Nginx reverse proxy config

default.conf

server {
    listen       80;
    server_name  localhost;

    # error logs location when running nginx-debug
    error_log /etc/nginx/logs/error.log debug;

    location / {
        root   /usr/share/nginx/html;
        index  index.html index.htm;

        try_files $uri $uri/ /index.html;

        add_header Cache-Control "no-cache, must-revalidate";
    }

    location /api/ {
        proxy_pass http://gunicorn:5000/;
        # nginx by default makes http 1.0 requests when proxying, Istio requires >=1.1
        proxy_http_version 1.1;
        proxy_redirect http://gunicorn:5000/ /api/;
        # setting the Host header is required for Istio,
        # the Istio proxy expects the Host to be the destination service e.g. gunicorn[1]
        #
        # [1] https://groups.google.com/forum/#!topic/istio-users/H4sOD2wev3U
        proxy_set_header Host gunicorn;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }
}