content_type_proxy.ru

use Rack::ShowExceptions
use Rack::CommonLogger

require 'rack/request'
require 'rack/response'
require 'open-uri'

class HeaderProxy
  def call(env)
    req = Rack::Request.new(env)

    Rack::Response.new.finish do |res|
      url = req.path[1..-1]
      type = req.params['type'] || 'text/html'

      begin
        file = open(url).read;
        
        # Special case for gists
        if url.include?('gist.github.com')
          raw_url = file.match(/\/raw[^"]+/);
          url = 'http://gist.github.com'+raw_url[0];
          file = open(url).read
        end

        res.write file
        res.headers['ContentType'] = type;

      rescue OpenURI::HTTPError => e
        res.write "Error opening: #{url}\n"
        res.write e.inspect
      end
    end
  end
end


run HeaderProxy.new