在 Node.js 中运行 MOCK API 服务器时，收到错误消息 CANNOT GET /

Question

我在运行 MOCK API 服务器时收到“CANNOT GET/”错误消息，通过我的浏览器 (http://localhost:3000) 使用以下 index.js 文件打开端口 3000 上的本地主机。当我执行npm start run 时，它正在监听 3000 的端口。当我尝试打开浏览器时，它会出现上面的错误消息。你能告诉我我做错了什么吗？

我试图用app.use(express.static('./data/fixtures')); 替换const fixtures = require('./data/fixtures'); 运行npm install 和npm start run，但它仍然是同样的错误。有人可以帮忙吗？

"use strict";

const express = require('express');
const bodyParser = require('body-parser');
const port = 3000;
const hostname = '127.0.0.1';

const app = express();
app.use(bodyParser.json());

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

let fixturesDB = JSON.parse(JSON.stringify(fixtures));

const HTTP_STATUS_CODE_NOT_FOUND = 404;

const getFixtureById = id =>
  fixturesDB.find(fixture => fixture.fixtureId === id);

const getFixtureIndex = id =>
  fixturesDB.findIndex(fixture => fixture.fixtureId === id);

const randomIntBetweenMinMax = (min, max) =>
  Math.floor(Math.random() * max) + min;

const secondsToMillis = seconds => seconds * 1000;

const betweenOneAndFiveSecondsInMillis = () =>
  secondsToMillis(randomIntBetweenMinMax(1, 5));

const delayPutAction = fixture =>
  new Promise((resolve, reject) => {
    setTimeout(() => {
      fixturesDB.push(fixture);
      resolve();
    }, betweenOneAndFiveSecondsInMillis());
  });

const checkIfFixtureExists = fixtureId => getFixtureIndex(fixtureId) !== -1;

const fixtureNotFound = res =>
  res.status(HTTP_STATUS_CODE_NOT_FOUND).send("Fixture not found");

app.get("/fixtures", (req, res) => res.json(fixturesDB));

app.get("/fixture/:id", (req, res) => {
  const fixtureId = req.params.id;
  checkIfFixtureExists(fixtureId)
    ? res.json(getFixtureById(fixtureId))
    : fixtureNotFound(res);
});

app.post("/fixture", async (req, res) => {
  await delayPutAction(req.body);
  res.send("Fixture has been added");
});

app.delete("/fixture/:id", (req, res) => {
  const fixtureId = req.params.id;


  if (checkIfFixtureExists(fixtureId)) {
    fixturesDB = fixturesDB.filter(fixture => fixture.fixtureId !== fixtureId);
    res.send("Fixture has been deleted");
  } else {
    fixtureNotFound(res);
  }
});

app.listen(port, hostname, () => console.log("Server is listening on port 3000"));

url http://localhost:3000 应该显示 ./fixtures 的内容，它们是响应 Json 数据，而不是错误消息“CANNOT GET/”

Answer 1

1. 您没有'/' 路由，因此没有CANNOT GET /。如果您希望它指向现有的 '/fixture' 路由，您可以执行类似 app.get('/', (req, res) => res.redirect('/fixtures')) 的操作
2. 您可以使用静态中间件（尽管在您的情况下它不是很合适）：
   • 您需要将其指向一个目录，例如app.use('/', express.static('./data/fixtures'))
   • ./data/fixtures/ 目录中的文件在指定的路径上可用，例如http://localhost:3000/fixtures/list.html 指向'./data/fixtures/list.html'
   • 您可以覆盖静态中间件的默认索引文件，例如app.use('/', express.static('./data/fixtures', {index: 'list.html'})) 将使http://localhost:3000 显示./data/fixtures/list.html