Only once response HTTP server

once.py

#!/usr/bin/env python
from http.server import HTTPServer, SimpleHTTPRequestHandler
import signal
import sys
import os


class OnceHttpServer(HTTPServer):
    def shutdown_by_signal(self, sig_num, frame):
        self.server_close()
        sys.exit(0)

    def process_request(self, request, client_address):
        super().process_request(request, client_address)
        signal.setitimer(signal.ITIMER_REAL, 0.5, 0.5)


def run(server_class=OnceHttpServer, handler_class=SimpleHTTPRequestHandler):
    server_address = ('0.0.0.0', int(os.environ.get('PORT', 8000)))
    httpd = server_class(server_address, SimpleHTTPRequestHandler)
    signal.signal(signal.SIGALRM, httpd.shutdown_by_signal)
    httpd.serve_forever(2)


if __name__ == '__main__':
    run()