docker/mod/nginx/bbb/demo.nginx

         # Forward request to /demo to tomcat.  This is for
         # the BigBlueButton api demos.
       location /demo {
           proxy_pass         http://host.docker.internal:8080;
           proxy_redirect     default;
           proxy_set_header   X-Forwarded-For   $proxy_add_x_forwarded_for;

        # Allow 30M uploaded presentation document.
           client_max_body_size       30m;
           client_body_buffer_size    128k;

           proxy_connect_timeout      90;
           proxy_send_timeout         90;
           proxy_read_timeout         90;

           proxy_buffer_size          4k;
           proxy_buffers              4 32k;
           proxy_busy_buffers_size    64k;
           proxy_temp_file_write_size 64k;

           include    fastcgi_params;
       }