title: Android Retrofit Parameterized @Headers
body: <p>I am using OAuth and I need to put the OAuth token in my header every time I make a request. I see the <code>@Header</code> annotation, but is there a way to make it parameterized so i can pass in at run time? </p>
  
  <p>Here is the concept</p>
  
  <p><code>@Header({Authorization:'OAuth {var}', api_version={var} })</code></p>
  
  <p>Can you pass them in at Runtime?</p>
  
  <pre><code>@GET("/users")
  void getUsers(
      @Header("Authorization") String auth, 
      @Header("X-Api-Version") String version, 
      Callback&lt;User&gt; callback
  )
  </code></pre>