feat(adapter): add fetch adapter; (#6371)

lib/adapters/adapters.js

@@ -1,11 +1,13 @@
 import utils from '../utils.js';
 import httpAdapter from './http.js';
 import xhrAdapter from './xhr.js';
+import fetchAdapter from './fetch.js';
 import AxiosError from "../core/AxiosError.js";
 
 const knownAdapters = {
   http: httpAdapter,
-  xhr: xhrAdapter
+  xhr: xhrAdapter,
+  fetch: fetchAdapter
 }
 
 utils.forEach(knownAdapters, (fn, value) => {

lib/adapters/fetch.js

@@ -0,0 +1,197 @@
+import platform from "../platform/index.js";
+import utils from "../utils.js";
+import AxiosError from "../core/AxiosError.js";
+import composeSignals from "../helpers/composeSignals.js";
+import {trackStream} from "../helpers/trackStream.js";
+import AxiosHeaders from "../core/AxiosHeaders.js";
+import progressEventReducer from "../helpers/progressEventReducer.js";
+import resolveConfig from "../helpers/resolveConfig.js";
+import settle from "../core/settle.js";
+
+const fetchProgressDecorator = (total, fn) => {
+  const lengthComputable = total != null;
+  return (loaded) => setTimeout(() => fn({
+    lengthComputable,
+    total,
+    loaded
+  }));
+}
+
+const isFetchSupported = typeof fetch !== 'undefined';
+
+const supportsRequestStreams = isFetchSupported && (() => {
+  let duplexAccessed = false;
+
+  const hasContentType = new Request(platform.origin, {
+    body: new ReadableStream(),
+    method: 'POST',
+    get duplex() {
+      duplexAccessed = true;
+      return 'half';
+    },
+  }).headers.has('Content-Type');
+
+  return duplexAccessed && !hasContentType;
+})();
+
+const DEFAULT_CHUNK_SIZE = 64 * 1024;
+
+const resolvers = {
+  stream: (res) => res.body
+};
+
+isFetchSupported && ['text', 'arrayBuffer', 'blob', 'formData'].forEach(type => [
+  resolvers[type] = utils.isFunction(Response.prototype[type]) ? (res) => res[type]() : (_, config) => {
+    throw new AxiosError(`Response type ${type} is not supported`, AxiosError.ERR_NOT_SUPPORT, config);
+  }
+])
+
+const getBodyLength = async (body) => {
+  if(utils.isBlob(body)) {
+    return body.size;
+  }
+
+  if(utils.isSpecCompliantForm(body)) {
+    return (await new Request(body).arrayBuffer()).byteLength;
+  }
+
+  if(utils.isArrayBufferView(body)) {
+    return body.byteLength;
+  }
+
+  if(utils.isURLSearchParams(body)) {
+    body = body + '';
+  }
+
+  if(utils.isString(body)) {
+    return (await new TextEncoder().encode(body)).byteLength;
+  }
+}
+
+const resolveBodyLength = async (headers, body) => {
+  const length = utils.toFiniteNumber(headers.getContentLength());
+
+  return length == null ? getBodyLength(body) : length;
+}
+
+export default async (config) => {
+  let {
+    url,
+    method,
+    data,
+    signal,
+    cancelToken,
+    timeout,
+    onDownloadProgress,
+    onUploadProgress,
+    responseType,
+    headers,
+    withCredentials = 'same-origin',
+    fetchOptions
+  } = resolveConfig(config);
+
+  responseType = responseType ? (responseType + '').toLowerCase() : 'text';
+
+  let [composedSignal, stopTimeout] = (signal || cancelToken || timeout) ?
+    composeSignals([signal, cancelToken], timeout) : [];
+
+  let finished, request;
+
+  const onFinish = () => {
+    !finished && setTimeout(() => {
+      composedSignal && composedSignal.unsubscribe();
+    });
+
+    finished = true;
+  }
+
+  try {
+    if (onUploadProgress && supportsRequestStreams && method !== 'get' && method !== 'head') {
+      let requestContentLength = await resolveBodyLength(headers, data);
+
+      let _request = new Request(url, {
+        method,
+        body: data,
+        duplex: "half"
+      });
+
+      let contentTypeHeader;
+
+      if (utils.isFormData(data) && (contentTypeHeader = _request.headers.get('content-type'))) {
+        headers.setContentType(contentTypeHeader)
+      }
+
+      data = trackStream(_request.body, DEFAULT_CHUNK_SIZE, fetchProgressDecorator(
+        requestContentLength,
+        progressEventReducer(onUploadProgress)
+      ));
+    }
+
+    if (!utils.isString(withCredentials)) {
+      withCredentials = withCredentials ? 'cors' : 'omit';
+    }
+
+    request = new Request(url, {
+      ...fetchOptions,
+      signal: composedSignal,
+      method,
+      headers: headers.normalize().toJSON(),
+      body: data,
+      duplex: "half",
+      withCredentials
+    });
+
+    let response = await fetch(request);
+
+    const isStreamResponse = responseType === 'stream' || responseType === 'response';
+
+    if (onDownloadProgress || isStreamResponse) {
+      const options = {};
+
+      Object.getOwnPropertyNames(response).forEach(prop => {
+        options[prop] = response[prop];
+      });
+
+      const responseContentLength = utils.toFiniteNumber(response.headers.get('content-length'));
+
+      response = new Response(
+        trackStream(response.body, DEFAULT_CHUNK_SIZE, onDownloadProgress && fetchProgressDecorator(
+          responseContentLength,
+          progressEventReducer(onDownloadProgress, true)
+        ), isStreamResponse && onFinish),
+        options
+      );
+    }
+
+    responseType = responseType || 'text';
+
+    let responseData = await resolvers[utils.findKey(resolvers, responseType) || 'text'](response, config);
+
+    !isStreamResponse && onFinish();
+
+    stopTimeout && stopTimeout();
+
+    return await new Promise((resolve, reject) => {
+      settle(resolve, reject, {
+        data: responseData,
+        headers: AxiosHeaders.from(response.headers),
+        status: response.status,
+        statusText: response.statusText,
+        config,
+        request
+      })
+    })
+  } catch (err) {
+    onFinish();
+
+    let {code} = err;
+
+    if (err.name === 'NetworkError') {
+      code = AxiosError.ERR_NETWORK;
+    }
+
+    throw AxiosError.from(err, code, config, request);
+  }
+}
+
+

lib/adapters/xhr.js

@@ -1,93 +1,39 @@
-'use strict';
-
 import utils from './../utils.js';
 import settle from './../core/settle.js';
-import cookies from './../helpers/cookies.js';
-import buildURL from './../helpers/buildURL.js';
-import buildFullPath from '../core/buildFullPath.js';
-import isURLSameOrigin from './../helpers/isURLSameOrigin.js';
 import transitionalDefaults from '../defaults/transitional.js';
 import AxiosError from '../core/AxiosError.js';
 import CanceledError from '../cancel/CanceledError.js';
 import parseProtocol from '../helpers/parseProtocol.js';
 import platform from '../platform/index.js';
 import AxiosHeaders from '../core/AxiosHeaders.js';
-import speedometer from '../helpers/speedometer.js';
-
-function progressEventReducer(listener, isDownloadStream) {
-  let bytesNotified = 0;
-  const _speedometer = speedometer(50, 250);
-
-  return e => {
-    const loaded = e.loaded;
-    const total = e.lengthComputable ? e.total : undefined;
-    const progressBytes = loaded - bytesNotified;
-    const rate = _speedometer(progressBytes);
-    const inRange = loaded <= total;
-
-    bytesNotified = loaded;
-
-    const data = {
-      loaded,
-      total,
-      progress: total ? (loaded / total) : undefined,
-      bytes: progressBytes,
-      rate: rate ? rate : undefined,
-      estimated: rate && total && inRange ? (total - loaded) / rate : undefined,
-      event: e
-    };
-
-    data[isDownloadStream ? 'download' : 'upload'] = true;
-
-    listener(data);
-  };
-}
+import progressEventReducer from '../helpers/progressEventReducer.js';
+import resolveConfig from "../helpers/resolveConfig.js";
 
 const isXHRAdapterSupported = typeof XMLHttpRequest !== 'undefined';
 
 export default isXHRAdapterSupported && function (config) {
   return new Promise(function dispatchXhrRequest(resolve, reject) {
-    let requestData = config.data;
-    const requestHeaders = AxiosHeaders.from(config.headers).normalize();
-    let {responseType, withXSRFToken} = config;
+    const _config = resolveConfig(config);
+    let requestData = _config.data;
+    const requestHeaders = AxiosHeaders.from(_config.headers).normalize();
+    let {responseType} = _config;
     let onCanceled;
     function done() {
-      if (config.cancelToken) {
-        config.cancelToken.unsubscribe(onCanceled);
+      if (_config.cancelToken) {
+        _config.cancelToken.unsubscribe(onCanceled);
       }
 
-      if (config.signal) {
-        config.signal.removeEventListener('abort', onCanceled);
-      }
-    }
-
-    let contentType;
-
-    if (utils.isFormData(requestData)) {
-      if (platform.hasStandardBrowserEnv || platform.hasStandardBrowserWebWorkerEnv) {
-        requestHeaders.setContentType(false); // Let the browser set it
-      } else if ((contentType = requestHeaders.getContentType()) !== false) {
-        // fix semicolon duplication issue for ReactNative FormData implementation
-        const [type, ...tokens] = contentType ? contentType.split(';').map(token => token.trim()).filter(Boolean) : [];
-        requestHeaders.setContentType([type || 'multipart/form-data', ...tokens].join('; '));
+      if (_config.signal) {
+        _config.signal.removeEventListener('abort', onCanceled);
       }
     }
 
     let request = new XMLHttpRequest();
 
-    // HTTP basic authentication
-    if (config.auth) {
-      const username = config.auth.username || '';
-      const password = config.auth.password ? unescape(encodeURIComponent(config.auth.password)) : '';
-      requestHeaders.set('Authorization', 'Basic ' + btoa(username + ':' + password));
-    }
-
-    const fullPath = buildFullPath(config.baseURL, config.url);
-
-    request.open(config.method.toUpperCase(), buildURL(fullPath, config.params, config.paramsSerializer), true);
+    request.open(_config.method.toUpperCase(), _config.url, true);
 
     // Set the request timeout in MS
-    request.timeout = config.timeout;
+    request.timeout = _config.timeout;
 
     function onloadend() {
       if (!request) {
@@ -149,7 +95,7 @@ export default isXHRAdapterSupported && function (config) {
         return;
       }
 
-      reject(new AxiosError('Request aborted', AxiosError.ECONNABORTED, config, request));
+      reject(new AxiosError('Request aborted', AxiosError.ECONNABORTED, _config, request));
 
       // Clean up request
       request = null;
@@ -159,7 +105,7 @@ export default isXHRAdapterSupported && function (config) {
     request.onerror = function handleError() {
       // Real errors are hidden from us by the browser
       // onerror should only fire if it's a network error
-      reject(new AxiosError('Network Error', AxiosError.ERR_NETWORK, config, request));
+      reject(new AxiosError('Network Error', AxiosError.ERR_NETWORK, _config, request));
 
       // Clean up request
       request = null;
@@ -167,37 +113,21 @@ export default isXHRAdapterSupported && function (config) {
 
     // Handle timeout
     request.ontimeout = function handleTimeout() {
-      let timeoutErrorMessage = config.timeout ? 'timeout of ' + config.timeout + 'ms exceeded' : 'timeout exceeded';
-      const transitional = config.transitional || transitionalDefaults;
-      if (config.timeoutErrorMessage) {
-        timeoutErrorMessage = config.timeoutErrorMessage;
+      let timeoutErrorMessage = _config.timeout ? 'timeout of ' + _config.timeout + 'ms exceeded' : 'timeout exceeded';
+      const transitional = _config.transitional || transitionalDefaults;
+      if (_config.timeoutErrorMessage) {
+        timeoutErrorMessage = _config.timeoutErrorMessage;
       }
       reject(new AxiosError(
         timeoutErrorMessage,
         transitional.clarifyTimeoutError ? AxiosError.ETIMEDOUT : AxiosError.ECONNABORTED,
-        config,
+        _config,
         request));
 
       // Clean up request
       request = null;
     };
 
-    // Add xsrf header
-    // This is only done if running in a standard browser environment.
-    // Specifically not if we're in a web worker, or react-native.
-    if(platform.hasStandardBrowserEnv) {
-      withXSRFToken && utils.isFunction(withXSRFToken) && (withXSRFToken = withXSRFToken(config));
-
-      if (withXSRFToken || (withXSRFToken !== false && isURLSameOrigin(fullPath))) {
-        // Add xsrf header
-        const xsrfValue = config.xsrfHeaderName && config.xsrfCookieName && cookies.read(config.xsrfCookieName);
-
-        if (xsrfValue) {
-          requestHeaders.set(config.xsrfHeaderName, xsrfValue);
-        }
-      }
-    }
-
     // Remove Content-Type if data is undefined
     requestData === undefined && requestHeaders.setContentType(null);
 
@@ -209,26 +139,26 @@ export default isXHRAdapterSupported && function (config) {
     }
 
     // Add withCredentials to request if needed
-    if (!utils.isUndefined(config.withCredentials)) {
-      request.withCredentials = !!config.withCredentials;
+    if (!utils.isUndefined(_config.withCredentials)) {
+      request.withCredentials = !!_config.withCredentials;
     }
 
     // Add responseType to request if needed
     if (responseType && responseType !== 'json') {
-      request.responseType = config.responseType;
+      request.responseType = _config.responseType;
     }
 
     // Handle progress if needed
-    if (typeof config.onDownloadProgress === 'function') {
-      request.addEventListener('progress', progressEventReducer(config.onDownloadProgress, true));
+    if (typeof _config.onDownloadProgress === 'function') {
+      request.addEventListener('progress', progressEventReducer(_config.onDownloadProgress, true));
     }
 
     // Not all browsers support upload events
-    if (typeof config.onUploadProgress === 'function' && request.upload) {
-      request.upload.addEventListener('progress', progressEventReducer(config.onUploadProgress));
+    if (typeof _config.onUploadProgress === 'function' && request.upload) {
+      request.upload.addEventListener('progress', progressEventReducer(_config.onUploadProgress));
     }
 
-    if (config.cancelToken || config.signal) {
+    if (_config.cancelToken || _config.signal) {
       // Handle cancellation
       // eslint-disable-next-line func-names
       onCanceled = cancel => {
@@ -240,13 +170,13 @@ export default isXHRAdapterSupported && function (config) {
         request = null;
       };
 
-      config.cancelToken && config.cancelToken.subscribe(onCanceled);
-      if (config.signal) {
-        config.signal.aborted ? onCanceled() : config.signal.addEventListener('abort', onCanceled);
+      _config.cancelToken && _config.cancelToken.subscribe(onCanceled);
+      if (_config.signal) {
+        _config.signal.aborted ? onCanceled() : _config.signal.addEventListener('abort', onCanceled);
       }
     }
 
-    const protocol = parseProtocol(fullPath);
+    const protocol = parseProtocol(_config.url);
 
     if (protocol && platform.protocols.indexOf(protocol) === -1) {
       reject(new AxiosError('Unsupported protocol ' + protocol + ':', AxiosError.ERR_BAD_REQUEST, config));

lib/core/AxiosHeaders.js

@@ -100,6 +100,10 @@ class AxiosHeaders {
       setHeaders(header, valueOrRewrite)
     } else if(utils.isString(header) && (header = header.trim()) && !isValidHeaderName(header)) {
       setHeaders(parseHeaders(header), valueOrRewrite);
+    } else if (utils.isHeaders(header)) {
+      for (const [key, value] of header.entries()) {
+        setHeader(value, key, rewrite);
+      }
     } else {
       header != null && setHeader(valueOrRewrite, header, rewrite);
     }

lib/defaults/index.js

@@ -37,7 +37,7 @@ const defaults = {
 
   transitional: transitionalDefaults,
 
-  adapter: ['xhr', 'http'],
+  adapter: ['xhr', 'http', 'fetch'],
 
   transformRequest: [function transformRequest(data, headers) {
     const contentType = headers.getContentType() || '';
@@ -58,7 +58,8 @@ const defaults = {
       utils.isBuffer(data) ||
       utils.isStream(data) ||
       utils.isFile(data) ||
-      utils.isBlob(data)
+      utils.isBlob(data) ||
+      utils.isReadableStream(data)
     ) {
       return data;
     }
@@ -101,6 +102,10 @@ const defaults = {
     const forcedJSONParsing = transitional && transitional.forcedJSONParsing;
     const JSONRequested = this.responseType === 'json';
 
+    if (utils.isResponse(data) || utils.isReadableStream(data)) {
+      return data;
+    }
+
     if (data && utils.isString(data) && ((forcedJSONParsing && !this.responseType) || JSONRequested)) {
       const silentJSONParsing = transitional && transitional.silentJSONParsing;
       const strictJSONParsing = !silentJSONParsing && JSONRequested;

lib/helpers/AxiosTransformStream.js

@@ -65,19 +65,20 @@ class AxiosTransformStream extends stream.Transform{
 
       process.nextTick(() => {
         self.emit('progress', {
-          'loaded': bytesTransferred,
-          'total': totalBytes,
-          'progress': totalBytes ? (bytesTransferred / totalBytes) : undefined,
-          'bytes': progressBytes,
-          'rate': rate ? rate : undefined,
-          'estimated': rate && totalBytes && bytesTransferred <= totalBytes ?
-            (totalBytes - bytesTransferred) / rate : undefined
+          loaded: bytesTransferred,
+          total: totalBytes,
+          progress: totalBytes ? (bytesTransferred / totalBytes) : undefined,
+          bytes: progressBytes,
+          rate: rate ? rate : undefined,
+          estimated: rate && totalBytes && bytesTransferred <= totalBytes ?
+            (totalBytes - bytesTransferred) / rate : undefined,
+          lengthComputable: totalBytes != null
         });
       });
     }, internals.ticksRate);
 
     const onFinish = () => {
-      internals.updateProgress(true);
+      internals.updateProgress.call(true);
     };
 
     this.once('end', onFinish);

lib/helpers/composeSignals.js

@@ -0,0 +1,46 @@
+import CanceledError from "../cancel/CanceledError.js";
+import AxiosError from "../core/AxiosError.js";
+
+const composeSignals = (signals, timeout) => {
+  let controller = new AbortController();
+
+  let aborted;
+
+  const onabort = function (cancel) {
+    if (!aborted) {
+      aborted = true;
+      unsubscribe();
+      const err = cancel instanceof Error ? cancel : this.reason;
+      controller.abort(err instanceof AxiosError ? err : new CanceledError(err instanceof Error ? err.message : err));
+    }
+  }
+
+  let timer = timeout && setTimeout(() => {
+    onabort(new AxiosError(`timeout ${timeout} of ms exceeded`, AxiosError.ETIMEDOUT))
+  }, timeout)
+
+  const unsubscribe = () => {
+    if (signals) {
+      timer && clearTimeout(timer);
+      timer = null;
+      signals.forEach(signal => {
+        signal &&
+        (signal.removeEventListener ? signal.removeEventListener('abort', onabort) : signal.unsubscribe(onabort));
+      });
+      signals = null;
+    }
+  }
+
+  signals.forEach((signal) => signal && signal.addEventListener && signal.addEventListener('abort', onabort));
+
+  const {signal} = controller;
+
+  signal.unsubscribe = unsubscribe;
+
+  return [signal, () => {
+    timer && clearTimeout(timer);
+    timer = null;
+  }];
+}
+
+export default composeSignals;

lib/helpers/progressEventReducer.js

@@ -0,0 +1,32 @@
+import speedometer from "./speedometer.js";
+import throttle from "./throttle.js";
+
+export default (listener, isDownloadStream, freq = 3) => {
+  let bytesNotified = 0;
+  const _speedometer = speedometer(50, 250);
+
+  return throttle(e => {
+    const loaded = e.loaded;
+    const total = e.lengthComputable ? e.total : undefined;
+    const progressBytes = loaded - bytesNotified;
+    const rate = _speedometer(progressBytes);
+    const inRange = loaded <= total;
+
+    bytesNotified = loaded;
+
+    const data = {
+      loaded,
+      total,
+      progress: total ? (loaded / total) : undefined,
+      bytes: progressBytes,
+      rate: rate ? rate : undefined,
+      estimated: rate && total && inRange ? (total - loaded) / rate : undefined,
+      event: e,
+      lengthComputable: total != null
+    };
+
+    data[isDownloadStream ? 'download' : 'upload'] = true;
+
+    listener(data);
+  }, freq);
+}

lib/helpers/resolveConfig.js

@@ -0,0 +1,57 @@
+import platform from "../platform/index.js";
+import utils from "../utils.js";
+import isURLSameOrigin from "./isURLSameOrigin.js";
+import cookies from "./cookies.js";
+import buildFullPath from "../core/buildFullPath.js";
+import mergeConfig from "../core/mergeConfig.js";
+import AxiosHeaders from "../core/AxiosHeaders.js";
+import buildURL from "./buildURL.js";
+
+export default (config) => {
+  const newConfig = mergeConfig({}, config);
+
+  let {data, withXSRFToken, xsrfHeaderName, xsrfCookieName, headers, auth} = newConfig;
+
+  newConfig.headers = headers = AxiosHeaders.from(headers);
+
+  newConfig.url = buildURL(buildFullPath(newConfig.baseURL, newConfig.url), config.params, config.paramsSerializer);
+
+  // HTTP basic authentication
+  if (auth) {
+    headers.set('Authorization', 'Basic ' +
+      btoa((auth.username || '') + ':' + (auth.password ? unescape(encodeURIComponent(auth.password)) : ''))
+    );
+  }
+
+  let contentType;
+
+  if (utils.isFormData(data)) {
+    if (platform.hasStandardBrowserEnv || platform.hasStandardBrowserWebWorkerEnv) {
+      headers.setContentType(undefined); // Let the browser set it
+    } else if ((contentType = headers.getContentType()) !== false) {
+      // fix semicolon duplication issue for ReactNative FormData implementation
+      const [type, ...tokens] = contentType ? contentType.split(';').map(token => token.trim()).filter(Boolean) : [];
+      headers.setContentType([type || 'multipart/form-data', ...tokens].join('; '));
+    }
+  }
+
+  // Add xsrf header
+  // This is only done if running in a standard browser environment.
+  // Specifically not if we're in a web worker, or react-native.
+
+  if (platform.hasStandardBrowserEnv) {
+    withXSRFToken && utils.isFunction(withXSRFToken) && (withXSRFToken = withXSRFToken(newConfig));
+
+    if (withXSRFToken || (withXSRFToken !== false && isURLSameOrigin(newConfig.url))) {
+      // Add xsrf header
+      const xsrfValue = xsrfHeaderName && xsrfCookieName && cookies.read(xsrfCookieName);
+
+      if (xsrfValue) {
+        headers.set(xsrfHeaderName, xsrfValue);
+      }
+    }
+  }
+
+  return newConfig;
+}
+

lib/helpers/throttle.js

@@ -10,7 +10,9 @@ function throttle(fn, freq) {
   let timestamp = 0;
   const threshold = 1000 / freq;
   let timer = null;
-  return function throttled(force, args) {
+  return function throttled() {
+    const force = this === true;
+
     const now = Date.now();
     if (force || now - timestamp > threshold) {
       if (timer) {
@@ -18,13 +20,13 @@ function throttle(fn, freq) {
         timer = null;
       }
       timestamp = now;
-      return fn.apply(null, args);
+      return fn.apply(null, arguments);
     }
     if (!timer) {
       timer = setTimeout(() => {
         timer = null;
         timestamp = Date.now();
-        return fn.apply(null, args);
+        return fn.apply(null, arguments);
       }, threshold - (now - timestamp));
     }
   };

lib/helpers/trackStream.js

@@ -0,0 +1,56 @@
+
+export const streamChunk = function* (chunk, chunkSize) {
+  let len = chunk.byteLength;
+
+  if (!chunkSize || len < chunkSize) {
+    yield chunk;
+    return;
+  }
+
+  let pos = 0;
+  let end;
+
+  while (pos < len) {
+    end = pos + chunkSize;
+    yield chunk.slice(pos, end);
+    pos = end;
+  }
+}
+
+const encoder = new TextEncoder();
+
+export const readBytes = async function* (iterable, chunkSize) {
+  for await (const chunk of iterable) {
+    yield* streamChunk(ArrayBuffer.isView(chunk) ? chunk : (await encoder.encode(String(chunk))), chunkSize);
+  }
+}
+
+export const trackStream = (stream, chunkSize, onProgress, onFinish) => {
+  const iterator = readBytes(stream, chunkSize);
+
+  let bytes = 0;
+
+  return new ReadableStream({
+    type: 'bytes',
+
+    async pull(controller) {
+      const {done, value} = await iterator.next();
+
+      if (done) {
+        controller.close();
+        onFinish();
+        return;
+      }
+
+      let len = value.byteLength;
+      onProgress && onProgress(bytes += len);
+      controller.enqueue(new Uint8Array(value));
+    },
+    cancel(reason) {
+      onFinish(reason);
+      return iterator.return();
+    }
+  }, {
+    highWaterMark: 2
+  })
+}

lib/platform/common/utils.js

@@ -40,8 +40,11 @@ const hasStandardBrowserWebWorkerEnv = (() => {
   );
 })();
 
+const origin = hasBrowserEnv && window.location.href || 'http://localhost';
+
 export {
   hasBrowserEnv,
   hasStandardBrowserWebWorkerEnv,
-  hasStandardBrowserEnv
+  hasStandardBrowserEnv,
+  origin
 }

lib/utils.js

@@ -209,6 +209,8 @@ const isFormData = (thing) => {
  */
 const isURLSearchParams = kindOfTest('URLSearchParams');
 
+const [isReadableStream, isRequest, isResponse, isHeaders] = ['ReadableStream', 'Request', 'Response', 'Headers'].map(kindOfTest);
+
 /**
  * Trim excess whitespace off the beginning and end of a string
  *
@@ -597,8 +599,7 @@ const toObjectSet = (arrayOrString, delimiter) => {
 const noop = () => {}
 
 const toFiniteNumber = (value, defaultValue) => {
-  value = +value;
-  return Number.isFinite(value) ? value : defaultValue;
+  return value != null && Number.isFinite(value = +value) ? value : defaultValue;
 }
 
 const ALPHA = 'abcdefghijklmnopqrstuvwxyz'
@@ -679,6 +680,10 @@ export default {
   isBoolean,
   isObject,
   isPlainObject,
+  isReadableStream,
+  isRequest,
+  isResponse,
+  isHeaders,
   isUndefined,
   isDate,
   isFile,