从一个基本的节点应用开始,我无法弄清楚如何击败这个"写完后#34;错误,即使在几个站点上建议回调。
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;
这是堆栈跟踪:
C02RF8L7FVH5:HelloWorld francop $ node index.js 服务器已启动。 请求/收到。 即将发送请求/ 请求处理程序&#39; start&#39;被称为。 即将发送请求/ 请求处理程序&#39; start&#39;被称为。 events.js:141 扔掉//未处理的错误&#39;事件 ^
错误:写完后 在ServerResponse.OutgoingMessage.write(_http_outgoing.js:430:15) 在Object.start(/Users/francop/Documents/Apps/HelloWorld/requestHandlers.js:18:14) 在路线(/Users/francop/Documents/Apps/HelloWorld/router.js:5:21) 在IncomingMessage。 (/Users/francop/Documents/Apps/HelloWorld/server.js:19:6) 在emitNone(events.js:67:13) 在IncomingMessage.emit(events.js:166:7) at endReadableNT(_stream_readable.js:921:12) at nextTickCallbackWith2Args(node.js:442:9) at process._tickCallback(node.js:356:17)
我在任何地方找到的唯一答案是&#34;它是异步的所以请使用回调&#34;像这样:
response.write(body, function(err) {
response.end();
});
...这会引发完全相同的错误。
任何帮助都会令人惊讶。我在网上发现的一些稀疏答案根本没有帮助。
谢谢!
答案 0 :(得分:2)
以response.end()
代替response.write()
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);
}
第一次调用response.write()
时,它会将缓冲的头信息和第一个主体发送到客户端。第二次调用response.write()
时,Node.js假定您将成为流数据,并单独发送。也就是说,响应被缓冲到第一个身体块。
因此,如果您只想发送一个块,则必须使用response.end(body)
,如果要发送多个块,则必须在多个response.end()
之后使用response.write()
结束调用
function (chunk){
response.end(chunk);
}
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();
}
答案 1 :(得分:1)
这是来自&#34; Node Beginner&#34;
的示例我已经重新发布了以下文件,因为截至本文发布时,您的帖子与路由器之间没有分离。\ n \ n \ n&!路由器。\ n&#34;和&#34; requestHanders.js&#34;。
我在节点v8中运行此问题时遇到了同样的问题,当前运行时没有事件节点v9.5.0。我不是把它作为问题的解决方案,只是说它对我有用。也许这是一个在更新版本中解决的问题,我无法肯定地说。
您的错误流也会读取&#34; requestHandlers.js:18:14&#34;如果您确认代码中的第18行(将来),您可能会得到更好的结果。没有空格第18行是声明上传功能之前的行。事实上,这个错误是由&#34; response.end();&#34;
触发的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;