Simple HTTP GET Server - Python

httpServ.py

import socket
import os
import mimetypes
import sys
import pathlib # using pathlib to create a universal object that can be used in unix or windows alike

HOST = '127.0.0.1'
PORT = 8888

class HTTPServ:
    def __init__(self, host = '127.0.0.1', port = 80):
        self.host = host
        self.port = port
    
    def startServ(self):
        try:
            with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
                s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
                s.bind((self.host, self.port)) #
                s.listen()
                while True:
                    # waiting for connection
                    conn, addr = s.accept()
                    with conn:
                        print('Connected by', addr)
                        # get client request
                        request = conn.recv(1024)
                        response = self.handle_request(request)
                        conn.sendall(response)
        except PermissionError:
            print('Permission Error, check firewall.')
            sys.exit(1)
        except OSError:
            print('Address already in use. Exiting.')
            sys.exit(1)


    def handle_request(self, request):
        # handling request types
        headers = request.decode().split('/n')
        if headers[0].startswith('GET'):
            return self.handle_GET(headers)
        else:
            return b'HTTP/1.1 200 OK\n\nDidn\'t recieve GET request'
            

    def handle_GET(self, headers):
        # calling appropriate methods for different GET request type
        filename = headers[0].split()[1]
        if filename == '/': # if no adders was given we open index.html
            filename = '/index.html'
        return self.get_request(filename)

    def get_request(self, filename):
        # parsing regular http request
        try:
            filename = filename[0].strip('/') + filename[1:] # remove slash from URL
            with pathlib.Path(filename).open(mode = 'rb') as file:
                response_line = b'HTTP/1.1 200 OK'
                content = file.read()
                headers = b'Content-Type: ' + mimetypes.guess_type(filename)[
                    0].encode()  # if nothing is found, just send `text/html`
                blank_line = b'\r\n'
                response = b''.join([response_line, blank_line, headers, blank_line, blank_line, content])
        except FileNotFoundError:
            response = b'HTTP/1.0 404 NOT FOUND\n\nFile Not Found'
        return response


if __name__ == '__main__':
    server = HTTPServ(HOST, PORT)
    server.startServ()