Rails talk via XML API

How can I create request from Ruby on Rails application to XML API with such conditions:

1) Header:

Message-ID: 1
Message-Request: Request
Time: Time.current

2) Blank string between header and XML-body

3) XML-body:

<?xml version="1.0" encoding="Windows-1251" standalone="yes" ?>
  <Message Action="Get info" Global_Type="ABC" Unit_ID="1" User_ID="1">
    <ID_Code>123456789</ID_Code>
    <Include>Holder</Include> 
  </Message>

I want to know about best practices (create template for requests etc.), which HttpClient I should use for it (rest-client, faraday etc.) and how t o build it.