angularjs - Angular: 'Access-Control-Allow-Origin' header is present on the requested resource -


i've read alot of same or similar questions , answers configure server. client app angular.js "ionic" server app node.js , deployed on heroku. here server configuration:

// set cors resource sharing app.use(function(req, res, next){     res.header('access-control-allow-origin', '*');     res.header('access-control-allow-methods', 'get,put,post,delete');     res.header('access-control-allow-headers', 'content-type, authorization');     res.header('access-control-allow-credentials', true);     next(); })

note: client communicate server when run server locally

my client app fail make http request , getting error:

xmlhttprequest cannot load https://myheroku.herokuapp.com/api/x. no 'access-control-allow-origin' header present on requested resource. origin 'http://localhost:8100' therefore not allowed access. response had http status code 503.

here request header:

accept:*/* accept-encoding:gzip, deflate, sdch accept-language:en-us,en;q=0.8,ar;q=0.6,fi;q=0.4,it;q=0.2,en-gb;q=0.2,en-ca;q=0.2 access-control-request-headers:accept, authorization access-control-request-method:get connection:keep-alive host:myheroku.herokuapp.com origin:http://localhost:8100 referer:http://localhost:8100/

am sorry if it's silly mistake maybe useful beginners me. checked server app logs heroku logs , found 

heroku process failed bind $port within 60 seconds of launch

and since heroku assign port app how fixed issue: from:

var server = app.listen(3000, function(){     console.log('app listeining on', server.address().port); })

to:

var server = app.listen(process.env.port || 5000, function(){     console.log('app listeining on', server.address().port); })

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