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`redirect_to :back` is a somewhat common pattern in Rails apps, but it is not completely safe. There are a number of circumstances where HTTP referrer information is not available on the request. This happens often with bot traffic and occasionally to user traffic depending on browser security settings. When there is no referrer available on the request, `redirect_to :back` will raise `ActionController::RedirectBackError`, usually resulting in an application error. `redirect_back` takes a required `fallback_location` keyword argument that specifies the redirect when the referrer information is not available. This prevents 500 errors caused by `ActionController::RedirectBackError`. |
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| README.rdoc | ||
= Action Pack -- From request to response Action Pack is a framework for handling and responding to web requests. It provides mechanisms for *routing* (mapping request URLs to actions), defining *controllers* that implement actions, and generating responses by rendering *views*, which are templates of various formats. In short, Action Pack provides the view and controller layers in the MVC paradigm. It consists of several modules: * Action Dispatch, which parses information about the web request, handles routing as defined by the user, and does advanced processing related to HTTP such as MIME-type negotiation, decoding parameters in POST, PATCH, or PUT bodies, handling HTTP caching logic, cookies and sessions. * Action Controller, which provides a base controller class that can be subclassed to implement filters and actions to handle requests. The result of an action is typically content generated from views. With the Ruby on Rails framework, users only directly interface with the Action Controller module. Necessary Action Dispatch functionality is activated by default and Action View rendering is implicitly triggered by Action Controller. However, these modules are designed to function on their own and can be used outside of Rails. == Download and installation The latest version of Action Pack can be installed with RubyGems: $ gem install actionpack Source code can be downloaded as part of the Rails project on GitHub * https://github.com/rails/rails/tree/master/actionpack == License Action Pack is released under the MIT license: * http://www.opensource.org/licenses/MIT == Support API documentation is at * http://api.rubyonrails.org Bug reports can be filed for the Ruby on Rails project here: * https://github.com/rails/rails/issues Feature requests should be discussed on the rails-core mailing list here: * https://groups.google.com/forum/?fromgroups#!forum/rubyonrails-core