function fetch$7(url, opts) {

	// allow custom promise
	if (!fetch$7.Promise) {
		throw new Error('native promise missing, set fetch.Promise to your favorite alternative');
	}

	Body$6.Promise = fetch$7.Promise;

	// wrap http.request into fetch
	return new fetch$7.Promise(function (resolve, reject) {
		// build request object
		const request = new Request$6(url, opts);
		const options = getNodeRequestOptions$6(request);

		const send = (options.protocol === 'https:' ? https$3 : http$6).request;
		const signal = request.signal;

		let response = null;

		const abort = function abort() {
			let error = new AbortError$7('The user aborted a request.');
			reject(error);
			if (request.body && request.body instanceof Stream$2.Readable) {
				destroyStream$5(request.body, error);
			}
			if (!response || !response.body) return;
			response.body.emit('error', error);
		};

		if (signal && signal.aborted) {
			abort();
			return;
		}

		const abortAndFinalize = function abortAndFinalize() {
			abort();
			finalize();
		};

		// send request
		const req = send(options);
		let reqTimeout;

		if (signal) {
			signal.addEventListener('abort', abortAndFinalize);
		}

		function finalize() {
			req.abort();
			if (signal) signal.removeEventListener('abort', abortAndFinalize);
			clearTimeout(reqTimeout);
		}

		if (request.timeout) {
			req.once('socket', function (socket) {
				reqTimeout = setTimeout(function () {
					reject(new FetchError$6(`network timeout at: ${request.url}`, 'request-timeout'));
					finalize();
				}, request.timeout);
			});
		}

		req.on('error', function (err) {
			reject(new FetchError$6(`request to ${request.url} failed, reason: ${err.message}`, 'system', err));

			if (response && response.body) {
				destroyStream$5(response.body, err);
			}

			finalize();
		});

		fixResponseChunkedTransferBadEnding$6(req, function (err) {
			if (signal && signal.aborted) {
				return;
			}

			if (response && response.body) {
				destroyStream$5(response.body, err);
			}
		});

		/* c8 ignore next 18 */
		if (parseInt(process.version.substring(1)) < 14) {
			// Before Node.js 14, pipeline() does not fully support async iterators and does not always
			// properly handle when the socket close/end events are out of order.
			req.on('socket', function (s) {
				s.addListener('close', function (hadError) {
					// if a data listener is still present we didn't end cleanly
					const hasDataListener = s.listenerCount('data') > 0;

					// if end happened before close but the socket didn't emit an error, do it now
					if (response && hasDataListener && !hadError && !(signal && signal.aborted)) {
						const err = new Error('Premature close');
						err.code = 'ERR_STREAM_PREMATURE_CLOSE';
						response.body.emit('error', err);
					}
				});
			});
		}

		req.on('response', function (res) {
			clearTimeout(reqTimeout);

			const headers = createHeadersLenient$5(res.headers);

			// HTTP fetch step 5
			if (fetch$7.isRedirect(res.statusCode)) {
				// HTTP fetch step 5.2
				const location = headers.get('Location');

				// HTTP fetch step 5.3
				let locationURL = null;
				try {
					locationURL = location === null ? null : new URL$1$6(location, request.url).toString();
				} catch (err) {
					// error here can only be invalid URL in Location: header
					// do not throw when options.redirect == manual
					// let the user extract the errorneous redirect URL
					if (request.redirect !== 'manual') {
						reject(new FetchError$6(`uri requested responds with an invalid redirect URL: ${location}`, 'invalid-redirect'));
						finalize();
						return;
					}
				}

				// HTTP fetch step 5.5
				switch (request.redirect) {
					case 'error':
						reject(new FetchError$6(`uri requested responds with a redirect, redirect mode is set to error: ${request.url}`, 'no-redirect'));
						finalize();
						return;
					case 'manual':
						// node-fetch-specific step: make manual redirect a bit easier to use by setting the Location header value to the resolved URL.
						if (locationURL !== null) {
							// handle corrupted header
							try {
								headers.set('Location', locationURL);
							} catch (err) {
								// istanbul ignore next: nodejs server prevent invalid response headers, we can't test this through normal request
								reject(err);
							}
						}
						break;
					case 'follow':
						// HTTP-redirect fetch step 2
						if (locationURL === null) {
							break;
						}

						// HTTP-redirect fetch step 5
						if (request.counter >= request.follow) {
							reject(new FetchError$6(`maximum redirect reached at: ${request.url}`, 'max-redirect'));
							finalize();
							return;
						}

						// HTTP-redirect fetch step 6 (counter increment)
						// Create a new Request object.
						const requestOpts = {
							headers: new Headers$6(request.headers),
							follow: request.follow,
							counter: request.counter + 1,
							agent: request.agent,
							compress: request.compress,
							method: request.method,
							body: request.body,
							signal: request.signal,
							timeout: request.timeout,
							size: request.size
						};

						if (!isDomainOrSubdomain$6(request.url, locationURL) || !isSameProtocol$6(request.url, locationURL)) {
							for (const name of ['authorization', 'www-authenticate', 'cookie', 'cookie2']) {
								requestOpts.headers.delete(name);
							}
						}

						// HTTP-redirect fetch step 9
						if (res.statusCode !== 303 && request.body && getTotalBytes$6(request) === null) {
							reject(new FetchError$6('Cannot follow redirect with body being a readable stream', 'unsupported-redirect'));
							finalize();
							return;
						}

						// HTTP-redirect fetch step 11
						if (res.statusCode === 303 || (res.statusCode === 301 || res.statusCode === 302) && request.method === 'POST') {
							requestOpts.method = 'GET';
							requestOpts.body = undefined;
							requestOpts.headers.delete('content-length');
						}

						// HTTP-redirect fetch step 15
						resolve(fetch$7(new Request$6(locationURL, requestOpts)));
						finalize();
						return;
				}
			}

			// prepare response
			res.once('end', function () {
				if (signal) signal.removeEventListener('abort', abortAndFinalize);
			});
			let body = res.pipe(new PassThrough$1$5());

			const response_options = {
				url: request.url,
				status: res.statusCode,
				statusText: res.statusMessage,
				headers: headers,
				size: request.size,
				timeout: request.timeout,
				counter: request.counter
			};

			// HTTP-network fetch step 12.1.1.3
			const codings = headers.get('Content-Encoding');

			// HTTP-network fetch step 12.1.1.4: handle content codings

			// in following scenarios we ignore compression support
			// 1. compression support is disabled
			// 2. HEAD request
			// 3. no Content-Encoding header
			// 4. no content response (204)
			// 5. content not modified response (304)
			if (!request.compress || request.method === 'HEAD' || codings === null || res.statusCode === 204 || res.statusCode === 304) {
				response = new Response$6(body, response_options);
				resolve(response);
				return;
			}

			// For Node v6+
			// Be less strict when decoding compressed responses, since sometimes
			// servers send slightly invalid responses that are still accepted
			// by common browsers.
			// Always using Z_SYNC_FLUSH is what cURL does.
			const zlibOptions = {
				flush: zlib$2.Z_SYNC_FLUSH,
				finishFlush: zlib$2.Z_SYNC_FLUSH
			};

			// for gzip
			if (codings == 'gzip' || codings == 'x-gzip') {
				body = body.pipe(zlib$2.createGunzip(zlibOptions));
				response = new Response$6(body, response_options);
				resolve(response);
				return;
			}

			// for deflate
			if (codings == 'deflate' || codings == 'x-deflate') {
				// handle the infamous raw deflate response from old servers
				// a hack for old IIS and Apache servers
				const raw = res.pipe(new PassThrough$1$5());
				raw.once('data', function (chunk) {
					// see http://stackoverflow.com/questions/37519828
					if ((chunk[0] & 0x0F) === 0x08) {
						body = body.pipe(zlib$2.createInflate());
					} else {
						body = body.pipe(zlib$2.createInflateRaw());
					}
					response = new Response$6(body, response_options);
					resolve(response);
				});
				raw.on('end', function () {
					// some old IIS servers return zero-length OK deflate responses, so 'data' is never emitted.
					if (!response) {
						response = new Response$6(body, response_options);
						resolve(response);
					}
				});
				return;
			}

			// for br
			if (codings == 'br' && typeof zlib$2.createBrotliDecompress === 'function') {
				body = body.pipe(zlib$2.createBrotliDecompress());
				response = new Response$6(body, response_options);
				resolve(response);
				return;
			}

			// otherwise, use response as-is
			response = new Response$6(body, response_options);
			resolve(response);
		});

		writeToStream$6(req, request);
	});
}
Fetch function

@param   Mixed    url   Absolute url or Request instance
@param   Object   opts  Fetch options
@return  Promise