gistfile1.py

import httplib
class Instrumented(httplib.HTTPResponse):

    def close(self):
        print "close intercepted!!!!!"
        import traceback
        traceback.print_stack()
        if self.fp:
            self.fp.close()
            self.fp = None

httplib.HTTPResponse = Instrumented
httplib.HTTPConnection.response_class = Instrumented

import requests
import os
import subprocess
pid = os.getpid()
reqsess = requests.session()


try:
        #r = reqsess.get(r'http://www.mouser.com/Search/Refine.aspx?Keyword=test')
        r = reqsess.get(r'http://www.google.in/')
        d = r.text
finally:
        reqsess.close()

print "_fp is", r.history[0].raw._fp
print "_fp.fp is", r.history[0].raw._fp.fp

print 'done, calling lsof'
subprocess.call("lsof -p%d -a -iTCP" % (pid,), shell=True)
print 'done'