dokku-prerender/nginx-default.conf at main · PythonicCafe/dokku-prerender · GitHub

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map $http_user_agent $use_prerender {
    default 0;
    "~*(360Spider|AdsBot-Google|AhrefsBot|AhrefsSiteAudit|Amazonbot|Applebot|Arquivo-web-crawler|Baiduspider|BingPreview|Bingbot|Bitrix link preview|CCBot|Chrome-Lighthouse|Crawler|Discordbot|DotBot|DuckDuckBot|Facebot|Feedly|Google-Extended|Google-InspectionTool|GoogleOther|Googlebot|GrapeshotCrawler|HubSpot Crawler|Iframely|LinkedInBot|MJ12bot|Mastodon|MojeekBot|Neevabot|PetalBot|Qwantify|SISTRIX Crawler|Screaming Frog SEO Spider|SemrushBot|SeznamBot|SkypeUriPreview|Slack-ImgProxy|Slackbot|Sogou web spider|Storebot-Google|TelegramBot|TinEye-bot|Twitterbot|WhatsApp|XoviBot|Yahoo! Slurp|Yandex|Yeti|YisouSpider|ZoominfoBot|bitlybot|coccocbot|developers\.google\.com/\+/web/snippet|embedly|facebookexternalhit|ia_archiver|outbrain|pinterestbot|proximic|quora link preview|redditbot|rogerbot|search\.ch|serpstatbot|vkShare|yacybot)" 1;
}

map $request_uri $skip_prerender {
    default 0;
    "~*\.(css|js|eot|eot2|woff|woff2|otf|ttf|otc|sfnt)$" 1;
    "~*\.(gif|ico|jpeg|jpg|png|svg|tiff|bmp|webp|avif|jxl|heic|heif)$" 1;
    "~*\.(mp3|mp4|webm|ogg|wav|flac|m4a|m4v|avi|mov|mkv|mpg|mpeg|wmv|swf)$" 1;
    "~*\.(txt|json|xml|csv|pdf|doc|docx|xls|xlsx|ppt|pptx|rtf|odt|ods|odp)$" 1;
    "~*\.(zip|rar|7z|tar|gz|bz2|tgz)$" 1;
    "~*\.(less|sass|scss|styl|coffee|ts)$" 1;
    "~*\.(wasm|manifest|appcache)$" 1;
    "~*/(robots|ads)\.txt$" 1;
}

server {
    listen 80;
    server_name  localhost;
    root   /usr/share/nginx/html;
    index  index.html index.htm;
    error_page   500 502 503 504  /50x.html;

    location / {
        resolver 8.8.8.8;
        set $prerenderServer "prerender.example.net"; # Replace with your prerender instance
        set $prerender 0;
        if ($use_prerender = 1) {
            set $prerender 1;
        }
        if ($skip_prerender = 1) {
            set $prerender 0;
        }

        if ($prerender = 1) {
            # The `https` on the `rewrite` line forces HTTPS instead of using $scheme (so prerender will always access)
            # your original website using HTTPS.
            # The `https` on the `proxy_pass` line forces Nginx to access your prerender server using HTTPS.
            rewrite .* /https://$host$request_uri;
            proxy_pass https://$prerenderServer;
            break;
        }

        # If prerender is not activated, try to serve static files instead
        try_files $uri $uri/index.html /index.html;
    }
}