">
<h4>buildHeader</h4>
<pre><a href="http://d.android.com/reference/android/support/annotation/Nullable.html?is-external=true" title="class or interface in android.support.annotation">@Nullable</a>
<a href="http://d.android.com/reference/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;buildHeader()</pre>
<div class="block">Returns an http header, or <code>null</code> if no header could be built.

 <p>Returning <code>null</code> or an empty String from this me