当 Response.text() promise 会被拒绝？

Question

我看到 MDN/Response/text 文档显示了仅将 .text() 与 then

一起使用的示例

response.text().then(function (text) {
  // do something with the text response
});

It returns a promise that resolves with a String.

因为lint规则，我需要把

// eslint-disable-next-line @typescript-eslint/no-floating-promises
res.text().then(async (t) => {

是否有我需要捕捉来自 Response.text() 的拒绝承诺的用例？也许有一些例子？

Answer 1

如果响应已经 consumed/读取，它可以 fail/reject，也就是说，如果已经调用了 .text/.json 等等。

查看 polyfill 实现 (https://github.com/github/fetch/blob/d1d09fb8039b4b8c7f2f5d6c844ea72d8a3cefe6/fetch.js#L301 ) 不过我没有看到其他可能的情况。

示例：

response.text()
  .then(t1 => {
    console.log({ t1 }); // after calling text() we can see the result here
    return response; // but we decided to return the response to the next handler
  })
  .then(res =>res.text()) // here we try to read text() again
  .then(t2 => console.log({ t2 })) // and expecting text to be logged here
  .catch(er => console.log({ er })); // but the text() promise rejects with 
  // TypeError: Failed to execute 'text' on 'Response': body stream already read

当 Response.text() promise 会被拒绝？

When Response.text() promise will reject?

javascript

promise

fetch-api