用node做一个http代理服务器的问题

我做的这台代理服务器作为网关，把来自公网客户端的请求通过http转发到内部的连天服务器，但在开发阶段由于客户端发送带未转义的双引号，换行符等字符，导致聊天服务器解析json数据包出错，从而未响应我的网关服务器。

我于是设置了请求超时，和错误事件处理，以结束客户端的请求。但即使这样，node写的网关服务器还是经常被挂起，即进程和端口一直在，但就是不能再响应来自客户端的请求了，最后返回server no reult。初次使用nodejs写，没有系统学习过，请大神帮忙看看我这代码有啥问题。

process.on('uncaughtException', function (err) {
  console.log('Caught exception: ' + err);
});

var config=require('./config.json');
if(config){
  for(var k in config){
    console.log(k+':'+config[k]);
  }
}
var LOCAL_PORT = config.localPort || 1337;
var REMOTE_PORT = config.mailchatServerPort || 7777;
var REMOTE_ADDR = config.mailchatServer || '10.25.2.17';

var log4js = require('log4js');
log4js.configure({
  appenders: [
    { type: 'console' },
    //{ type: 'file', filename: 'logs/cheese.log', category: 'cheese' },
    { type: 'dateFile', filename: 'info.log', pattern: '-yyyy-MM-dd', alwaysIncludePattern: false, category: 'dateFileLog' }
  ],
  replaceConsole:true,
  levels:{
      dateFileLog: 'INFO'
  }
});

var log = log4js.getLogger('dateFileLog');


http = require('http');
http.createServer(onRequest).listen(LOCAL_PORT);
log.info('Gateway Server listen at ' + LOCAL_PORT + '.');

function onRequest(client_req, client_res) {
  if(client_req.url.indexOf('/favicon.ico')==0) return;
  log.info('Request URL: ' + client_req.url);
  log.info('Request Header: ' + JSON.stringify(client_req.headers));
  var options = {
    hostname: REMOTE_ADDR,
    port: REMOTE_PORT,
    path: client_req.url,
    method: client_req.method,
    headers: client_req.headers
  };
  client_res.setHeader('Content-type','application/json');
  client_res.setHeader('Access-Control-Allow-Origin','*');
  var proxy = http.request(options, function (res) {
    log.info('From ChatServer STATUS: ' + res.statusCode);
    log.info('From ChatServer HEADERS: ' + JSON.stringify(res.headers));
    res.setEncoding('UTF8');
    res.pipe(client_res, {
      end: true
    });
  });

  proxy.on('error', function(e) {
    log.info('Problem with request from ChatServer: ' + e.message);
    client_res.statusCode=500;
    client_res.end();
    //client_res.end('cache server error: '+e.message);
  });

 proxy.setTimeout(10*1000, function(){
   log.info('Request Timeout From ChatServer in 10 seconds, then response code 500');
   client_res.statusCode=500;
   client_res.end();
   //client_res.end('Reuqest Timeout');
 });

 client_req.setTimeout(10*1000, function(){
   log.info('Timeout');
   client_res.statusCode=500;
   client_res.end();
 });

  client_req.pipe(proxy, {
    end: true
  });

}