sir*_*lot 7 javascript node.js node.js-stream
从一个基本的节点应用程序开始,我无法弄清楚如何击败这个"写后结束"错误,即使在几个站点上建议的回调.
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;
这是堆栈跟踪:
C02RF8L7FVH5:HelloWorld francop $ node index.js服务器已启动.请求/收到.即将调用/ Request处理程序'start'的请求被调用.即将调用/ Request处理程序'start'的请求被调用.events.js:141 throw er; //未处理的'错误'事件^
错误:在路径(/ Users /)处的Object.start(/Users/francop/Documents/Apps/HelloWorld/requestHandlers.js:18:14)上的ServerResponse.OutgoingMessage.write(_http_outgoing.js:430:15)结束后写入francop/Documents/Apps/HelloWorld/router.js:5:21)IncomingMessage.(/Users/francop/Documents/Apps/HelloWorld/server.js:19:6)在emitNadableNT(_stream_readable.js)的IncomingMessage.emit(events.js:166:7)的emitNone(events.js:67:13)处:921:12)在process._tickCallback(node.js:356:17)的nextTickCallbackWith2Args(node.js:442:9)
我在任何地方找到的唯一答案是"它是异步所以使用回调"就像这样:
response.write(body, function(err) {
response.end();
});
...哪个引发完全相同的错误.
对此的任何帮助都会很棒.我在网上发现的一些稀疏答案根本没有帮助.
谢谢!
返回你的身体response.end()而不是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response.write()调用时，会将缓冲的头信息和第一个body发送给客户端。第二次response.write()调用时，Node.js 假设您将流式传输数据，并单独发送该数据。也就是说，响应被缓冲到正文的第一个块。
因此，如果您只想发送一个块，则必须使用response.end(body)，如果您想发送多个块，则必须使用response.end()after multiple来结束调用response.write()。
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();
}
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