class="returntype">String</span>
                  </span>
              </dt>
              <dd>
                  Retrieve all the response headers from a request.
              </dd>
              <dt id="getResponseHeader" class="callable">
                  <a href="polymer_app_layout/HttpRequest/getResponseHeader.html"><span class="name ">getResponseHeader</span></a><span class="signature">(<wbr><span class="parameter" id="getResponseHeader-param-header"><span class="type-annotation">String</span> <sp