title: Spring - how to pass automatically http header between microservices
body: <p>I'm having multiple microservices</p>
  
  <pre><code>1. MangerApp 
  2. ProcessApp
  3. DoingStuffApp
  4. .....
  </code></pre>
  
  <p>the "MangerApp Microservices" get an <code>Http-Request</code> 
  I'm looking for a way to transfer automatically some of the <code>HTTP headers</code>
  in the call, while I don't want to go over each place and do - add Headers, my <code>HTTP</code> headers are stored as a <strong>thread-local Map</strong>.</p>
  
  <p>since I call to other <code>microservices</code>, with <code>RestTemplate</code> I have many different calls some <code>get/post/put/etc...</code>
  changing each one them and passing the header manually is not that efficient.
  I'm looking for a way to manage it, other than extending the <code>RestTemplate Class</code> now.</p>