nginx.conf

server {
   listen 8080;
   listen [::]:8080;
   server_name _;

   client_max_body_size 4G;

   # path for static files
   # root /path/to/app/current/public;
   # We are only proxying - not returning any files
   #root /dev/null;

   location / {
     proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
     proxy_set_header X-Forwarded-Proto $scheme;
     proxy_set_header Host $http_host;
     # we don't want nginx trying to do something clever with
     # redirects, we set the Host: header above already.
     proxy_redirect off;
     proxy_pass http://merginmaps-web;
   }

   # proxy to backend
   # we need to disable buffering for these endpoints which use stream (up or down)
   # /v1/project/download/
   location ~ /v1/project/download/ {
     # unfortunately, proxy settings do not support inheritance within nested locations, hence copied set up from root location
     proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
     proxy_set_header X-Forwarded-Proto $scheme;
     proxy_set_header Host $http_host;
     # we don't want nginx trying to do something clever with
     # redirects, we set the Host: header above already.
     proxy_redirect off;
     proxy_pass   http://merginmaps-server:5000;

     # disable buffering
     client_max_body_size 0; # No maximum client body size
     proxy_http_version 1.1; # Needed to disable client buffering
     proxy_request_buffering off;
     proxy_buffering off;
   }

   location ~ ^/(v1/|v2/|app/|ping|config) {
     proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
     proxy_set_header X-Forwarded-Proto $scheme;
     proxy_set_header Host $http_host;
     proxy_pass http://merginmaps-server:5000;
   }

   location /download/ {
     internal;
     alias   /data/; # we need to mount data from mergin server here
   }
 }