nginx.conf

# Sample nginx config to run a server on localhost:9000 that proxies to an
# haproxy on localhost:9001.  This is a heavily simplified version of what we
# run.
#
# Run with nginx -c nginx.conf -p ./

# Run a single worker process as that is sufficent to saturate our backend
worker_processes 1;

worker_rlimit_nofile 1048576;

pid logs/nginx.pid;

events {
  worker_connections 768;
}

# settings necessary to run unprivileged in foreground
daemon off;
error_log logs/error.log;

http {
  client_max_body_size 5M;

  # settings necessary to run unprivileged in foreground
  proxy_temp_path tmp/proxy;
  client_body_temp_path tmp/body;
  fastcgi_temp_path tmp/fastcgi;
  uwsgi_temp_path tmp/uwsgi;
  scgi_temp_path tmp/scgi;
  access_log logs/access.log;
  error_log logs/error.log;

  proxy_read_timeout 600s;

  sendfile on;
  tcp_nopush on;
  tcp_nodelay on;
  keepalive_timeout 65;
  server_tokens off;

  include /etc/nginx/mime.types;
  default_type application/octet-stream;

  gzip on;
  gzip_disable "msie6";

  # relevant part of config

  upstream example_app {
    # our app listens on port 9001
    server 127.0.0.1:9001 fail_timeout=0;
  }

  server {
    # nginx listens on 9000
    listen 9000 default_server;

    # size of buffer for request body before spilling to disk.
    # We've set this high as our renderer process large requests.
    client_body_buffer_size 1m;

    # absolute limit for client body size, analogous to body-parser's limit
    client_max_body_size 5m;

    # Response headers buffer size
    proxy_buffer_size 8k;
    # Response body buffers (1m)
    proxy_buffers 8 128k;

    # default route
    location / {
      proxy_http_version 1.1;
      proxy_set_header Connection "";
      proxy_set_header Host $http_host;
      proxy_set_header X-Forwarded-Proto $scheme;
      proxy_redirect off;
      proxy_pass http://example_app;
    }

    # special case for /health that proxies request with smaller buffers
    location = /health {
      proxy_http_version 1.1;
      proxy_set_header Connection "";
      proxy_set_header Host $http_host;
      proxy_set_header X-Forwarded-Proto $scheme;

      # set smaller buffers for /health
      client_body_buffer_size 8k;
      proxy_buffers 8 8k;
      proxy_redirect off;
      proxy_pass http://example_app;
    }

    # offload /ping connectivity check so that it never hits the node app
    location = /ping {
      return 200 'PONG
';
    }
  }
}