Faraday Em::Http adapter

This gem is a Faraday adapter for the Em::Http::Request library. Faraday is an HTTP client library that provides a common interface over many adapters. Every adapter is defined into its own gem. This gem defines the adapter for Em::Http::Request.


Add these lines to your application's Gemfile:

gem 'faraday-em_http'

And then execute:

$ bundle install

Or install them yourself as:

$ gem install faraday-em_http


This adapter can be used to make parallel requests using EventMachine.

The major difference between this and Faraday Em::Synchrony adapter is that it does not use fibers.

Error handling and responses have a slightly different behaviour and structure in some cases. Please run thorough testing scenarios, including connection failures and SSL failures

Base request

require 'faraday/em_http'

conn = Faraday.new(...) do |f|
  # no custom options available
  f.adapter :em_http

Parallel Requests

require 'faraday/em_http'

urls = Array.new(5) { '' }

conn = Faraday::Connection.new do |builder|
  builder.adapter :em_http

  conn.in_parallel do
    puts "Parallel manager: #{conn.parallel_manager}"

    @responses = urls.map do |url|

# Gather responses outside of block
puts @responses.map(&:status).join(', ')
puts @responses.map(&:status).compact.count


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

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.


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

Code of Conduct

Everyone interacting in the Faraday Em::Http adapter project's codebase, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.