错误：未捕获（承诺）：错误：无法匹配任何路由。 URL 段：'executions/190'

Question

我正在尝试模拟我的后端来开发前端，我正在使用库 expressjs 来做这件事。

我有一个名为 data.json 的文件，其中包含以下对象：

"singleExecutions":[
    {"executionId":190, "label":"exe_190"},
    {"executionId":191, "label":"exe_191"}, 
    ...]

我想路由 /executions/executionId 类型的请求，以获取列表 singleExecutions 中具有我需要的特定 ID 的相应对象。

阅读expressjs的文档，看来我应该这样做：

const express = require('express');
const data = require('./data');

// 1. Create an express router.
const router = express.Router();

// 2. Handle the requests.
router.get('/executions/:executionId', (req, res) => {
  res.json(data.singleExecutions);
});

// 3. Start the server.
mockBackend.start(router); 

注意：上面的一些变量（例如mockBackend）在代码sn-p中被跳过了，但是它们没问题，因为上面没有显示的其他请求被正确路由了。

当我浏览 url /executions/190（例如）时，我得到以下异常：

ERROR Error: Uncaught (in promise): Error: Cannot match any routes. URL Segment: 'executions/190'
Error: Cannot match any routes. URL Segment: 'executions/190'
    at ApplyRedirects.noMatchError (webpack-internal:///../../../router/esm5/router.js:1848)
    at CatchSubscriber.eval [as selector] (webpack-internal:///../../../router/esm5/router.js:1813)
    at CatchSubscriber.error (webpack-internal:///../../../../rxjs/_esm5/operators/catchError.js:108)
    at MapSubscriber.Subscriber._error (webpack-internal:///../../../../rxjs/_esm5/Subscriber.js:136)
    at MapSubscriber.Subscriber.error (webpack-internal:///../../../../rxjs/_esm5/Subscriber.js:110)
    at MapSubscriber.Subscriber._error (webpack-internal:///../../../../rxjs/_esm5/Subscriber.js:136)
    at MapSubscriber.Subscriber.error (webpack-internal:///../../../../rxjs/_esm5/Subscriber.js:110)
    at MapSubscriber.Subscriber._error (webpack-internal:///../../../../rxjs/_esm5/Subscriber.js:136)
    at MapSubscriber.Subscriber.error (webpack-internal:///../../../../rxjs/_esm5/Subscriber.js:110)
    at LastSubscriber.Subscriber._error (webpack-internal:///../../../../rxjs/_esm5/Subscriber.js:136)
    at ApplyRedirects.noMatchError (webpack-internal:///../../../router/esm5/router.js:1848)
    at CatchSubscriber.eval [as selector] (webpack-internal:///../../../router/esm5/router.js:1813)
    at CatchSubscriber.error (webpack-internal:///../../../../rxjs/_esm5/operators/catchError.js:108)
    at MapSubscriber.Subscriber._error (webpack-internal:///../../../../rxjs/_esm5/Subscriber.js:136)
    at MapSubscriber.Subscriber.error (webpack-internal:///../../../../rxjs/_esm5/Subscriber.js:110)
    at MapSubscriber.Subscriber._error (webpack-internal:///../../../../rxjs/_esm5/Subscriber.js:136)
    at MapSubscriber.Subscriber.error (webpack-internal:///../../../../rxjs/_esm5/Subscriber.js:110)
    at MapSubscriber.Subscriber._error (webpack-internal:///../../../../rxjs/_esm5/Subscriber.js:136)
    at MapSubscriber.Subscriber.error (webpack-internal:///../../../../rxjs/_esm5/Subscriber.js:110)
    at LastSubscriber.Subscriber._error (webpack-internal:///../../../../rxjs/_esm5/Subscriber.js:136)
    at resolvePromise (webpack-internal:///../../../../zone.js/dist/zone.js:809)
    at resolvePromise (webpack-internal:///../../../../zone.js/dist/zone.js:775)
    at eval (webpack-internal:///../../../../zone.js/dist/zone.js:858)
    at ZoneDelegate.invokeTask (webpack-internal:///../../../../zone.js/dist/zone.js:421)
    at Object.onInvokeTask (webpack-internal:///../../../core/esm5/core.js:4956)
    at ZoneDelegate.invokeTask (webpack-internal:///../../../../zone.js/dist/zone.js:420)
    at Zone.runTask (webpack-internal:///../../../../zone.js/dist/zone.js:188)
    at drainMicroTaskQueue (webpack-internal:///../../../../zone.js/dist/zone.js:595)

我的router.get() 中肯定有一些错误配置，但我不明白是什么……谁能帮忙？

注意：在相同的代码中，如果我导航 GET 请求 /executions，它会被正确路由：

router.get('/executions', (req, res) => {
  res.json(data.executions);
}); 

...其余的都一样。

Answer 1

您必须区分角度路线和后端路线。对我来说，您似乎正在导航到与角度应用程序对应的主机/端口上的/executions/xxx。这个 executions 路由可能在 Angular 应用程序中不存在，因此为什么会出现错误

您需要导航到 nodejs 用于后端的主机/端口上的该路由。

假设您在 dev 中并使用 angular-cli，例如，您的 Angular 应用程序将在 localhost:4200 上，而您的后端将在 localhost:4000 上；所以你需要导航到http://localhost:4000/executions/xxx

如果您还使用 express 为 angular 应用程序提供服务，并且具有相同的主机/相同的端口，那么您需要确保在为 angular 注册路由之前在 express 中注册 /executions 路由。