Built-in

• Python 2: Linux Bash syntax

python -m SimpleHTTPServer 8888 &

• for Python 3+

python3 -m http.server 8888 &

Socket

import socket

IP_TRANSPARENT = 19

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.setsockopt(socket.IPPROTO_IP, IP_TRANSPARENT, 1)

s.bind(('127.0.0.1', 1234))
s.listen(32)
print("[+] Bound to tcp://127.0.0.1:1234")
while True:
    c, (r_ip, r_port) = s.accept()
    l_ip, l_port = c.getsockname()
    print("[ ] Connection from tcp://%s:%d to tcp://%s:%d" % (r_ip, r_port, l_ip, l_port))
    c.send(b"hello world\n")
    c.close()

After running the server you can connect to it from arbitrary IP addresses with netcat (nc)

nc -v 192.0.2.1 9999

Connection to 192.0.2.1 9999 port [tcp/*] succeeded!
hello world

The server will report the connection indeed was directed to 192.0.2.1 port 9999, even though nobody actually listens on that IP address and port:

sudo python3 server.py

[+] Bound to tcp://127.0.0.1:1234
[ ] Connection from tcp://127.0.0.1:60036 to tcp://192.0.2.1:9999

from: https://blog.cloudflare.com/how-we-built-spectrum/

Others

• Apache + mod_python
• http://flask.pocoo.org/