Respect 'no_proxy' environment variable
In a proxy environment, the 'no_proxy' env variable defines exceptions. Disrespecting these might break wget2 usage (also in the test suite).
Example:
http_proxy='http://192.168.1.2:1234/'
http_proxy='http://192.168.1.2:1235/'
no_proxy='localhost,127.0.0.0/8'