title: How to define a generic responce header parameter in RAML
body: <p>I need to define a response header parameter that would be common for all the 2xx response codes in the RAML API.</p>
  
  <p>I only found a way to define the parameter per each HTTP code like this:</p>
  
  <pre><code> responses:
    200:
     headers:
      X-Transaction-Id:
        type: string
  </code></pre>
  
  <p>But I need to do something like this:</p>
  
  <pre><code> responses:
        [200-300):
         headers:
          X-Transaction-Id:
            type: string
  </code></pre>
  
  <p>Any help pls?</p>