ServerTimingMiddleware

This is a simple Rack Middleware that can be plugged in apps which use ActiveSupport::Notifications such as Rails apps, to retrieve all the events and send them as a header so they can be seen in Server Timing compliant clients, such as Chrome's Network > Timing.

⚠️ Take into account this has not been tested in production. It might have memory leaks or slow down your application.

This is how it looks in Chrome's inspector:

Add this line to your application's Gemfile:

gem 'server_timing_middleware'

And then execute:

$ bundle

Or install it yourself as:

$ gem install server_timing_middleware

Plug in to your app's Middleware chain.

In Rails, that could be in config/application.rb with something like

config.middleware.use Rack::ServerTimingMiddleware

After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/javierhonduco/server_timing_middleware. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

The gem is available as open source under the terms of the MIT License.