import argparse

from http.server import BaseHTTPRequestHandler, HTTPServer

DEFAULT_HOST = '127.0.0.1'
DEFAULT_PORT = 8800

class RequestHandler(BaseHTTPRequestHandler):
    """ Custom request handler"""
    
    def do_GET(self):
        """ Handler for the GET requests """
        self.send_response(200)
        self.send_header('Content-type','text/html')
        self.end_headers()
        # Send the message to browser
        self.wfile.write(b"Hello from server!")
        return

class CustomHTTPServer(HTTPServer):
    "A custom HTTP server"
    def __init__(self, host, port):
        server_address = (host, port)
        HTTPServer.__init__(self, server_address, RequestHandler) 

def run_server(port):
    try:
        server= CustomHTTPServer(DEFAULT_HOST, port)
        print ("Custom HTTP server started on port: %s" % port)
        server.serve_forever()
    except Exception as err:
        print ("Error:%s" %err)
    except KeyboardInterrupt:
        print ("Server interrupted and is shutting down...")
        server.socket.close()

if __name__ == "__main__":
    parser = argparse.ArgumentParser(description='Simple HTTP Server Example')
    parser.add_argument('--port', action="store", dest="port", type=int, default=DEFAULT_PORT)
    given_args = parser.parse_args() 
    port = given_args.port
    run_server(port)