Rack::Cascade tries an request on several apps, and returns the first response that is not 404 (or in a list of configurable status codes).
# File lib/rack/cascade.rb, line 11 def initialize(apps, catch=404) @apps = []; @has_app = {} apps.each { |app| add app } @catch = {} [*catch].each { |status| @catch[status] = true } end
# File lib/rack/cascade.rb, line 30 def add app @has_app[app] = true @apps << app end
# File lib/rack/cascade.rb, line 19 def call(env) result = NotFound @apps.each do |app| result = app.call(env) break unless @catch.include?(result[0].to_i) end result end
# File lib/rack/cascade.rb, line 35 def include? app @has_app.include? app end