Parallel Requests¶ ↑

Some adapters support running requests in parallel. This can be achieved using the in_parallel method on the connection object.

# Install the Typhoeus adapter with `gem install faraday-typhoeus` first.
require 'faraday/typhoeus'

conn = Faraday.new('http://httpbingo.org') do |faraday|
  faraday.adapter :typhoeus
end

now = Time.now

conn.in_parallel do
  conn.get('/delay/3')
  conn.get('/delay/3')
end

# This should take about 3 seconds, not 6.
puts "Time taken: #{Time.now - now}"

A note on Async¶ ↑

You might have heard about Async and its native integration with Ruby 3.0. The good news is that you can already use Async with Faraday (thanks to the async-http-faraday gem) and this does not require the use of in_parallel to run parallel requests. Instead, you only need to wrap your Faraday code into an Async block:

# Install the Async adapter with `gem install async-http-faraday` first.
require 'async/http/faraday'

conn = Faraday.new('http://httpbingo.org') do |faraday|
  faraday.adapter :async_http
end

now = Time.now

# NOTE: This is not limited to a single connection anymore!
# You can run parallel requests spanning multiple connections.
Async do
  Async { conn.get('/delay/3') }
  Async { conn.get('/delay/3') }
end

# This should take about 3 seconds, not 6.
puts "Time taken: #{Time.now - now}"

The big advantage of using Async is that you can now run parallel requests spanning multiple connections, whereas the in_parallel method only works for requests that are made through the same connection.