反向代理

gistfile1.js

  var nodeStatic = require('node-static').Server;
  var request = require("request");
  var dns = require("dns");
  var fileServer = new nodeStatic("./");
  var http = require("http");
  
  var httpServer = http.createServer(function(req, res) {
        req.addListener('end', function() {
          fileServer.serve(req, res, function(err, result) {
              if (err && (err.status === 404)) {
              //本地没有文件访问线上，透明server
              dns.resolve4(req.headers.host,function(err,addresses){
                  if(err){
                      res.writeHeader(200,'text/html');   
                      res.write(req.url);
                      res.end(err);
                   }else{
                      var ip = addresses[0];
                      var p = 'http://'+ip+req.url;
                      req.headers['Host'] = req.headers.host;
                      request({
                          method:req.method,
                          url:p,
                          headers:req.headers
                      }).pipe(res);
                    } 
              });
              }
          });
      }).resume();
  });
  
  httpServer.listen('8080');