
201
Created
Request succeeded and a resource was created.
202
Accepted
Request accepted but not yet processed.
204
No Content
Success with no body.
206
Partial Content
Range request served.
301
Moved Permanently
Resource has moved to a new URL.
302
Found
Temporary redirect.
304
Not Modified
Cached version may be used.
307
Temporary Redirect
Method preserved temporary redirect.
308
Permanent Redirect
Method preserved permanent redirect.
400
Bad Request
Malformed request.
401
Unauthorized
Authentication required.
403
Forbidden
Authenticated but not allowed.
404
Not Found
Resource not found.
405
Method Not Allowed
HTTP method not supported.
409
Conflict
Request conflicts with current state.
410
Gone
Resource permanently removed.
413
Payload Too Large
Request body too large.
415
Unsupported Media Type
Body content type unsupported.
422
Unprocessable Entity
Semantic errors in payload.
429
Too Many Requests
Rate limited.
500
Internal Server Error
Generic server failure.
501
Not Implemented
Server does not support functionality.
502
Bad Gateway
Invalid response from upstream.
503
Service Unavailable
Server overloaded or down for maintenance.
504
Gateway Timeout
Upstream did not respond in time.