Custom proxy cache server for assets speedup in *development* environment.

assets-nginx.conf

# Custom proxy cache server for assets speedup in *development* environment.
#
# Usage:
# Foreground (for tests):
# nginx -c $(pwd)/assets-nginx.conf -g 'daemon off; error_log stderr;'
#
# Background:
# nginx -c $(pwd)/assets-nginx.conf
# nginx -c $(pwd)/assets-nginx.conf -s <SIGNAL>
# signals: stop, quit, reopen, reload
#
# Cache cleanup:
# rm -rf /tmp/assets-nginx-cache
#
# Rails configuration:
# BEWARE: Configuration assumes thas that "rails server" runs at port 3000.
#
# To use this server it is required to configure app to use assets proxy:
# config.action_controller.asset_host = "http://<CUSTOM>.assets.vcap.me:3030"
# Everything before assets.vcap.me is custom cache key.
# Example url: "http://#{Rails.env}.assets.vcap.me:3030"
#
# Install:
# brew install nginx
# wget https://gist.githubusercontent.com/kml/741b75f6de6be445e92a/raw/assets-nginx.conf
#
# How it works:
# vcap.me and its subdomains resolves to 127.0.0.1
# $ ping -c 1 assets.vcap.me
# PING assets.vcap.me (127.0.0.1): 56 data bytes
#
# This config tells NGINX to listen on port 3030 on assets.vcap.me
# and subdomains of it (vhosts).
#
# Airplane mode:
# $ ping -c 1 assets.vcap.me
# ping: cannot resolve assets.vcap.me: Unknown host
#
# If not using many custom keys simplest solution may be adding *each*
# used subdomain to /etc/hosts (there is no support for wildcards).
# ...
# 127.0.0.1 <CUSTOM1>.assets.vcap.me
# 127.0.0.1 <CUSTOMN>.assets.vcap.me
# ...
# If many subdomains are in use it may be usefull to install
# local DNS server (for example dnsmasq).
#
# Source: https://gist.github.com/kml/741b75f6de6be445e92a

worker_processes 2;
#error_log /dev/null crit;
error_log /tmp/assets-nginx-error.log;
pid /tmp/assets-nginx.pid;

events {
}

http {
  proxy_cache_path /tmp/assets-nginx-cache levels=1:2 keys_zone=my_cache:10m max_size=100m inactive=1d use_temp_path=off;

  server {
    listen 127.0.0.1:3030 default_server;
    server_name _;
    return 444;
  }

  server {
    listen 127.0.0.1:3030;
    server_name .assets.vcap.me;
    #access_log off;
    #access_log /dev/stdout;
    access_log /tmp/assets-nginx-access.log;
    sendfile on;
    server_tokens off;

    location / {
      return 200 "Hello Assets!";
    }

    location /ping {
      return 200 "pong";
    }

    location /assets {
      proxy_pass_header Server;
      add_header Server "Ninja-Server";

      add_header Access-Control-Allow-Origin *;
      add_header X-Cache-Status $upstream_cache_status;

      proxy_cache my_cache;
      proxy_cache_key $host$scheme$proxy_host$request_uri;
      proxy_cache_lock on;
      proxy_cache_use_stale error timeout invalid_header updating http_500 http_502 http_503 http_504 http_403 http_404;
      proxy_cache_valid 500 502 1s;
      proxy_cache_valid any 1d;

      proxy_ignore_headers Cache-Control;
      proxy_set_header Accept-Encoding "";

      proxy_pass http://127.0.0.1:3000;
    }
  }
}