rack-middleware

I've used Heroku tutorial to implement websockets. It works properly with Thin, but does not work with Unicorn and Puma. Also there's an echo message implemented, which responds to client's message. It works properly on each server, so there are no problems with websockets implementation. Redis setup is also correct (it catches all messages, and executes the code inside subscribe block). How does it work now: On server start, an empty @clients array is initialized. Then new Thread is started, which is listening to Redis and which is intended to send that message to corresponding user from

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 initialize(app) @app = app end def call(env) status, headers, response = @app.call(env) # do some stuff [status, headers, response] end end What I'm finding is that there is no setter method for response.body . Is there another pattern I can start with to go about modifying the body? The problem was that it expects an Array for the 3rd argument in the call method. This pattern got me working again. # not