Multithreaded web server in python
I'm trying to create multithreaded web server in python, but it only responds to one request at a time and I can't figure out why. Can you help me, please?
#!/usr/bin/env python2
# -*- coding: utf-8 -*-
from SocketServer import ThreadingMixIn
from BaseHTTPServer import HTTPServer
from SimpleHTTPServer import SimpleHTTPRequestHandler
from time import sleep
class ThreadingServer(ThreadingMixIn, HTTPServer):
pass
class RequestHandler(SimpleHTTPRequestHandler):
def do_GET(self):
self.send_response(200)
self.send_header('Content-type', 'text/plain')
sleep(5)
response = 'Slept for 5 seconds..'
self.send_header('Content-length', len(response))
self.end_headers()
self.wfile.write(response)
ThreadingServer(('', 8000), RequestHandler).serve_forever()
Check this post from Doug Hellmann's blog.
from BaseHTTPServer import HTTPServer, BaseHTTPRequestHandler
from SocketServer import ThreadingMixIn
import threading
class Handler(BaseHTTPRequestHandler):
def do_GET(self):
self.send_response(200)
self.end_headers()
message = threading.currentThread().getName()
self.wfile.write(message)
self.wfile.write('\n')
return
class ThreadedHTTPServer(ThreadingMixIn, HTTPServer):
"""Handle requests in a separate thread."""
if __name__ == '__main__':
server = ThreadedHTTPServer(('localhost', 8080), Handler)
print 'Starting server, use <Ctrl-C> to stop'
server.serve_forever()
I have developed a PIP Utility called ComplexHTTPServer that is a multi-threaded version of SimpleHTTPServer.
To install it, all you need to do is:
pip install ComplexHTTPServer
Using it is as simple as:
python -m ComplexHTTPServer [PORT]
(By default, the port is 8000.)
In python3, you can use the code below (https or http):
from http.server import HTTPServer, BaseHTTPRequestHandler
from socketserver import ThreadingMixIn
import threading
USE_HTTPS = True
class Handler(BaseHTTPRequestHandler):
def do_GET(self):
self.send_response(200)
self.end_headers()
self.wfile.write(b'Hello world\t' + threading.currentThread().getName().encode() + b'\t' + str(threading.active_count()).encode() + b'\n')
class ThreadingSimpleServer(ThreadingMixIn, HTTPServer):
pass
def run():
server = ThreadingSimpleServer(('0.0.0.0', 4444), Handler)
if USE_HTTPS:
import ssl
server.socket = ssl.wrap_socket(server.socket, keyfile='./key.pem', certfile='./cert.pem', server_side=True)
server.serve_forever()
if __name__ == '__main__':
run()
You will figure out this code will create a new thread to deal with every request.
Command below to generate self-sign certificate:
openssl req -x509 -newkey rsa:4096 -nodes -out cert.pem -keyout key.pem -days 365
If you are using Flask, this blog is great.
It's amazing how many votes these solutions that break streaming are getting. If streaming might be needed down the road, then ThreadingMixIn and gunicorn are no good because they just collect up the response and write it as a unit at the end (which actually does nothing if your stream is infinite).
Your basic approach of combining BaseHTTPServer with threads is fine. But the default BaseHTTPServer settings re-bind a new socket on every listener, which won't work in Linux if all the listeners are on the same port. Change those settings before the serve_forever() call. (Just like you have to set self.daemon = True on a thread to stop ctrl-C from being disabled.)
The following example launches 100 handler threads on the same port, with each handler started through BaseHTTPServer.
import time, threading, socket, SocketServer, BaseHTTPServer
class Handler(BaseHTTPServer.BaseHTTPRequestHandler):
def do_GET(self):
if self.path != '/':
self.send_error(404, "Object not found")
return
self.send_response(200)
self.send_header('Content-type', 'text/html; charset=utf-8')
self.end_headers()
# serve up an infinite stream
i = 0
while True:
self.wfile.write("%i " % i)
time.sleep(0.1)
i += 1
# Create ONE socket.
addr = ('', 8000)
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(100)]
time.sleep(9e9)
A multithreaded https server in python3.7
from http.server import BaseHTTPRequestHandler, HTTPServer
from socketserver import ThreadingMixIn
import threading
import ssl
hostName = "localhost"
serverPort = 8080
class MyServer(BaseHTTPRequestHandler):
def do_GET(self):
self.send_response(200)
self.send_header("Content-type", "text/html")
self.end_headers()
self.wfile.write(bytes("<html><head><title>https://pythonbasics.org</title></head>", "utf-8"))
self.wfile.write(bytes("<p>Request: %s</p>" % self.path, "utf-8"))
self.wfile.write(bytes("<p>Thread: %s</p>" % threading.currentThread().getName(), "utf-8"))
self.wfile.write(bytes("<p>Thread Count: %s</p>" % threading.active_count(), "utf-8"))
self.wfile.write(bytes("<body>", "utf-8"))
self.wfile.write(bytes("<p>This is an example web server.</p>", "utf-8"))
self.wfile.write(bytes("</body></html>", "utf-8"))
class ThreadingSimpleServer(ThreadingMixIn,HTTPServer):
pass
if __name__ == "__main__":
webServer = ThreadingSimpleServer((hostName, serverPort), MyServer)
webServer.socket = ssl.wrap_socket(webServer.socket, keyfile='./privkey.pem',certfile='./certificate.pem', server_side=True)
print("Server started http://%s:%s" % (hostName, serverPort))
try:
webServer.serve_forever()
except KeyboardInterrupt:
pass
webServer.server_close()
print("Server stopped.")
you can test it in a browser: https://localhost:8080
the running result is:
enter image description here
enter image description here
remind that you can generate your own keyfile and certificate use
$openssl req -newkey rsa:2048 -keyout privkey.pem -x509 -days 36500 -out certificate.pem
To learn details about creating self-signed certificate with openssl:https://www.devdungeon.com/content/creating-self-signed-ssl-certificates-openssl