worker_processes 2;
error_log stderr warn;
pid /run/nginx.pid;

events {
    worker_connections 1024;
}

http {
    include mime.types;
    default_type application/octet-stream;

    # Define custom log format to include response times
    log_format main_timed '$remote_addr - $remote_user [$time_local] "$request" '
                          '$status $body_bytes_sent "$http_referer" '
                          '"$http_user_agent" "$http_x_forwarded_for" '
                          '$request_time $upstream_response_time $pipe $upstream_cache_status';

    access_log /dev/stdout main_timed;
    error_log /dev/stderr notice;

    keepalive_timeout 65;

    client_body_temp_path /tmp/client_temp;
    proxy_temp_path /tmp/proxy_temp_path;
    fastcgi_temp_path /tmp/fastcgi_temp;
    uwsgi_temp_path /tmp/uwsgi_temp;
    scgi_temp_path /tmp/scgi_temp;

    map $http_user_agent $prerender_ua {
        default       0;
        "~*Prerender" 0;

        "~*googlebot"                               1;
        "~*yahoo!\ slurp"                           1;
        "~*bingbot"                                 1;
        "~*yandex"                                  1;
        "~*baiduspider"                             1;
        "~*facebookexternalhit"                     1;
        "~*twitterbot"                              1;
        "~*rogerbot"                                1;
        "~*linkedinbot"                             1;
        "~*embedly"                                 1;
        "~*quora\ link\ preview"                    1;
        "~*showyoubot"                              1;
        "~*outbrain"                                1;
        "~*pinterest\/0\."                          1;
        "~*developers.google.com\/\+\/web\/snippet" 1;
        "~*slackbot"                                1;
        "~*vkshare"                                 1;
        "~*w3c_validator"                           1;
        "~*redditbot"                               1;
        "~*applebot"                                1;
        "~*whatsapp"                                1;
        "~*flipboard"                               1;
        "~*tumblr"                                  1;
        "~*bitlybot"                                1;
        "~*skypeuripreview"                         1;
        "~*nuzzel"                                  1;
        "~*discordbot"                              1;
        "~*google\ page\ speed"                     1;
        "~*qwantify"                                1;
        "~*pinterestbot"                            1;
        "~*bitrix\ link\ preview"                   1;
        "~*xing-contenttabreceiver"                 1;
        "~*chrome-lighthouse"                       1;
        "~*telegrambot"                             1;
    }

    map $args $prerender_args {
        default $prerender_ua;
        "~(^|&)_escaped_fragment_=" 1;
    }

    map $http_x_prerender $x_prerender {
        default $prerender_args;
        "1"     0;
    }

    map $uri $prerender {
        default $x_prerender;
        "~*\.(js|css|xml|less|png|jpg|jpeg|gif|pdf|doc|txt|ico|rss|zip|mp3|rar|exe|wmv|doc|avi|ppt|mpg|mpeg|tif|wav|mov|psd|ai|xls|mp4|m4a|swf|dat|dmg|iso|flv|m4v|torrent|ttf|woff|svg|eot)" 0;
    }

    # Default server definition
    server {
        listen [::]:3000 default_server;
        listen 3000 default_server;

        sendfile off;

        root /app;
        index index.html;

        location / {
            if ($prerender = 1) {
                rewrite (.*) /prerenderio last;
            }

            try_files $uri $uri/ /index.html;
            etag off;
            add_header Cache-Control "public, max-age=31536000, immutable";
        }

        location /prerenderio {
            if ($prerender = 0) {
                return 404;
            }

            proxy_set_header X-Prerender-Token xxx;

            #resolve using Google's DNS server to force DNS resolution and prevent caching of IPs
            resolver 8.8.8.8 8.8.4.4;
            rewrite .* /https://$host$request_uri? break;
            proxy_pass https://service.prerender.io;
        }
    }

    gzip on;
    gzip_static on;
    gzip_proxied any;
    gzip_types text/plain application/xml text/css text/js text/xml application/x-javascript application/javascript text/javascript application/json application/xml+rss;
    gzip_vary on;
    gzip_disable "msie6";
    gzip_comp_level 6;
    gzip_buffers 16 8k;

    include /etc/nginx/conf.d/*.conf;
}