How to get port number from an HTTP response, using Python?

Question

I am trying to simulate Network Address Translation for some test code. I am mapping virtual users to high port numbers, then, when I want to test a request from user 1, I send it from port 6000 (user 2, from 6001, etc).

However, I can't see the port number in the response.

        connection = httplib.HTTPConnection("the.company.lan", port=80, strict=False,   
                                          timeout=10, source_address=("10.129.38.51", 6000))
        connection.request("GET", "/portal/index.html")
        httpResponse = connection.getresponse()
        connection.close()

httpResponse.status is 200, but I don't see the port number anywhere in the response headers.

Maybe I should be using some lower level socket functionality? If so, which is simplest and supports both HTTP and FTP? Btw, I only want to use built-in modules, nothing which I have to install.

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[Update] I should have made it clearer; I really do need to get the actual port number received in the response, not just remember it.

Answer 1

To complete @TimSpence answer, you can use a socket object as an interface for your connection and then treat with some API your data as an HTTP object.

host = 'xxx.xxx.xxx.xxx'
port = 80
address = (host, port)

## socket object interface for a TCP connection
listener_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM,
                                socket.IPPROTO_TCP)
listener_socket.bind(address)
listener_socker.listen(MAX_CONNECTIONS)

## new_connection is the connection object you use to handle the data echange
## source_address (source_host, source_port) is the address object
##    source_port is what you're looking for
new_connection, source_address = listener_socket.accept()

data = new_connection.recv(65536)

## handle data as an HTTP object(for example as an HTTP request)

new_connection.close()