Chapter 7

Enter the target host name to connect:
http://www.asgdfdfdkflakslalalasdsdsds.invalid

Enter the target port: 80

Failed to connect to http://www.asgdfdfdkflakslalalasdsdsds.invalid on port
80

Reason: [Errno -2] Name or service not known

Now, let's exchange some data with the server. The following code is an example of a
simple TCP client:

import socket

HOST = 'www.linux.org' # or 'localhost'

PORT = 80

BUFSIZ = 4096

ADDR = (HOST, PORT)

if __name__ == '__main__':

client_sock = socket.socket(socket.AF_INET,

socket.SOCK_STREAM)

client_sock.connect(ADDR)

while True:

data = 'GET / HTTP/1.0\r\n\r\n'

if not data:

break

client_sock.send(data.encode('utf-8'))

data = client_sock.recv(BUFSIZ)

if not data:

break

print(data.decode('utf-8'))

client_sock.close()

If you look carefully, you can see that the preceding code actually created a raw
HTTP client that fetches a web page from a web server. It sends an HTTP GET
request to pull the home page:

python 7_2_simple_tcp_client.py

HTTP/1.1 200 OK

Date: Sat, 07 Mar 2015 16:23:02 GMT

Server: Apache

Last-Modified: Mon, 17 Feb 2014 03:19:34 GMT

Accept-Ranges: bytes