I am new to Node js

My code is 

var headers ;
var options = {

  host: 'google.com',
  port: 80,
          path: '/game/index.php',
                                method: 'POST',
headers:headers
                     };





function BalanceUpdate(stream ,flag)
{

// console.log("\n BalanceUpdate...................flag"+flag+"\n");
 if(stream != 'undefined' &&  stream.balance !='NaN ')
  {
 
  try
 {
     // console.log("\n BalanceUpdate yyyyyyyyyyyyyyyyyy 
"+stream.uid+"&balance="+stream.balance+" stream.id = "+stream.id+"\n");
var str = "uid="+stream.uid+"&balance="+stream.balance;
var len =str.length;


//  //// console.log("VVVVVVVVVVVVVVPlayer Data From Server :" + str);
options.headers ={'Content-length' : len, 'Content-Type': 
'application/x-www-form-urlencoded'}                                   
var request = http.request(options, function (response)
{
 //  //// console.log("@@@@@@@@@@@@@@@@@@@@Player Data From Server :" + 
str);
response.on('data', function (str) 
{
// console.log("\nVVVVVVVVVVVVVV BalanceUpdate Data From Server :" + 
str+"\n");
});
response.on('error', function (err) 
{
// console.log("\n BalanceUpdate Error From Server response :" + err+"\n");
});

response.on('end', function () {
});
 });
request.write( str +"\0");
 request.on('error', function (err) 
{
 // console.log("\n BalanceUpdate Error From Server request:" + err+"\n");  
});
 // the data to POST needs to be a string or a buffer
 request.end();
   }
 
 catch (err )
 {
// console.log("\n BalanceUpdate Update Error "+err+"\n");
 }
 }
 
 else
 {
 // console.log("\n BalanceUpdate zzzzzzzzzzzzzzzzzzzzzzz 
"+stream.uid+"&balance="+stream.balance+" stream.id = "+stream.id+"\n");
 }


}


Some time it works ,some times not. Please help me

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