span class="inline-flex"><div><span><span>fn</span></span></div></span></div><div><div class="title"><div data-togglable="Parameters"><p class="paragraph">the callback function which receives the request parameter in JSON as input and return the response JSON and status.When <code class="lang-kotlin">fn</code> return <code class="lang-kotlin">Pair(Response,Status)</code> the webview will receive the response and status . When <code class="lang-kotlin">fn</code> returns <code class="lang-kotlin">String</code