node.js - Nodejs express request headers - get the referrer, etc. -

i post form payment gateway https verify payment etc. need verify post infact domain.

im trying verify referrer list of domains in req.headers dont see referrer|referer options:

{ 'x-real-ip': '123.34.45.176',   'x-forwarded-for': '123.34.45.176',   host: 'my.foo.com',   'x-nginx-proxy': 'true',   connection: 'close',   'user-agent': 'mozilla/4.0 (compatible; msie 5.01; windows nt 5.0)',   accept: '*/*',   'content-length': '441',   'content-type': 'application/x-www-form-urlencoded' } 

why headers empty of fields such referer, origin etc ?

this inside post:

app.post('/payment/notify/', function(req, res){    req.headers }) 

not requests have referer header.

if last page browser on secure server (https) not transmit referer you.

also, if user types address address bar don't referer well.