从零开始学习Node.js系列教程五：服务器监听方法示例

var http = require('http');
var sniffer = require('./httpsniffer');
var server = http.createServer(function(req, res){
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end('Hello, World!\n');
});
sniffer.sniffOn(server);
server.listen(3000);

//http sniffer 监听每个服务器事件，然后输出每个事件的相关信息
var url = require('url');
var util = require('util');
exports.sniffOn = function(server){
  server.on('request', function(req, res){
    util.log('e_request');
    util.log(reqToString(req));
  });
  server.on('close', function(error){
    util.log('e_close error='   error);
  });
  server.on('checkContinue', function(req, res){
    util.log('e_checkContinue');
    util.log(reqToString(req));
    res.writeContinue();
  });
  server.on('upgrade', function(req, socket, head){
    util.log('e_upgrade');
    util.log(reqToString(req));
  });
  server.on('clientError', function(){
    util.log('e_clientError');
  });
}
var reqToString = function(req){
  var ret = 'request'   req.method   ' '   req.httpVersion   ' '   req.url   '\n';
  ret  = JSON.stringify(url.parse(req.url, true))   '\n';
  var keys = Object.keys(req.headers);
  for (var i = 0; i < keys.length; i  ){
    var key = keys[i];
    ret  = i   ' '   key   ': '   req.headers[key]   '\n';
  }
  if (req.trailers) ret  = req.trailers   '\n';
  return ret;
}
exports.reqToString = reqToString;