Simple python webserver with HTTP header printing

server.py

import sys

from http.server import SimpleHTTPRequestHandler, HTTPServer

DEFAULT_PORT=8080

class RequestHandler(SimpleHTTPRequestHandler):
    def do_GET(self):
        print(self.headers)
        SimpleHTTPRequestHandler.do_GET(self)

if __name__ == "__main__":

    port = DEFAULT_PORT
    if len(sys.argv)  > 1:
        try:
            port = int(sys.argv[1])
        except ValueError:
            print(f"{sys.argv[1]} is not a valid port")
            sys.exit(0)

    httpd = HTTPServer(('', port), RequestHandler)
    print(f"Serving at port {port}")
    httpd.serve_forever()