Microsoft Edge中来自Stream的新响应 [英] New Response from Stream in Microsoft Edge

问题描述

有人知道如何创建新的回复来自Microsoft Edge中的 ReadableStream ？

Does someone know of a way to create a new Response from a ReadableStream in Microsoft Edge?

对于Chrome，这非常简单。您可以只取一个 ReadableStream 并将其作为第一个参数传递给 Response 的构造函数。这样，您可以创建一个新的响应，并说明来自网络响应的另一个状态代码，而不复制响应：

For Chrome, this is quite simple. You can just take a ReadableStream and pass it in the constructor of Response as the first argument. This way you can, for example, create a new Response with say another status code from a network response, without copying the response:

fetch('https://www.baqend.com/')
  .then(res => new Response(res.body, { status: 222 }))
  .then(it => it.text())
  .then(it => console.log('Text prefix ' + it.substr(0,16)))
  .catch(it => console.log('error: ' + it))

虽然这在Chrome中完美运行，但Edge不支持 ReadableStream 作为 Response 构造函数的输入。我在Edge中使用它的唯一方法是首先获得文本响应（有效地复制响应并阻止流）：

While this works perfectly in Chrome, Edge does not support ReadableStream as input for the Response constructor. The only way I get it to work in Edge is when I get the text response first (effectively copying the response and blocking the stream):

fetch('https://www.baqend.com/')
  .then(it => it.text())
  .then(text => new Response(text, { status: 222 }))
  .then(it => it.text())
  .then(it => console.log('Text prefix ' + it.substr(0,16)))
  .catch(it => console.log('error: ' + it))

有没有人知道从Edge中的可读流创建新响应的方法？

PS：我是使用Microsoft Edge 42.17115.1.0（最新的开发人员预览，因为我正在测试服务工作者）

PS: I am using Microsoft Edge 42.17115.1.0 (latest developer preview, since I am testing Service Workers)

PPS：第一个代码在firefox中不起作用，因为firefox不支持获取来自 Response.body 的 RedableStream 。 Edge确实公开 Response.body 但是。

PPS: The first code does not work in firefox either because firefox does not support getting a RedableStream from Response.body. Edge does expose Response.body though.

推荐答案

试试这个：

https：// www。 npmjs.com/package/web-streams-polyfill

var streams = require("web-streams-polyfill");
var readable = new streams.ReadableStream;

// Or, in ES6

import { ReadableStream } from "web-streams-polyfill";

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