export async function getResponseError(r: Response): Promise<string> {
    let ct = r.headers.get("Content-Type");
    if (ct && ct.indexOf("json") > -1) {
        const json = await r.json();
        if (json.error) {
            return json.error;
        }
    }
    const html = await r.text();
    if (html) {
        const doc = new DOMParser().parseFromString(html, "text/html");
        return doc.documentElement.textContent ?? "";
    } else {
        return r.statusText;
    }
}