通过节点 js 中的 http 模块设置服务器时出现“未处理的错误”消息

Question

我一直在编写以下代码来通过 node.js 设置基本服务器。 我的代码 -

    const http  = require('http')
    const server = http.createServer((req, res) => {
    // console.log(req)
      if(req.url === '/'){
          res.end("Welcome to our home page")
      }
      if(req.url === '/aboutus'){
          res.end("Welcome to about us page")
      }
      res.end(`
          <h1> OOPS !!! </h1>
          <p>You have requested for any wrong address </p>
          <a href = "/">Get back to HOME Page</a>
     `)
    })
    server.listen(5000)

但是这段代码在运行时在我的控制台中给出了以下错误。 错误--

node:events:368
      throw er; // Unhandled 'error' event
      ^

Error [ERR_STREAM_WRITE_AFTER_END]: write after end
    at new NodeError (node:internal/errors:371:5)
    at ServerResponse.end (node:_http_outgoing:846:15)
    at Server.<anonymous> (/home/tirtharaj/MERN/Node/tutorial(fcc)/8-Built-in Modules/6-httpModule(brief).js:10:9)
    at Server.emit (node:events:390:28)
    at parserOnIncoming (node:_http_server:951:12)
    at HTTPParser.parserOnHeadersComplete (node:_http_common:128:17)
Emitted 'error' event on ServerResponse instance at:
    at emitErrorNt (node:_http_outgoing:726:9)
    at processTicksAndRejections (node:internal/process/task_queues:84:21) {
  code: 'ERR_STREAM_WRITE_AFTER_END'
}

我在我的代码中找不到任何错误。 Web 浏览器中的任何刷新都会出现错误。所以请帮我运行这段代码。

Answer 1

这将解决您的问题，您需要将所有代码包装在 if else 语句中，以便它始终可以通过代码只有一个可能的路径成功终止。

const http = require("http");
const server = http.createServer((req, res) => {
  if (req.url === "/") {
    res.end("Welcome to our home page");
  } else if (req.url === "/aboutus") {
    res.end("Welcome to about us page");
  } else {
    res.end(`
        <h1> OOPS !!! </h1>
        <p>You have requested for any wrong address </p>
        <a href = "/">Get back to HOME Page</a>
    `);
  }
});
server.listen(5000);

就我个人而言，我会为此使用 switch case 语句来保持它的整洁。

const http = require("http");
const server = http.createServer((req, res) => {
  switch (req.url) {
    case "/":
      res.end("Welcome to our home page");
      break;

    case "/aboutus":
      res.end("Welcome to about us page");
      break;

    default:
      res.end(`
        <h1> OOPS !!! </h1>
        <p>You have requested for any wrong address </p>
        <a href = "/">Get back to HOME Page</a>
      `);
      break;
  }
});
server.listen(5000);