multiplex

Multiplex

Multiplex gently monkey-patches TCPSocket to bind a Net::HTTP request to a non-default local IP address.

If you are craving cURL's --interface option to fire HTTP requests over multiple local IPs and are looking for a native Ruby solution, this is what you need.

Usage

Say the IP of your default interface is 10.1.1.2 and you have a second interface bound to 10.1.1.3.

require 'multiplex'
uri = URI.parse('http://jsonip.com')

Net::HTTP.bind 10.1.1.3 do
  res = Net::HTTP.get_response(uri)
  puts JSON.parse(res.body)['ip'] # 10.1.1.3
end

res = Net::HTTP.get_response(uri)
puts JSON.parse(res.body)['ip'] # 10.1.1.2

Alternatively, you can bind without a block and then unbind manually:

Net::HTTP.bind 10.1.1.3

res = Net::HTTP.get_response(uri)
puts JSON.parse(res.body)['ip'] # 10.1.1.3

Net::HTTP.unbind

res = Net::HTTP.get_response(uri)
puts JSON.parse(res.body)['ip'] # 10.1.1.2