test.rb

#!/usr/bin/env ruby

require 'net/https'
https = Net::HTTP.new('logplex.herokai.com', 443)
https.use_ssl = true
https.verify_mode = OpenSSL::SSL::VERIFY_PEER

# use system defaults
https.cert_store = OpenSSL::X509::Store.new
https.cert_store.set_default_paths

https.verify_callback = lambda do |preverify_ok, ssl_context|
  # p [preverify_ok, ssl_context, ssl_context.error, ssl_context.error_string]
  # puts caller
  # puts
  if (!preverify_ok) || ssl_context.error != 0
    puts "SSL Verification failed -- Preverify: #{preverify_ok}, Error: #{ssl_context.error_string} (#{ssl_context.error})"
  end
  true
end

p https.request_get('/')