nodejs socket hang up error in nested callback - node.js

Question

I try to put many callbacks in a callback, but the program will shut down after the return of several success requests and post "socket hang up" error. I try to collect data from response and output them at once, can someone tell me which part goes wrong...
By the way, I hide the details of request method, I promise the request method works on http call.
http.request(options1,function(data){
var condition=data.length;
var result=[];
data.foreach(item,function(data){
http.request(options2, function(data){
if(data) result.push(data);
condition--;
if(condition<=0) console.log(result);
}
});
});
for my http.request method
var request=function(options,callback){
http.request(options,function(res){
var body;
res.on('data',function(chunk){
body+=chunk;
});
res.on('end',function(){
callback(JSON.parse(body));
});
request.end();
};

Answer 1

That's not the correct usage of http.request().
The http.request() callback is passed an IncomingMessage object, not buffered response data.
EDIT: Your custom request() should look something like this, although you should handle errors too. Note the proper placement of request.end() and initializing var body = '':
function request(options, callback) {
http.request(options,function(res) {
var body = '';
res.setEncoding('utf8');
res.on('data',function(chunk) {
body += chunk;
}).on('end',function() {
callback(JSON.parse(body));
});
}).end();
}
You're missing .end() for your requests so that node.js knows you are ready to actually send the HTTP request: http.request(..., ....).end();. This is the cause of your particular error... the server hangs up the connection because it got tired of waiting for your request after the TCP connection was opened.