Response.text() 承诺什么时候会拒绝？

Question

我看到MDN/Response/text.text()文档上显示了仅使用的示例then

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

它返回一个用字符串解析的承诺。

由于 lint 规则，我需要放置

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

当我需要捕获被拒绝的承诺时，是否有用例Response.text()？也许一些例子？

Answer 1

如果响应已经consumed/读取，那么它可能会失败/拒绝，也就是说，如果上面已经调用了 .text/.json 等内容。

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

例子：

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