如何将 NGINX 配置为仅服务器一个 static 文件？

Question

Our Rails application is running on puma/nginx below part of the NGINX configuration.

What's I'm trying to achieve is that when the request URL is http://example.com it will serve a static cached file from /public/cached_pages/index.html and in all other cases works like it is now so passing the request to rails/puma

upstream rails {
  server unix:///var/www/html/cms/shared/sockets/puma.sock;
}


   location / {
       proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
       add_header Cache-Control "public";
       expires 2d;
       proxy_set_header Host $http_host;
       proxy_set_header  X-Forwarded-Proto $scheme;
       proxy_set_header  X-Forwarded-Ssl on; # Optional
       proxy_set_header  X-Forwarded-Port $server_port;
       proxy_pass http://rails;
  }

Answer 1

I am not sure if it is the best solution, but did you try try_files ? ( Nginx docs ) In the rails context this is often used for assets, but might also work for your cache. The asset example would be something like this:

  try_files $uri/index.html $uri @app_production;
  location @app_production {
[...]
    proxy_redirect off;
    proxy_pass http://app_production;

The first line would need to be adjusted to your needs, but this might also work for your case.

Answer 2

You should use the location directive

  location = / {
    gzip_static on;
    root public/cached_pages
    index.html
  }

The = symbol will provide an exact match for the url, without the = symbol you will be matching any path whatsoever after the domain name. Next, switching gzip on will compress the file to reduce traffic bandwidth so that the index.html page will be zipped then setting the root directive to be the path to the file will enable nginx to find the file you want to serve, then the actual file itself should do the trick for you.

The root directive may need the full path to the folder rather than the relative public path, Obviously I do not know what that will be.