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();
}
标题>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"one_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;