I have a ruby script which instruments Net::HTTP requests in Rails applications. This works as follows: When Ruby loads the Net::HTTP class, I alias the request method. At every http request, my instrumented method gets executed. So that this works, I need to execute my script BEFORE ruby loads the standard library and BEFORE Rails gets loaded. So I need the earliest possible point in Rails where I can require my instrumentation script. I tried the following locations: - config/preinitializer.rb -> too late because Net::HTTP got already loaded - config/application.rb -> also too late for the same reason - I put my instrumentation script at the top of the Gemfile. So that my Gemfile looks like this: require "myinstrumentationscript" source 'https://rubygems.org' # Bundle edge Rails instead: gem 'rails', github: 'rails/rails' gem 'rails', '4.1.1' # Use sqlite3 as the database for Active Record gem 'sqlite3' # Use SCSS for stylesheets gem 'sass-rails', '~> 4.0.3' # Use Uglifier as compressor for JavaScript assets gem 'uglifier', '>= 1.3.0' # Use CoffeeScript for .js.coffee assets and views gem 'coffee-rails', '~> 4.0.0' This solution works not bad, but has some drawbacks: - When I do "bundle install" or "bundle update" my script gets executed. But I want my script only run before Rails gets initialized. - The bigger problem: This solution seems only to work in Rails 4. I get at least a Gemfile error in Rails 2. So I need another location where I can load my instrumentation script. Any help is very appreciated. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/5d88b212-c057-41c5-9807-6d1255233668%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.