问使用NGINX时，无法在Node.js下使用AJAX发出GET请求

EN

app.get("/",function(req,res){

    app.use(express.static(__dirname + '/'));

        app.get("/mypath/",function(req,res){
            console.log("please tell me that you arrive here"); //This actually never happens
            //some functions using the data in "req" and putting there in var "data"
            res.send(data);
        });
});

$.ajax({
        url: 'http://localhost:3000/mypath/',
        type: 'GET',
        data: {//some data to use on the server},
        dataType: "json",
        complete: function(data){
          //some stuff with the transformed data
        },
    });

var express = require('express');
var app = express();
var request = require("request");
var db = require('mysql');
const path = require('path');
var http = require("http").Server(app);
var io = require("/usr/local/lib/node_modules/socket.io").listen(http);

http.listen(3000, 'localhost'); //At the end of everything between here and the code.

app.use(express.static(__dirname + '/'));

app.get('/reqData',function(req,res){
    //I never arrive here
    console.log("print that I am here");
                transform(req.query.selection1,req.query.selection2,function(){
                res.json(data); //data is transformed globally  
                });

});

function requestData(){
     $.ajax({
            url: 'http://localhost:3000/reqData',
            type: 'GET',
            data: {//Some stuff to send},
            dataType: "json",
            complete: function(data){

              do(data);
            },
            error: function(e){

              console.log(e);
            }
       });

    }