UnhandledPromiseRejectionWarning：未处理的承诺拒绝-API

Question

我正在尝试从API中提取数据，但是添加更新后却退出失败，原因是：\ "2020-01-01T00: 00: 00-0300 \"

没有此参数，则返回数组，但没有我想要的数据

index.js

require('es6-promise').polyfill();
require('isomorphic-fetch');

fetch('https://www.bluesight.io/graphql', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json',
               'Bluesight-API-Token': 'api-token-here'},
    body: JSON.stringify({"query": "{squads {name cards(includedOnKanban: true, closed: false, archived: false, cancelled: false, updatedSince: \"2020-01-01T00:00:00-0300\") {identifier title description status priority assignees { fullname email } secondaryLabel primaryLabels}}}"}),})           

.then(function(response) {

    if (response.status >= 400) {

        return Promise.reject('Oops!').catch(err => {
            throw new Error(err);
          });

    }else{

        console.log("Method: POST\nContent-Type: application/json\nBluesight-API-Token: OK\nQuery: OK");
        response.json();

    }

    return response.text();
})

.then(response => console.log(response.data));

输出

PS C:\Users\Documents\Bluesight> node .\index.js
(node:12444) UnhandledPromiseRejectionWarning: Error: Oops!
    at C:\Users\Documents\Bluesight\index.js:15:19
(node:12444) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 3)
(node:12444) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
PS C:\Users\Documents\Bluesight> node .\index.js
(node:20236) UnhandledPromiseRejectionWarning: Error: Oops!
    at C:\Users\Documents\Bluesight\index.js:15:19
    at processTicksAndRejections (internal/process/task_queues.js:97:5)
(node:20236) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 3)
(node:20236) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

POSTMAN

Answer 1

node：12444）UnhandledPromiseRejectionWarning：未处理的承诺 拒绝。该错误是由抛出异步内部引起的 没有捕获块或拒绝承诺 未使用.catch（）处理。 上面的错误清楚地表明，当您抛出错误时，您应该处理承诺拒绝

状态码为400或以上时

Promise.reject('Oops!').catch(err => {
            throw new Error(err);
          })

被执行。上面的代码将拒绝应在承诺链中处理的承诺。因此，在promise链中添加如下所示的catch不会引发错误

.then(response => console.log(response.data)).catch((err)=>{
   //handle error here
 })

要更好地理解它，请检查此REPL https://repl.it/@sandeepp2016/HugeAvariciousLearning 首先执行它，然后删除注释，然后再次执行，您会看到区别

此外，您使用的这段代码有语法错误，请更正。

JSON.stringify({"query": "{squads {name cards(includedOnKanban: true, closed: false, archived: false, cancelled: false, updatedSince: \"2020-01-01T00:00:00-0300\") {identifier title description status priority assignees { fullname email } secondaryLabel primaryLabels}}}"})   

我又创建了一个Repl签出。替换实际的API密钥，然后它应该可以工作了：

https://repl.it/@sandeepp2016/TrainedFinancialLaboratory