def _read_write(self, soc, max_idling=20):
        iw = [self.connection, soc]
        ow = []
        count = 0
        while 1:
            count += 1
            (ins, _, exs) = select.select(iw, ow, iw, 3)
            if exs: break
            if ins:
                for i in ins:
                    if i is soc:
                        out = self.connection
                    else:
                        out = soc
                    data = i.recv(8192)
                    if data:
		      if 'image/png' in data:
			#for s in self.headers:
			#  print s + ": " + self.headers[s]
			global imagenum
			fp = open("/home/tom/proxytest/" + str(imagenum) + ".png", "wb")
			imagenum = imagenum + 1
			pos = data.find("Content-Length: ");
			if(pos > 0):
			  sz = data[pos+16:data.find('\n', pos)-1]#+16 to account for "content-length: ", -1 to account for \r
			  print "Image size is: " + sz
			  print "Writing image (test " + str(imagenum) + ") ... \n"
			  image_start = data.find("\r\n\r\n")+4
			  print
			  if(int(sz) > len(data) - image_start): #if reported data size is greater than the amount of already-fetched data minus the header
			    fp.write(data[image_start:])
			    total = len(data[image_start:])
			    while(total < int(sz)):
			      global count
			      out.send(data)
			      count = 0
			      data = i.recv(8192)
			      fp.write(data)
			      total = total + len(data)
			  else:
			    fp.write(data[image_start:])
			  fp.close()
			else: #data is not in the response, and we don't know the size
                          #here data contains just the header, so send that and read more before writing to file
			  while True:
			    global count
			    out.send(data)
			    count = 0
			    data = i.recv(8192)
			    fp.write(data)
			    if(len(data) != 8192):
			      break
			  fp.close()


		      out.send(data)
                      count = 0
            else:
                print "\t" "idle", count
            if count == max_idling: break