The Rack::Static middleware intercepts requests for static files (javascript files, images, stylesheets, etc) based on the url prefixes passed in the options, and serves them using a Rack::File object. This allows a Rack stack to serve both static and dynamic content.
Examples:
use Rack::Static, :urls => ["/media"] will serve all requests beginning with %rmedia from the "media" folder located in the current directory (ie media/*). use Rack::Static, :urls => ["/css", "/images"], :root => "public" will serve all requests beginning with %rcss or /mages from the folder "public" in the current directory (ie public/css/* and public/images/*)
# File lib/rack/static.rb, line 19 def initialize(app, options={}) @app = app @urls = options[:urls] || ["/favicon.ico"] root = options[:root] || Dir.pwd @file_server = Rack::File.new(root) end
# File lib/rack/static.rb, line 26 def call(env) path = env["PATH_INFO"] can_serve = @urls.any? { |url| path.index(url) == 0 } if can_serve @file_server.call(env) else @app.call(env) end end