What causes an HTTP 501 error and how do I fix it? or Getting an HTTP 501 - Not Implemented error. An

Yo, http 501 errors are usually server-side. Like, the server’s literally saying "I don’t do that." Lol.

Quick thing to try: swap POST to GET and see if it works. If it does, then yeah, your server’s blocking POST.

If you’re using Nginx, check if you’ve got `allow_methods` set up right. Also, curl -v is your friend for debugging headers.