from __future__ import print_function

from sys import argv
from pprint import pformat

from twisted.internet.task import react
from twisted.web.client import Agent, readBody
from twisted.web.http_headers import Headers


def cbRequest(response):
    print('Response version:', response.version)
    print('Response code:', response.code)
    print('Response phrase:', response.phrase)
    print('Response headers:')
    print(pformat(list(response.headers.getAllRawHeaders())))
    d = readBody(response)
    d.addCallback(cbBody)
    return d

def cbBody(body):
    print('Response body:')
    print(body)

def main(reactor, url=b"http://example.com/"):
    agent = Agent(reactor)
    d = agent.request(
        'GET', url,
        Headers({'User-Agent': ['Twisted Web Client Example']}),
        None)
    d.addCallback(cbRequest)
    return d

react(main, argv[1:])