mime.types

types {
    text/html                             html htm shtml;
    text/css                              css;
    text/xml                              xml;
    image/gif                             gif;
    image/jpeg                            jpeg jpg;
    application/x-javascript              js;
    application/atom+xml                  atom;
    application/rss+xml                   rss;

    text/mathml                           mml;
    text/plain                            txt;
    text/vnd.sun.j2me.app-descriptor      jad;
    text/vnd.wap.wml                      wml;
    text/x-component                      htc;

    image/png                             png;
    image/tiff                            tif tiff;
    image/vnd.wap.wbmp                    wbmp;
    image/x-icon                          ico;
    image/x-jng                           jng;
    image/x-ms-bmp                        bmp;
    image/svg+xml                         svg;

    application/java-archive              jar war ear;
    application/mac-binhex40              hqx;
    application/msword                    doc;
    application/pdf                       pdf;
    application/postscript                ps eps ai;
    application/rtf                       rtf;
    application/vnd.ms-excel              xls;
    application/vnd.ms-powerpoint         ppt;
    application/vnd.wap.wmlc              wmlc;
    application/vnd.wap.xhtml+xml         xhtml;
    application/vnd.google-earth.kml+xml  kml;
    application/vnd.google-earth.kmz      kmz;
    application/x-cocoa                   cco;
    application/x-java-archive-diff       jardiff;
    application/x-java-jnlp-file          jnlp;
    application/x-makeself                run;
    application/x-perl                    pl pm;
    application/x-pilot                   prc pdb;
    application/x-rar-compressed          rar;
    application/x-redhat-package-manager  rpm;
    application/x-sea                     sea;
    application/x-shockwave-flash         swf;
    application/x-stuffit                 sit;
    application/x-tcl                     tcl tk;
    application/x-x509-ca-cert            der pem crt;
    application/x-xpinstall               xpi;
    application/zip                       zip;

    application/octet-stream              bin exe dll;
    application/octet-stream              deb;
    application/octet-stream              dmg;
    application/octet-stream              eot;
    application/octet-stream              iso img;
    application/octet-stream              msi msp msm;

    audio/midi                            mid midi kar;
    audio/mpeg                            mp3;
    audio/x-realaudio                     ra;

    video/3gpp                            3gpp 3gp;
    video/mpeg                            mpeg mpg;
    video/quicktime                       mov;
    video/x-flv                           flv;
    video/x-mng                           mng;
    video/x-ms-asf                        asx asf;
    video/x-ms-wmv                        wmv;
    video/x-msvideo                       avi;
}

nginx.rb

#!/usr/bin/env ruby
require "optparse"
require "erb"
require "ftools"

# Put in script directory under the rails root. Run for instant nginx proxy server.
module Script
  class Nginx
    TEMP_NGINX_CONF_PATH = "tmp/nginx.conf"
    ORIG_MIME_TYPES_PATH = "/opt/local/etc/nginx/mime.types"
    TEMP_MIME_TYPES_PATH = "tmp/mime.types"
    def initialize
      @host = "0.0.0.0"
      @port = 3000

      parse_nginx_options
      parse_rails_options
      copy_mime_types
      load_temp_config unless @config
    end

    def run
      puts "=> Booting nginx"
      `nginx -p . -c #@config`
      puts "\e[0;33m=> nginx\e[0m proxy running on: \e[0;33mhttp://#@host:#@port\e[0m"
      at_exit do
        `nginx -p . -c #@config -s stop`
        File.delete @config if temp_config?
      end
      puts "\e[0;36m=> rails\e[0m app running on:   \e[0;36mhttp://#@app_host:#@app_port\e[0m"
      %x{unicorn_rails -o#{@app_host} -p#{@app_port}}
    end

    private

    def parse_nginx_options
      ARGV.options do |opts|
        opts.banner = "Usage: #$0 [options] -- [script/server options]"

        opts.on("-P", "--nginx-port=port",
          "Runs nginx on the specified port.", "Default: #@port",
          String) { |port| @port = port }

        opts.on("-B", "--nginx-binding=ip",
          "Binds nginx to the specified ip.", "Default: #@host",
          String) { |host| @host = host }

        opts.on("-C", "--nginx-config=file",
          "Use custom nginx configuration file",
          String) { |config| @config = config }

        opts.on("-h", "--help",
          "Show this help message.") { puts opts; exit }

        begin
          opts.parse!
        rescue OptionParser::ParseError => e
          warn e
          puts opts
          exit 1
        end
      end
    end

    def parse_rails_options
      @app_host = @host
      @app_port = @port + 1

      ARGV.clone.options do |opts|
        opts.on("-p", "--port=port")  { |port| @app_port = port }
        opts.on("-b", "--binding=ip") { |host| @app_host = host }
        opts.parse!
      end
    end

    def copy_mime_types
      File.copy ORIG_MIME_TYPES_PATH, "tmp" if File.exists?(ORIG_MIME_TYPES_PATH) && !File.exists?(TEMP_MIME_TYPES_PATH)
    end

    def load_temp_config
      File.open TEMP_NGINX_CONF_PATH, "w" do |file|
        file.write ERB.new(DATA.read).result(binding)
        @config = file.path
      end
    end

    def temp_config?
      @config == TEMP_NGINX_CONF_PATH
    end
  end
end

Script::Nginx.new.run

__END__
pid tmp/pids/nginx.pid;
error_log log/nginx.error.log;

worker_processes 1;

events {
  worker_connections 1024;
  accept_mutex off;
  use kqueue;
}

http {
  include mime.types;
  
  default_type appliction/octet-stream;
  
  access_log log/nginx.access.log combined;
  
  sendfile on;
  
  tcp_nopush on;
  tcp_nodelay off;

  client_body_temp_path tmp/nginx.client_body_temp;
  fastcgi_temp_path tmp/nginx.fastcgi_temp;
  proxy_temp_path tmp/nginx.proxy_temp;

  gzip on;
  gzip_http_version 1.0;
  gzip_proxied any;
  gzip_min_length 500;
  gzip_disable "MSIE [1-6]\.";
  # text/html is auto-gzipped
  gzip_types text/plain text/xml text/css
             text/comma-separated-values
             text/javascript application/x-javascript
             application/atom+xml;
  
  upstream proxy {
    server <%= @app_host %>:<%= @app_port %> fail_timeout=0;
  }

  server {
    listen <%= @port %> default;

    client_max_body_size 4G;
    server_name <%= @host %>;

    keepalive_timeout 5;

    root ../public;


    location / {
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

      proxy_set_header Host $http_host;

      proxy_redirect off;
      
      root public;
      index index.html;

      if (!-f $request_filename) {
        proxy_pass http://proxy;
        break;
      }
    }
    # Rails error pages
    error_page 404 /404.html;
    error_page 422 /422.html;
    error_page 500 502 503 504 /500.html;

    location = /404.html {
      root /path/to/app/current/public;
    }
    location = /422.html {
      root /path/to/app/current/public;
    }
    location = /500.html {
      root /path/to/app/current/public;
    }
  }
}