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= XSendFile The XSendFile plugin provides a simple interface for sending files via the X-Sendfile HTTP header. This enables your web server to serve the file directly from disk, instead of streaming it through your Rails process. This is faster and saves a lot of memory if you're using Mongrel. Not every web server supports this header. YMMV. The interface is as close as possible to Rails' ActionController::Streaming#send_file method. == Installation First, you need to install the plugin. From the root of your Rails app run: ruby script/plugin install http://john.guen.in/svn/plugins/x_send_file === Set up your web server If you have not already installed/enabled/configured X-Sendfile support for your web server, now's the time. * Apache users should look into mod_xsendfile http://celebnamer.celebworld.ws/stuff/mod_xsendfile * Lighttpd users may need to configure mod_fastcgi or mod_proxy_core (depending on your version). http://blog.lighttpd.net/articles/2006/07/02/x-sendfile http://blog.lighttpd.net/articles/2006/07/22/mod_proxy_core-got-x-sendfile-support * If you are using something else, I'm sure you're smart enough to figure it out :) == Usage The x_send_file method takes the same options as Rails' send_file method. x_send_file('/path/to/file') x_send_file('/path/to/image.jpg', :type => 'image/jpeg', :disposition => 'inline') It also has a few new options. You can overwrite the HTTP header it uses (the default is 'X-Sendfile'). x_send_file('/path/to/file/', :header => 'X-LIGHTTPD-SEND-FILE') == Configuration You can easily set any of the options you would pass to the method, as global defaults for the plugin. This is particularly useful if your server requires a HTTP header other than 'X-Sendfile' and you like to keep your code DRY. Just place the following in your environment.rb. XSendFile::Plugin.options[:header] = 'X-LIGHTTPD-SEND-FILE' Though you probably won't need to, you can change the default for any other option the same way: XSendFile::Plugin.options[:disposition] = 'inline' Now, if you're feeling really adventurous, you can have x_send_file take over any time send_file is called. XSendFile::Plugin.replace_send_file! This is a little scary, but it lends itself nicely to neat tricks like: XSendFile::Plugin.replace_send_file! unless ENV['RAILS_ENV'] = 'development' == Warning Never, *never* do anything remotely like this: x_send_file(params[:path]) Most X-Sendfile configurations allow the web server to send any file it can read. Sanitize the path before sending or j00 = h4x0r3d!