nginx proxy_set_header

app.psgi

use strict;
use warnings;

my $app = sub {
    my ($env) = @_;
    return [ 200, [ 'Content-Type' => 'text/plain' ], [ "HTTP_HOST: $env->{HTTP_HOST}" ] ];
};

exec.sh

#!/bin/bash

trap 'kill $(jobs -p) && sudo nginx -s quit' EXIT

sudo nginx -c $PWD/nginx.conf
plackup &

open 'http://localhost:5001'
open 'http://localhost:5002'

wait

nginx.conf

events {
    worker_connections 1024;
}

http {

    server {
        listen 5001;

        proxy_set_header Host header1;
        proxy_set_header Host header2;

        location / {
            proxy_pass http://localhost:5000;
            # => HTTP_HOST: header1, header2
        }
    }

    server {
        listen 5002;

        proxy_set_header Host header1;

        location / {
            proxy_set_header Host header2;
            proxy_pass http://localhost:5000;
            # => HTTP_HOST: header2
        }
    }
}