s.html" title="annotation in retrofit.http"><code>@Headers</code></a> method annotation. For per-request control over a header
 annotate a parameter with <a href="../retrofit/client/Header.html" title="class in retrofit.client"><code>@Header</code></a>.
 <p>
 For example:
 <pre>
 public interface MyApi {
   &#64;POST("/category/{cat}") // Asynchronous execution.
   void categoryList(@Path("cat") String a, @Query("page") int b,
                     Callback&lt;List&lt;Item&gt;&gt; cb);
   &#64;POST("/categor