I created this patch to further the functionality of redirection using the "location" header in the HTTPRedirectHandler class under urllib/request.py

Currently, the method http_error_302, which will handle code 302 redirection will parse the location header and build a Request accordingly. I encountered a website that only returned "index.php" as the Location header. When http_error_302 called on urlparse, it returned the following tuple: ParseResult(scheme='', netloc='', path='index.php', params='', query='', fragment='')

Then, http_error_302 will check if the scheme is equal to either http, https, or ftp. This is the part I changed in the patch. If it does not pass, an exception is thrown.

Afterwards, http_error_302 builds the target url. As long as the url passes the scheme check, the program will succeed.