That's a loong list! HTTP error codes and what they do and what they mean. You may not see all of them, but now you can imagine them all.

https://en.wikipedia.org/wiki/List_of_HTTP_status_codes

https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status

And all other random blog posts that helped me out here:

kinsta.com

Hostinger

Microsoft Community

Stack Overflow