Foundations of Python

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HTTP request using Socket

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Python supports socket programming by providing 'socket' module. Socket programming enables connections and communications between two nodes. One node runs a process that listens for the requests on a particular port while another node sends the requests. It's a server-client relationship between two nodes.

In the below example, we connect to any public website like over port 80 using ipv4 address family (socket.AF_INET) over TCP protocol (sokcet.SOCK_STREAM). For UDP protocol, you can use socket.SOCK_DGRAM.

import socket
import sys

hostname = ""

    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    print ("Socket successfully created here")
except socket.error as err:
    print ("Socket creation failed here with error %s" %(err))

# default port for socket
port = 80

    host_ip = socket.gethostbyname(hostname)
except socket.gaierror:
    print ("Error resolving the host")

# connecting to the server
s.connect((host_ip, port))

print (f"Socket successfully connected to {hostname}")

Writing a simple server-client program

We will create 2 programs - one will act as server while another will act as client.

#server side program
import socket
# create a socket object
s = socket.socket()
print ("Socket successfully created")
# choose any random available port
port = 4042

# Next bind to the port
# empty string makes listen from all computers in the network
s.bind(('', port))
print ("socket binded to %s" %(port))
# start listening
print ("socket started listening")

# a forever loop until we interrupt it or
# an error occurs
counter = 0
while counter < 5:
    # Keep establishing connection with clients
    c, addr = s.accept()
    print ('Got a connection from', addr )
    counter+= 1
    # send a message to the client. encoding to send byte type.
    c.send('We listened to you'.encode())
    # Close the connection with the client
    # Breaking once connection closed

# client side program
import socket
# Create a socket object
s = socket.socket()
# port where server side program is listening
port = 4042
# connect to the server on local computer
s.connect(('', port))
# receive data from the server and decoding to get the string.
print (s.recv(1024).decode())
# close the connection

Start the server process. python

Start the client process. python

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