module Middleware # Cheat and bypass Rails in development mode if the client attempts to download a static asset # that's already been downloaded. # # Also ensures that assets are not cached in development mode. Around Chrome 29, the behavior # of `must-revalidate` changed and would often not request assets that had changed. # # To use, include in your project and add the following to development.rb: # # require 'middleware/turbo_dev' # config.middleware.insert 0, Middleware::TurboDev # class TurboDev def initialize(app, settings={}) @app = app end def call(env) root = "#{GlobalSetting.relative_url_root}/assets/" is_asset = env['REQUEST_PATH'] && env['REQUEST_PATH'].starts_with?(root) # hack to bypass all middleware if serving assets, a lot faster 4.5 seconds -> 1.5 seconds if (etag = env['HTTP_IF_NONE_MATCH']) && is_asset name = env['REQUEST_PATH'][(root.length)..-1] etag = etag.gsub "\"", "" asset = Rails.application.assets.find_asset(name) if asset && asset.digest == etag return [304,{},[]] end end status, headers, response = @app.call(env) headers['Cache-Control'] = 'no-cache' if is_asset [status, headers, response] end end end