When gPodder runs in environment where HTTPS_PROXY is some HTTP proxy server, all downloads (from a HTTPS link) fail (the situation differs with different proxy servers; some respond with 400 Bad Request, and some misinterpret the request).

This may have something to do with the deprecated FancyURLopener, which directly sends b'GET https://host-of-url.com/path HTTP/1.1\r\n ...' to the HTTP proxy server instead of using the CONNECT method.