[whatwg/fetch] the body.getReader() size/length (Issue #1425)

if i use json() text()
havesize  !=headers['content-length'];

```javascrpt
 let response = await fetch(request),havesize=0;
for (const [key, value] of response.headers.entries()) {
        headers[key] = value;

    }
    const reader = response.body.getReader();
    const stream = new ReadableStream({
        start(controller) {
            let push = e => {
                reader.read().then(({done,value}) => {
                    if (done) {
                        controller.close();
                        push = null;
                        return;
                    }
                    havesize += value.length;
                    let statussize = '0%';
                    if(headers['content-length'])statussize = Math.floor(havesize / Number(headers['content-cength']) * 100) + '%';  
                    controller.enqueue(value);
                    push();
                });
            }
            push();
        }
    });

```

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