Status Codes

See for a full list, I'm just going to cover the odd cases that have bitten me in the past here:

(Moved Permanently) and (Found, or a temporary redirect) are supposed to leave the HTTP method unaltered (based on this ), but many HTTP clients (including curl) do not respect that for historical reasons and change the method to a GET, as a result of that it's recommended to use (Permanent Redirect) and (Temporary Redirect) if preserving the HTTP method is important.