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#!/usr/bin/env python

import socket
import time

TCP_HOST = 'stackoverflow.com' # This is the host we are going to query
TCP_PORT = 80 # This is the standard port for HTTP protocol
MAX_LIMIT = 1024 # This is the maximum size of the info we want in bytes

# Create the string to talk HTTP/1.1
MESSAGE = \
"GET /questions/23602412/only-download-a-part-of-the-document-using-python-requests HTTP/1.1\r\n" \
"HOST: stackoverflow.com\r\n" \
"User-Agent: Custom/0.0.1\r\n" \
"Accept: */*\r\n\n"

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) # Create a socket
s.connect((TCP_HOST, TCP_PORT)) # Connect to remote socket at given address
s.send(MESSAGE) # Let's begin the transaction

time.sleep(0.1) # Machines are involved, but... oh, well!

# Keep reading from socket till max limit is reached
curr_size = 0
data = ""
while curr_size < MAX_LIMIT:
    data += s.recv(MAX_LIMIT - curr_size)
    curr_size = len(data)

s.close() # Mark the socket as closed

# Everyone likes a happy ending!
print data + "\n"
print "Length of received data:", len(data)