ignature">(<wbr><span class="parameter" id="open-param-method"><span class="type-annotation">String</span> <span class="parameter-name">method</span></span>, <span class="parameter" id="open-param-url"><span class="type-annotation">String</span> <span class="parameter-name">url</span></span>, {<span class="parameter" id="open-param-async"><span class="type-annotation">bool</span> <span class="parameter-name">async</span></span>, <span class="parameter" id="open-param-user"><span class="type-annotation">Stri