http server in python
# this program serves files from the server, if not found then returns 404
# Import socket module
from socket import *
# Create a TCP server socket
#(AF_INET is used for IPv4 protocols)
#(SOCK_STREAM is used for TCP)
serverSocket = socket(AF_INET, SOCK_STREAM)
# Assign a port number
serverPort = 6789
# Bind the socket to server address and server port
serverSocket.bind(("", serverPort))
# Listen to at most 1 connection at a time
serverSocket.listen(1)
# Server should be up and running and listening to the incoming connections
while True:
print('Ready to serve...')
# Set up a new connection from the client
connectionSocket, addr = serverSocket.accept()
# If an exception occurs during the execution of try clause
# the rest of the clause is skipped
# If the exception type matches the word after except
# the except clause is executed
try:
# Receives the request message from the client
message = connectionSocket.recv(1024)
# Extract the path of the requested object from the message
# The path is the second part of HTTP header, identified by [1]
filename = message.split()[1]
# Because the extracted path of the HTTP request includes
# a character '', we read the path from the second character
f = open(filename[1:])
# Store the entire contenet of the requested file in a temporary buffer
outputdata = f.read()
# Send the HTTP response header line to the connection socket
connectionSocket.send(str.encode("HTTP/1.1 200 OKrnrn"))
# Send the content of the requested file to the connection socket
for i in range(0, len(outputdata)):
connectionSocket.send(str.encode(outputdata[i]))
connectionSocket.send(str.encode("rn"))
# Close the client connection socket
connectionSocket.close()
except IOError:
# Send HTTP response message for file not found
connectionSocket.send(str.encode("HTTP/1.1 404 Not Foundrnrn"))
connectionSocket.send(str.encode("<html><head></head><body><h1>404 Not Found</h1></body></html>rn"))
# Close the client connection socket
connectionSocket.close()
serverSocket.close()