Why am I getting this error? HTTP Error 407: Proxy Authentication Required
Question: I am using the following code found on post, [How to specify an authenticated
proxy for a python http
connection?](http://stackoverflow.com/questions/34079/how-to-specify-an-
authenticated-proxy-for-a-python-http-connection/3942980#3942980)

    
    
    import urllib2
    
    def get_proxy_opener(proxyurl, proxyuser, proxypass, proxyscheme="http"):
        password_mgr = urllib2.HTTPPasswordMgrWithDefaultRealm()
        password_mgr.add_password(None, proxyurl, proxyuser, proxypass)
    
        proxy_handler = urllib2.ProxyHandler({proxyscheme: proxyurl})
        proxy_auth_handler = urllib2.ProxyBasicAuthHandler(password_mgr)
    
        return urllib2.build_opener(proxy_handler, proxy_auth_handler)
    
    if __name__ == "__main__":
        import sys
        if len(sys.argv) > 4:
            url_opener = get_proxy_opener(*sys.argv[1:4])
            for url in sys.argv[4:]:
                print url_opener.open(url).headers
        else:
            print "Usage:", sys.argv[0], "proxy user pass fetchurls..."
    

I am using the proxy ip as specified in my wpad.dat file for argv[1]. (# for
confidentiality)

    
    
    return "PROXY 138.84.###.###:####";
    

I am using my username and password for argval[2] and [3]. When I use
<http://google.com> it spits out the appropriate header information. When I
use <http://shipcsx.com/pub_sx_mainpagepublic_jct/sx.shipcsxpublic/Main> it
shows: HTTP Error 407: Proxy Authentication Required.


Answer: This may not be a question for StackExchange. You may need some visibility
into your proxy server to troubleshoot properly. With no other information,
I'll take an offhand guess that the Google domain (or part of it) is
configured as a trusted site at the proxy. This allows a request to bypass
proxy authentication entirely.

