CORS

client.js

$.ajax({
  url: 'http://beda.dio.jit.su/ping',
  contentType: 'application/json',
  dataType: 'json',
  data: {},
  type: 'POST',
  beforeSend: function(xhr) {
    xhr.setRequestHeader('x-Token-Sns','Test'); // header key name case-insensitive
  }
})
.success(function (res) {
  $('#content').html(JSON.stringify(res));
})
.error(function (err) {
  console.log(err);
});

p.js

exports = module.exports = function(options){
	options = options || {}
	
	return function raw(req, res, next) {
		res.header("Access-Control-Allow-Origin", "*")
		res.header('Access-Control-Allow-Methods', 'PUT, GET, POST, DELETE, OPTIONS')
		res.header("Access-Control-Allow-Headers", 'X-Requested-With, X-Token-Sns, X-Method-Type, Content-Type')
		next()
	}
};

server.js

var express = require('express')
var server = express.createServer()
server.use(require('./p')())

server.get('/ping', function(req, res){
  res.send({reply : "pong"})
})

server.listen(8000)