async asNodeStream() {
            if (checkEnvironment_js_1.isNodeLike) {
                return (0, sendRequest_js_1.sendRequest)(method, url, pipeline, Object.assign(Object.assign({}, options), { allowInsecureConnection, responseAsStream: true }), httpClient);
            }
            else {
                throw new Error("`isNodeStream` is not supported in the browser environment. Use `asBrowserStream` to obtain the response body stream.");
            }
        }
Get value of a header in the part descriptor ignoring case