React-native将同步GET api调用转换为异步GET

Question

我正在尝试在我的代码中进行同步api调用，并且本机不允许这样做。我尝试异步使用fetch，但我收到'网络请求失败'错误。这是我想要转换的代码：

var adfsUrl = null;
try {
let response = await fetch(url + '/XrmServices/2011/Organization.svc?wsdl=wsdl0',
{
    method: 'GET',
    headers: {
        'Connection': 'Keep-Alive',
        'Accept': 'application/json',
        'Content-Type': 'application/soap+xml; charset=UTF-8',
    },
});
let responseJson = await response.json();
    adfsUrl = $(responseJson).find('ms-xrm\\:Identifier');
    return $(adfsUrl[0]).text().replace("http://", "https://");
} catch(error) {
    console.error(error);
}

我失败的尝试代码：

/**
     * Flatten a multi-dimensional associative array with dots.
     *
     * @param  array   $array
     * @param  string  $prepend
     * @return array
     */
    public static function dot($array, $prepend = '')
    {
        $results = [];

        foreach ($array as $key => $value) {
            if (is_array($value) && ! empty($value)) {
                $results = array_merge($results, static::dot($value, $prepend.$key.'.'));
            } else {
                $results[$prepend.$key] = $value;
            }
        }

        return $results;
    }