openssl.rb

#!/usr/bin/ruby
require 'net/http'
require 'net/https'
require 'openssl'
require 'uri'

endpoint = URI.parse("...")

request = Net::HTTP::Post.new(endpoint.path)
https = Net::HTTP.new(endpoint.host, endpoint.port)
https.use_ssl = true
https.cert = OpenSSL::X509::Certificate.new(File.read("<path>/soap.crt"))
https.key = OpenSSL::PKey::RSA.new(File.read("<path>/soap.key"))
https.verify_mode = OpenSSL::SSL::VERIFY_PEER
https.ca_file = "<path>/chain.crt"

puts https.start { |cx| cx.request(request) }