title: Error 401 from retrofit even after setting the Authorization Token
body: <p>Trying to access an api with <code>@POST</code> and I already set my <code>@Header("Authorization") String TOKEN</code>.</p>
  
  <p>I've tried it with <code>@GET</code> and it worked, but I'm passing a some form fields so I need to use <code>@POST</code></p>
  
  <pre><code>@POST("details")
  @FormUrlEncoded
  Call&lt;Play&gt; playTrack(
          @Header("Authorization") String TOKEN,
          @Field("event_id") int event_id,
          @Field("longitude") double longitude,
          @Field("latitude") double latitude    
  );
  </code></pre>