worker_processes 2;
error_log /var/logs/nginx/mydomain.error.log;
pid /var/run/nginx.pid;
include /usr/share/nginx/modules/*.conf; # See /usr/share/doc/nginx/README.dynamic.

events {
  worker_connections 1024; ## Default: 1024
  use epoll; # http://nginx.org/en/docs/events.html
  multi_accept on; # http://nginx.org/en/docs/ngx_core_module.html#multi_accept
}

# Core Modules Docs:
# http://nginx.org/en/docs/http/ngx_http_core_module.html
http {
  include '/etc/nginx/mime.types';
  default_type application/octet-stream;

  keepalive_timeout 65;
  keepalive_requests 100000;
  tcp_nopush on;
  tcp_nodelay on;



  # Nginx `listener` block
  server {
    listen [::]:80 default_server;
    listen 80;

    gzip on;
    gzip_types text/css application/javascript application/json image/svg+xml;
    gzip_comp_level 9;
    etag on;

    # Content-Security-Policy: test in Report-Only mode first and watch the
    # browser console for violations before switching the header name to the
    # enforcing Content-Security-Policy. Note: nginx add_header does not merge
    # into a location that sets its own add_header - if you promote this to an
    # active header, re-declare it inside every location block that already
    # uses add_header (the /pacs/ proxy here does) or it will silently not
    # apply there.
    # add_header Content-Security-Policy-Report-Only "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://cdnjs.cloudflare.com; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob:; font-src 'self' data:; connect-src 'self' https: blob:; worker-src 'self' blob:; object-src 'self' blob:; frame-src 'self' blob:; frame-ancestors 'none'; base-uri 'self'; form-action 'self'" always;


    # Reverse Proxy for `orthanc` APIs (including DICOMWeb)
    #
    location /pacs/ {

      proxy_http_version 1.1;

      proxy_set_header Host $host;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header X-Forwarded-Proto $scheme;

      expires 0;
      add_header Cache-Control private;

      # CORS: this recipe serves the viewer from this same nginx, so browser
      # requests to /pacs/ are same-origin and need NO CORS header at all.
      # If you host the viewer on a different origin, allow that origin
      # explicitly and only that origin - never use '*' on an endpoint that
      # serves PHI. Example:
      # add_header 'Access-Control-Allow-Origin' 'https://viewer.example.com' always;

      proxy_pass http://orthanc:8042/;
    }


    # Do not cache sw.js, required for offline-first updates.
    location /sw.js {
      add_header Cache-Control "no-cache";
      proxy_cache_bypass $http_pragma;
      proxy_cache_revalidate on;
      expires off;
      access_log off;
    }


    # Single Page App
    # Try files, fallback to index.html
    #
    location / {
      root /var/www/html;
      index index.html;
      try_files $uri $uri/ /index.html;
      add_header Cache-Control "no-store, no-cache, must-revalidate";
    }

  }
}