  return response.request().newBuilder()
        .header("Proxy-Authorization", credential)
        .build();
 </code></pre>

 <p>The proxy authenticator may implement preemptive authentication, reactive authentication, or
 both.

 <p>Applications may configure OkHttp with an authenticator for origin servers, or proxy servers,
 or both.</div>
</li>
</ul>
</div>
<div class="summary">
<ul class="blockList">
<li class="blockList">
<!-- =========== FIELD SUMMARY =========== -->
<ul class="blockList">
<li class=