external=true" title="class or interface in java.lang">String</a>&nbsp;getAuthenticationScheme&#8203;()</pre>
<div class="block">Returns the string value of the authentication scheme used to protect
 the resource. If the resource is not authenticated, null is returned.

 Values are the same as the CGI variable AUTH_TYPE</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>one of the static members BASIC_AUTH, FORM_AUTH,
         CLIENT_CERT_AUTH, DIGEST_AUTH (suitable for == comparison) or the
