nginx.conf

worker_processes  1;
error_log /dev/stderr warn;

events {
    worker_connections 1024;
}

# make sure to set plaintext JWT_SECRET and JWT_ISS environment variable
env JWT_SECRET;
env JWT_ISS;

http {

    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log /dev/stdout main;

    lua_package_path "/usr/local/openresty/lualib/?.lua;;";

    server {
        listen 8080;

        location /secure {
            access_by_lua_file /bearer.lua;

            default_type text/plain;
            echo "<p>i am protected by jwt<p>";
        }

        location /request {
            access_by_lua_file /bearer.lua;

            # CORs
            if ($request_method = 'OPTIONS') {
                add_header 'Access-Control-Allow-Origin' '*';
                add_header 'Access-Control-Allow-Credentials' 'true';
                add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
                add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type';
                add_header 'Access-Control-Max-Age' 86400;
                add_header 'Content-Type' 'text/plain charset=UTF-8';
                add_header 'Content-Length' 0;
                return 204; break;
            }
            if ($request_method = 'POST') {
                add_header 'Access-Control-Allow-Origin' '*';
                add_header 'Access-Control-Allow-Credentials' 'true';
                add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
                add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type';
            }
            if ($request_method = 'GET') {
                add_header 'Access-Control-Allow-Origin' '*';
                add_header 'Access-Control-Allow-Credentials' 'true';
                add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
                add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type';
            }

            # HTTP 1.1 support
            proxy_http_version 1.1;
            proxy_buffering off;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

            # Forward JWT Token
            proxy_set_header Authorization $http_authorization;

            # Mitigate httproxy attack
            proxy_set_header Proxy "";

            proxy_pass http://mockbin.org/request;
            proxy_connect_timeout 60s;
            proxy_send_timeout 60s;
            proxy_read_timeout 60s;
            send_timeout 60s;
            client_max_body_size 1M;
        }

        location / {
            default_type text/html;
            content_by_lua '
                ngx.say("<p>hello, unprotected lua world</p>")
            ';
        }
    }
}