Error 501

Error 501: not implemented

Cloudflare Workers returns a 501 error when a request uses an HTTP method that is not supported by the Workers Runtime.

Common causes

• A client sent a request to a Workers script using a custom or non-standard HTTP method (methods outside of GET, POST, PUT, etc.).
• A typo in the HTTP method (for example, POT instead of POST).

Resolution

• Update the client to use a valid, standard HTTP request method ↗.