http.py

import time, threading, socket, SocketServer, BaseHTTPServer, SimpleHTTPServer

class Handler(SimpleHTTPServer.SimpleHTTPRequestHandler):
    def do_GET(self):
        header = 'X-Forwarded-For'
        ip_address = self.headers[header]
        if header is not None:
            reversed_dns = socket.gethostbyaddr(ip_address)
            print 'Serving for %s (%s)' % (ip_address, reversed_dns[0])
        return SimpleHTTPServer.SimpleHTTPRequestHandler.do_GET(self)

# Create ONE socket.
addr = ('', 12384)
sock = socket.socket (socket.AF_INET, socket.SOCK_STREAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.bind(addr)
sock.listen(5)

# Launch 100 listener threads.
class Thread(threading.Thread):
    def __init__(self, i):
        threading.Thread.__init__(self)
        self.i = i
        self.daemon = True
        self.start()
    def run(self):
        httpd = BaseHTTPServer.HTTPServer(addr, Handler, False)

        # Prevent the HTTP server from re-binding every handler.
        # https://stackoverflow.com/questions/46210672/
        httpd.socket = sock
        httpd.server_bind = self.server_close = lambda self: None

        httpd.serve_forever()
[Thread(i) for i in range(20)]
time.sleep(9e9)