使用 ReadableStream 作为请求正文进行获取

问题描述

我正在尝试将 fetch 与 ReadableStream.在这个例子中，ReadableStream 应该简单地重复一些数据...".

I'm trying to use fetch with a ReadableStream. In this example, the ReadableStream should simply repeat "Some data..." indefinitely.

fetch('/', {
  method: 'POST',
  body: new ReadableStream({
    pull: function(controller) {
      console.log('pull called!');
      controller.enqueue('Some data...');
    }
  })
});

这不起作用.pull 执行一次时，请求正文中不会发送任何数据.

This doesn't work. While pull is executed once, no data is sent in the request body.

POST / HTTP/1.1
Host: example.com
Connection: keep-alive
Content-Length: 0
Origin: https://example.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36
Accept: */*
Referer: https://example.com/
Accept-Encoding: gzip, deflate, br
Accept-Language: en-US,en;q=0.8

如何使 ReadableStream(或任何可以写入动态数据的流)可用于 fetch?

How can I make a ReadableStream (or any kind of stream where I can write dynamic data) usable with fetch?

或者，如果这还不可能，您能否指出这一点?谢谢.

Alternatively, if this isn't yet possible, could you please indicate this? Thank you.

注意:这是一个更具体的衍生问题:通过HTTP将数据从浏览器流式传输到服务器的方法

推荐答案

我们正在努力完成这项工作，请参阅 https://github.com/whatwg/fetch/pull/425 获取 Fetch 标准的 PR.完成后，您可以期望它(缓慢地)进入浏览器.

We're working on making this work, see https://github.com/whatwg/fetch/pull/425 for the PR to the Fetch Standard. Once that is done you can expect this to make its way into browsers (slowly).

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