Proxy username/password with Twisted

Question

I'm trying to use Twisted's ProxyAgent class to connect to a proxy server and make HTTP requests, however the server requires a username and password. Is it possible to specify these credentials to the server using ProxyAgent?

endpoint = TCP4ClientEndpoint(reactor, host, port)
agent = ProxyAgent(endpoint)

# Maybe need to pass auth credentials in the header here?
body = agent.request("GET", path)

Answer 1

Figured out the problem, the Proxy-Authorization field has to be set in the headers:

endpoint = TCP4ClientEndpoint(reactor, host, port)
agent = ProxyAgent(endpoint)

headers = {}
auth = base64.b64encode("%s:%s" % (username, password))
headers["Proxy-Authorization"] = ["Basic " + auth.strip()]

body = agent.request("GET", path, Headers(headers))