nginx - Prerendering html if they exist for bots but users use proxy - Stack Overflow

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I'm pretty new to nginx and would love some insight on how to get this to work. Basically I have a proxy set up for my angular app that I want users to use. If it is a google bot, I want to check if I have a prerendered html (for seo) and if I do return that instead. However, nginx is testing my patience lol. How can I get my config to serve the html? Right now I can return the path to the file and the file is there but can't get seem to serve it.

I've tried using try_files $static_file @proxy but that just gave me 404s and 403s. I know there has to be some way to make this work. Please HELP!

sites-enabled for reference

    location / {
        set $isBot 0;
        if ($http_user_agent ~* "googlebot| a bunch more but I removed them for now">
            set $isBot 1;
        }

        set $static_file /var/www/main/static$uri/index.html;

        set $render 0;
        if (-f $static_file) {
          set $render 1$isBot;
        }

        if ($render = 11) {
          # TODO HELP just serve this html I cant get it to work
          rewrite ^ $static_file;
        }

        # proxy to my server running spa
        proxy_pass http://localhost:4200;
        proxy_http_version 1.1;
        proxy_buffering off;
        proxy_connect_timeout 60s;
        proxy_read_timeout 5400s;
        proxy_send_timeout 5400s;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_cache_bypass $http_upgrade;
    }

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