CORS problem caused of NGINX doesn't forward clien't (browser) Request Header to Express JS so Origin value is undefined

I am trying implementing CORS policy on existing API server, so this is configuration :

1. API server hosted at https://apihost.mycompany.com built on nodejs+express behind NGINX with proxy pass enabled.

a. Here's nginx config :

server {
  listen       443 ssl;
  server_name  apihost.mycompany.com ;

  ssl_session_cache    shared:SSL:1m;
  ssl_session_timeout  5m;

  ssl_ciphers  HIGH:!aNULL:!MD5;
  ssl_prefer_server_ciphers  on;

  location / {
    proxy_pass http://localhost:5000;
    proxy_pass_request_headers on;
  }
}

b. Express JS on index.js page :

const whiteListOrigin =  ['https://livefrontend.server.com','http://192.168.1.200:3000'];
const whiteListReqMethods = ['GET', 'POST', 'PUT', 'DELETE', 'OPTIONS'];

var corsOptions = {
  
  origin: function (origin, callback) {
    if (whiteListOrigin.indexOf(origin) !== -1) {
      callback(null, true)
    } else {
      callback(new Error('Not allowed by CORS'))
    }
  },
  methods: whiteListReqMethods,
  allowedHeaders: ['Content-Type', 'Authorization', 'x-csrf-token'],
  credentials: true,
  maxAge: 600,
  exposedHeaders: ['*', 'Authorization' ],
  preflightContinue: true,
  optionsSuccessStatus: 204
};


app.use(cors(corsOptions));

3. Web app server as front end server hosted at http://192.168.1.200:3000 (non https) built by PHP+JQUERY and XAMPP. Here's the request code to API Server :

function getUserInfo(){
  $.ajax({
    type: "GET",
    url: `https://apihost.mycompany.com/info`,
    xhrFields: { withCredentials: true },
    dataType: "json",
    success: function(response) {
      // show the detail user
    },
    error: function(response){
      // show error message here
    },
  });
}

The browser Error message when the page doing request to API is :

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://apihost.mycompany.com/auth/info. (Reason: CORS request did not succeed). Status code: (null)

When I tried to log Origin value on Express it showed me UNDEFINED. So I guess the problem is because NGINX doesn't forward the client's/browser's request header to Express (API Server). I checked lot of CORS related question on SO and haven't got solution yet. Am I missing something on this configuration? Need suggestion and solution pls. Thanks.