eter" id="getString-param-withCredentials"><span class="type-annotation">bool</span> <span class="parameter-name">withCredentials</span></span>, <span class="parameter" id="getString-param-onProgress"><span class="type-annotation">void</span> <span class="parameter-name">onProgress</span>(<span class="parameter" id="onProgress-param-e"><span class="type-annotation"><a href="polymer_app_layout/ProgressEvent-class.html">ProgressEvent</a></span> <span class="parameter-name">e</span></span>)</span>})
          