Function fetch

packages/core/fetch/index.mjs:457–528

(input, init)

}

    function fetch(input, init) {
        return new Promise(function (resolve, reject) {
            var request = new Request(input, init);

            if (request.signal && request.signal.aborted) {
                return reject(new exports.DOMException("Aborted", "AbortError"));
            }

            var xhr = new XMLHttpRequest();

            function abortXhr() {
                xhr.abort();
            }

            xhr.onload = function () {
                var options = {
                    status: xhr.status,
                    statusText: xhr.statusText,
                    headers: parseHeaders(xhr.getAllResponseHeaders() || "")
                };
                options.url =
                    "responseURL" in xhr
                        ? xhr.responseURL
                        : options.headers.get("X-Request-URL");
                var body = "response" in xhr ? xhr.response : xhr.responseText;
                resolve(new Response(body, options));
            };

            xhr.onerror = function () {
                reject(new TypeError("Network request failed"));
            };

            xhr.ontimeout = function () {
                reject(new TypeError("Network request failed"));
            };

            xhr.onabort = function () {
                reject(new exports.DOMException("Aborted", "AbortError"));
            };

            xhr.open(request.method, request.url, true);

            if (request.credentials === "include") {
                xhr.withCredentials = true;
            } else if (request.credentials === "omit") {
                xhr.withCredentials = false;
            }

            if ("responseType" in xhr && support.blob) {
                xhr.responseType = "blob";
            }

            request.headers.forEach(function (value, name) {
                xhr.setRequestHeader(name, value);
            });

            if (request.signal) {
                request.signal.addEventListener("abort", abortXhr);