Node.js "write after end" error

Node.js "write after end" error

本文关键字：quot end error after write Node js      更新时间：2023-09-26

从一个基本的节点应用程序开始，我不知道如何解决这个"结束后写入"的错误，即使有几个网站建议的回调。

index.js: 

var server = require("./server");
var router = require("./router");
var requestHandlers = require("./requestHandlers");
var handle = {}
handle["/"] = requestHandlers.start;
handle["/start"] = requestHandlers.start;
handle["/upload"] = requestHandlers.upload;
server.start(router.route, handle);

server.js: 

var http = require("http");
var url = require("url");
function start(route, handle) {
  function onRequest(request, response) {
    var postData ="";
    var pathname = url.parse(request.url).pathname;
    console.log("Request for " + pathname + " received.");
    route(handle, pathname, response);
   }
  http.createServer(onRequest).listen(8888);
  console.log("Server has started.");
}
exports.start = start;

router.js: 

function route(handle, pathname, response) {
  console.log("About to route a request for " + pathname);
  if (typeof handle[pathname] === 'function') {
    handle[pathname](response);
  } 
  else {
    console.log("No request handler found for " + pathname);
    response.writeHead(404, {"Content-Type": "text/plain"});
    response.write("404 Not found");
    response.end();
  }
}
exports.route = route;
and now the culprit, requestHandlers.js:
function start(response) {
  console.log("Request handler 'start' was called.");
  var body = '<html>'+
    '<head>'+
    '<meta http-equiv="Content-Type" content="text/html; '+
    'charset=UTF-8" />'+
    '</head>'+
    '<body>'+
    '<div>Hello Start</div>' +
    '</body>'+
    '</html>';
    response.writeHead(200, {"Content-Type": "text/html"});
    response.write(body);
    response.end();
}
function upload(response) {
    console.log("Request handler 'upload' was called");
    response.writeHead(200, {"Content-Type": "text/plain"}); 
    response.write("Hello Upload");
    response.end();
}
exports.start = start;
exports.upload = upload;

这里是堆栈跟踪:

C02RF8L7FVH5:HelloWorld franco $ node index.js服务器已启动。请求/收到。即将路由对/的请求请求处理程序"start"被调用。即将路由对/的请求请求处理程序"start"被调用。events.js: 141把呃;//未处理的'error'事件^

错误:write after end在ServerResponse.OutgoingMessage.write (_http_outgoing.js:430:15)在对象。开始 (/用户/francop/文件/应用程序/HelloWorld/requestHandlers.js: 18:14)at route (/Users/franco/Documents/Apps/HelloWorld/router.js:5:21)在IncomingMessage。(/用户/francop/文件/应用程序/HelloWorld/server.js:十九章)at emitNone (events.js:67:13)在IncomingMessage。发出(events.js 166:7):at endreadable (_stream_readable.js:921:12)在nextTickCallbackWith2Args (node.js:442:9)在过程。_tickCallback (node . js: 356:17)

我在任何地方找到的唯一答案是"它是异步的，所以使用回调"，像这样:

response.write(body, function(err) {
    response.end();
});

…会抛出完全相同的错误。

任何帮助这将是惊人的。我在网上找到的几个稀疏的答案根本没有帮助。

谢谢!

用response.end()代替response.write()返回正文

function start (response) {
    console.log("Request handler 'start' was called.");
    var body = '<html>'+
    '<head>'+
    '<meta http-equiv="Content-Type" content="text/html; '+
    'charset=UTF-8" />'+
    '</head>'+
    '<body>'+
    '<div>Hello Start</div>' +
    '</body>'+
    '</html>';
    response.writeHead(200, {"Content-Type": "text/html"});
    response.end(body);
}
<标题>编辑1:

第一次调用response.write()，它将发送缓冲的头信息和第一个正文给客户端。第二次调用response.write()时，Node.js假定您将流式传输数据，并将其单独发送。也就是说，响应被缓冲到body的第一个块。

所以，如果你只想发送一个块，你必须使用response.end(body)，如果你想发送多个块，你必须在多个response.write()之后用response.end()结束调用。

单块示例:

function (chunk){
    response.end(chunk);
}

多块示例:

function (chunkArray){
    // loop on chunks 
    for(var i=0; i < chunkArray.length; i++){
        response.write(chunkArray[i]);                
    }
    // end the response with empty params
    response.end();
}

这是一个来自"The Node初学者"的例子

我已经重新发布了下面的文件，因为在这篇文章的时候，在你的文章中没有"router.js"answers"requestHanders.js"之间的分离。

当我在节点v8中运行这个时，我遇到了同样的问题，当前运行的事件节点v9.5.0。我并不是说这是一个解决问题的方法，只是说它对我有效。也许这个问题在更新版本中解决了，我不能肯定。

你的错误流读"requestHandlers.js:18:14"，你可能会得到更好的结果，如果你确认第18行是在你的代码(在未来)。不带空格的第18行是上传函数声明的前一行。实际上，此错误是由"response.end();"

index.js 

var server = require("./server");
var router = require("./router");
var requestHandlers = require("./requestHandlers");
var handle = {}
handle["/"] = requestHandlers.start;
handle["/start"] = requestHandlers.start;
handle["/upload"] = requestHandlers.upload;
server.start(router.route, handle);

router.js 

function route(handle, pathname, response) {
  console.log("About to route a request for " + pathname);
  if (typeof handle[pathname] === 'function') {
    handle[pathname](response);
  } 
  else {
    console.log("No request handler found for " + pathname);
    response.writeHead(404, {"Content-Type": "text/plain"});
    response.write("404 Not found");
    response.end();
  }
}
exports.route = route;

server.js 

var http = require("http");
var url = require("url");
function start(route, handle) {
  function onRequest(request, response) {
    var postData ="";
    var pathname = url.parse(request.url).pathname;
    console.log("Request for " + pathname + " received.");
    route(handle, pathname, response);
   }
  http.createServer(onRequest).listen(8888);
  console.log("Server has started.");
}
exports.start = start;

requestHandlers.js 

function start(response) {
  console.log("Request handler 'start' was called.");
  var body = '<html>'+
    '<head>'+
    '<meta http-equiv="Content-Type" content="text/html; '+
    'charset=UTF-8" />'+
    '</head>'+
    '<body>'+
    '<div>Hello Start</div>' +
    '</body>'+
    '</html>';
    response.writeHead(200, {"Content-Type": "text/html"});
    response.write(body);
    response.end();
}
function upload(response) {
    console.log("Request handler 'upload' was called");
    response.writeHead(200, {"Content-Type": "text/plain"}); 
    response.write("Hello Upload");
    response.end();
}
exports.start = start;
exports.upload = upload;
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