I've written some Rack-Middleware and now I'm trying to test it with Rspec. But all Rack-Middleware is instantiated with an 'app' argument, that represents the Rails app itself. How do you guys moc...

I have a middleware for announcing my application on the local network app using Bonjour, but it's also announcing the service when Rails is invoked from rake or through the console. I'd like to ...

Whenever sending malformed JSON against my API-only Rails 5.x application, I get an exception and Rails is returning the entire stack trace as JSON. Obviously I'd like to respond with a nicely, cus...

I have a rails 4 app with middleware located at lib/some/middleware.rb which is currently injected into the stack though an initializer like so: MyApp::Application.configure.do |config| config.mi...

I have installed rack-timeout gem and created rack_timeout.rb inside the initializers.I have set Rack::Timeout.service_timeout = 1 inside rack_timeout.rb.I want to restrict the rack-timeout to halt...

I have a Ruby on Rails 4.2 multi-tenant application where I want each tenant to use it's own session cookie and cookie options. I tried different approaches but I can't get every detail right. To...

I often hear the term 'middleware' in the context of Ruby on Rails. What exactly is it? Can you provide specific examples?

I have a Rails 4 sample project (Blog) and I have created a simple middleware called 'request_timer' in config/initializers/request_timer.rb #config/initializers/request_timer.rb class RequestTi...

I am trying to learn Middlewares and been practising how to mount it in the Rails application. I have followed the railscast So far I have implemented these steps: 1) Created a new Rails 4.2 appl...

I'm trying to write some Rack Middleware for a Rails 4.2 app that alters the response body using the gsub method. I found older examples that use a pattern like this: class MyMiddleware def initi...

For the latest version of Ruby on Rails (4 at the time of asking this question), what is the preferred way to implement code that modifies the request/response such as an authentication mechanism. ...

Recently I happened to see this word in Ruby code, use, when I was going through some code related to goliath, middleware etc. Looks like it is different from include/extend, and require. Can some...

I want to set basic authentication for ActiveAdmin, which internal devise solution doesn't apply to my case. For that I would like to be able to add middleware to the ActiveAdmin Engine before this...

I am working on a event handler to report exceptions to a remote api (similar to newrelic agent) and I can not find a way to add my middleware to the rack without doing it in the environment.rb fil...

In a Rack middleware filter, I know the call method takes an env hash variable. I'm looking through someone's Rack middleware code and I see env['HTTP_X_FORWARDED_HOST'] Can someone explain wha...

i want to try out a simple rack middleware "hello world", but i seem to get stuck. it looks like the main sytax changed, since some examples use this code: require 'rack/utils' class FooBar def...