The 'Access-Control-Allow-Origin' header contains multiple values
angularjs-http, asp.net-web-api, cors
Solution
I added
`config.EnableCors(new EnableCorsAttribute(Properties.Settings.Default.Cors, "", ""))`
as well as
`app.UseCors(CorsOptions.AllowAll);`
on the server. This results in two header entries. Just use the latter one and it works.
Problem
I'm using AngularJS $http on the client side to access an endpoint of a ASP.NET Web API application on the server side. As the client is hosted on a different domain as the server, I need CORS. It works for $http.post(url, data). But as soon as I authenticate the user and make a request via $http.get(url), I get the message ``` The 'Access-Control-Allow-Origin' header contains multiple values 'http://127.0.0.1:9000, http://127.0.0.1:9000', but only one is allowed. Origin 'http://127.0.0.1:9000' is therefore not allowed access. ``` Fiddler shows me that there are indeed two header entries in the get request after a successful options request. What and where am I doing something wrong? Update When I use jQuery $.get instead of $http.get, the same error message appears. So this seems no issue with AngularJS. But where is it wrong?