writeHead doesn't work as expected when passing headers as second parameter about azure-function-express HOT 6 CLOSED

		res.writeHead(302, null, {
			'Access-Control-Allow-Origin': '*',
			'Location': path
		});

		res.end();

function end(context, data, encoding) {
  // 1. Write head
  this.writeHead(this.statusCode); // Make jshttp/on-headers able to trigger

  // 2. Return raw body to Azure Function runtime
  context.res.body = convertToBody(data, encoding);
  context.res.isRaw = true;
  context.done();
}

const express = require("express");
const createHandler = require("azure-function-express").createHandler;
const oauthshim = require('oauth-shim');
const param = require('oauth-shim/src/utils/param');

const app = express();

app.all('/api/oauth-btg', oauthshim);

// monkey patch for writeHead issue in azure-function-express
oauthshim.redirect = function (req, res, next) {
	if (req.oauthshim && req.oauthshim.redirect) {
		let hash = req.oauthshim.data;
		let path = req.oauthshim.redirect;

		path += (hash ? '#' + param(hash) : '');

		// bugfix: always pass statusMessage as second param
		res.writeHead(302, null, {
			'Access-Control-Allow-Origin': '*',
			'Location': path
		});

		res.statusCode = 302;
		res.end();
	}
	else if (next) {
		next();
	}
};

oauthshim.init([{
	client_id: 'XXX',
	client_secret: 'XXX',
	grant_url: 'https://login.microsoftonline.com/common/oauth2/v2.0/token',
	domain: 'XXX'
}]);

module.exports = createHandler(app);