discourse/config/nginx.sample.conf

# Additional MIME types that you'd like nginx to handle go in here
types {
    text/csv csv;
}

upstream discourse {
  server unix:/var/www/discourse/tmp/sockets/thin.0.sock;
  server unix:/var/www/discourse/tmp/sockets/thin.1.sock;
  server unix:/var/www/discourse/tmp/sockets/thin.2.sock;
  server unix:/var/www/discourse/tmp/sockets/thin.3.sock;
}

proxy_cache_path /var/nginx/cache keys_zone=one:10m max_size=200m;

# If you are going to use Puma, use these:
#
# upstream discourse {
#   server unix:/var/www/discourse/tmp/sockets/puma.sock;
# }


# attempt to preserve the proto, must be in http context
map $http_x_forwarded_proto $thescheme {
  default $scheme;
  https https;
}

server {

  listen 80;
  gzip on;
  gzip_vary on;
  gzip_min_length 1000;
  gzip_comp_level 5;
  gzip_types application/json text/css application/x-javascript application/javascript;

  # Uncomment and configure this section for HTTPS support
  # NOTE: Put your ssl cert in your main nginx config directory (/etc/nginx)
  #
  # rewrite ^/(.*) https://enter.your.web.hostname.here/$1 permanent;
  #
  # listen 443 ssl;
  # ssl_certificate your-hostname-cert.pem;
  # ssl_certificate_key your-hostname-cert.key;
  # ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
  # ssl_ciphers HIGH:!aNULL:!MD5;
  #

  server_name enter.your.web.hostname.here;
  server_tokens off;

  sendfile on;

  keepalive_timeout 65;

  # maximum file upload size (keep up to date when changing the corresponding site setting)
  client_max_body_size 3m;

  # path to discourse's public directory
  set $public /var/www/discourse/public;

  # Prevent Internet Explorer 10 "compatibility mode", which breaks Discourse.
  # If other subdomains under your domain are supposed to use Internet Explorer Compatibility mode,
  # it may be used for this one too, unless you explicitly tell IE not to use it.  Alternatively,
  # some people have reported having compatibility mode "stuck" on for some reason.
  # (This will also prevent compatibility mode in IE 8 and 9, but those browsers aren't supported anyway.
  add_header X-UA-Compatible "IE=edge";

  # without weak etags we get zero benefit from etags on dynamically compressed content
  # further more etags are based on the file in nginx not sha of data
  # use dates, it solves the problem fine even cross server
  etag off;
  
  # prevent direct download of backups
  location ^~ /backups/ {
    internal;
  }

  location / {
    root $public;
    add_header ETag "";

    location ~* \.(eot|ttf|woff|ico)$ {
      expires 1y;
      add_header Cache-Control public;
      add_header Access-Control-Allow-Origin *;
     }

    location ~ ^/assets/ {
      expires 1y;
      # asset pipeline enables this
      gzip_static on;
      add_header Cache-Control public;
      # TODO I don't think this break is needed, it just breaks out of rewrite
      break;
    }

    location ~ ^/plugins/ {
      expires 1y;
      add_header Cache-Control public;
    }

    # cache emojis
    location ~ /_?emoji/ {
      expires 1y;
      add_header Cache-Control public;
    }

    location ~ ^/uploads/ {

      # NOTE: it is really annoying that we can't just define headers
      # at the top level and inherit.
      #
      # proxy_set_header DOES NOT inherit, by design, we must repeat it,
      # otherwise headers are not set correctly
#
      proxy_set_header Host $http_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 $thescheme;
      proxy_set_header X-Sendfile-Type X-Accel-Redirect;
      proxy_set_header X-Accel-Mapping $public/=/downloads/;
      expires 1y;
      add_header Cache-Control public;

      ## optional upload anti-hotlinking rules
      #valid_referers none blocked mysite.com *.mysite.com;
      #if ($invalid_referer) { return 403; }

      # custom CSS
      location ~ /stylesheet-cache/ {
          try_files $uri =404;
      }
      # this allows us to bypass rails
      location ~* \.(gif|png|jpg|jpeg|bmp|tif|tiff)$ {
          try_files $uri =404;
      }
      # thumbnails & optimized images
      location ~ /_optimized/ {
          try_files $uri =404;
      }

      proxy_pass http://discourse;
      break;
    }

    location ~ ^/admin/backups/ {
      proxy_set_header Host $http_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 $thescheme;
      proxy_set_header X-Sendfile-Type X-Accel-Redirect;
      proxy_set_header X-Accel-Mapping $public/=/downloads/;
      proxy_pass http://discourse;
      break;
    }

    # This big block is needed so we can selectively enable
    # acceleration for backups and avatars
    # see note about repetition above
    location ~ ^/(letter_avatar|user_avatar) {
      proxy_set_header Host $http_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 $thescheme;
      # note x-accel-redirect can not be used with proxy_cache
      proxy_cache one;
      proxy_cache_valid any 1m;
      proxy_cache_valid 200 301 302 7d;
      proxy_pass http://discourse;
      break;
    }

    # this means every file in public is tried first
    try_files $uri @discourse;
  }

  location /downloads/ {
    internal;
    alias $public/;
  }

  location @discourse {
    proxy_set_header Host $http_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 $thescheme;
    proxy_pass http://discourse;
  }

}