我想评估客户端和服务器之间的往返时间。在这里用户可以选择消息(正文)的请求/响应大小应该有多大。在客户端,我使用Ajax-Post方法以100毫秒的间隔向http-server发送100条消息。 Unfortunatley我在node.js中遇到了问题,即httpServer.js无法处理大于8 kb的客户端请求大小。在这种情况下,httpServer.js中的变量responseSizeServer将获取值“undefined”,并且控制台会引发错误:“数组长度无效”。问题是为什么在这种情况下,变量responseSizeServer的值是undefined?我猜想http-Server.js处理.end方法比来自客户端的传入请求更快。你认为什么?如何解决?感谢提前:)请求大于8 kb
下面是代码:
客户端:
var i = 0;
var iterations = 100;
function connectSpeed(){
run = window.setInterval("startSpeed()", 100);
}
function startSpeed()
{
//Variablen
var requestSizeClient = 8 *1024; // 8 kb request Size client
var responseSizeServer = 16 * 1024; // 16 kb response size server
var xmlhttp;
xmlhttp = new XMLHttpRequest();
xmlhttp.open("POST","http://localhost:8000", true);
xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xmlhttp.onreadystatechange=function(){
if (xmlhttp.readyState==4 && xmlhttp.status==200){
var receiveTimeCl = new Date().getTime().toString();
//evaluate response from httpServer.js
var message = xmlhttp.responseText;
}
}
//send data to the server
xmlhttp.send(new Date().getTime().toString() + '#' + new Array((eval(requestSizeClient+1))-(new Date().getTime().toString().length+3)).join('X') + '#' + responseSizeServer);
i++;
if(i==iterations) {
window.clearInterval(run);
i=0;
}
}// end start-speed
服务器:在Node.js的(httpServer.js)
var http = require('http');
http.createServer(function (req, res) {
var receiveTimeServer;
var clientMsg;
var sendTimeClient;
var responseSizeServer;
var message;
req.on('data', function (chunk) {
receiveTimeServer = new Date().getTime().toString();
message = chunk.toString('utf8');
clientMsg = message.split('#');
responseSizeServer = parseInt(clientMsg[2]);
sendTimeClient = clientMsg[0];
res.writeHead(200, {'Content-Type': 'text/plain','Access-Control-Allow-Origin' : '*'});
res.end(receiveTimeServer + '#' + new Date().getTime().toString() + '#' + sendTimeClient + '#' + new Array(responseSizeServer).join('X'));
});
}).listen(8000);
console.log('Ajax_Server running');
非常感谢你,这是对的! – user3030559