七天七语言－－node.js篇 作业（http://be001.com/jams/445）

server.js

// 测试：
//   http://localhost:8888/?short_url=http://t.cn/zjUg9kQ（正确解析）
//   http://localhost:8888/?short_url=http://t.cn/zj4SIjW (有https请求，会报错)

var http = require('http');
var url = require('url');

function myParse(short_url, callback){
  var result = '';
  try{
    req = http.get(short_url, function(res) {
      if(res.statusCode == '302'){
        myParse(res.headers.location, callback);
      }
      else{
        res.setEncoding('utf8');
        res.on('data', function (chunk) {
          var m = chunk.match(/<title>(.+)<\/title>/);
          if(m) {
            result = "{ url: \"" + short_url + "\", title: \"" + m[1] + "\"}";
            console.log(result);
            callback(null, result);
          }
          else{
            callback(null, '');
          }
        })

      }
    }).on('', function(e){
      console.log("request error: " + e.message);
    });
  }
  catch(error){
    console.log(error.message);
  }
}

http.createServer(function(request, response) {
  var q = url.parse(request.url, true);
  var short_url;
  if(q.query && q.query.short_url){
    short_url = q.query.short_url;
    myParse(short_url, function(err, result){
      if(result.length){
        response.write(result);
        response.end();
      }
    });
  }

}).listen(8888);