How to use Flask get client's port?

Question

I\'m trying to build a simple torrent-tracker with Flask, but I meet a problem.

If client in NAPT network, the port, which included in request is in

Answer 1

If Flask is behind a reverse proxy,

request.environ.get('REMOTE_PORT')

will not give you what you want, you are going to get the port used by the reverse proxy.

If using Nginx, add this bold line to your config file:

server {
    listen 80;
    server_name _;
    location / {
        proxy_pass ...;
        proxy_set_header WHATEVER $remote_port;
    } 
} 

Then you can get the client port with :

request.headers.get('WHATEVER')

Answer 2

You can get it from request.environ

request.environ.get('REMOTE_PORT')