I have been attempting to connect to URLs from python. I have tried: urllib2, urlib3, and requests. It is the same issue that i run up against in all cases. Once I get the answer I imagine all three of them would work fine.
The issue is connecting via proxy. I have entered our proxy information but am not getting any joy. I am getting 407 codes and error messages like: HTTP Error 407: Proxy Authentication Required ( Forefront TMG requires authorization to fulfill the request. Access to the Web Proxy filter is denied. )
However, I can connect using another of other applications that go through the proxy, git for example. When I run git config --get htpp.proxy it returns the same values and format that I am entering in Python namely
http://username:password@proxy:8080
An example of code in requests is
import requests
proxy = {"http": "http://username:password@proxy:8080"}
url = 'http://example.org'
r = requests.get(url, proxies=proxy)
print r.status_code
Thanks for your time
In the requests module, proxy authentication is performed as shown:
import requests
proxies = {'http':'http://x.x.x.x', 'https':'https://x.x.x.x'}
auth = requests.auth.HTTPProxyAuth('username', 'password')
r = requests.get('http://www.example.com', proxies = proxies, auth = auth)
print r.status_code, r.reason
I have solved my issue by installing CNTLM. Once this is setup and configured I set the HTTP_PROXY etc.
You can use the HTTP_PROXY in python in order to connect to your proxy server. You can find more detailed information on this link provided.
The above link is showed the example using urllib2. Actually I have used this some time back to connect to two servers simultaneously. Hope this will help you
来源：https://stackoverflow.com/questions/16703936/proxy-connection-with-python