Access-Control-Allow-Origin in MVC 5

Question

对预检请求的响应未通过访问控制检查：所请求的资源上不存在“ Access-Control-Allow-Origin”标头。响应的HTTP状态码为500。

Answer 1

In startup.auth.cs add the following code at the start of the ConfigureAuth method. You will need to install this Microsoft.Owin.Cors nuget package.

app.UseCors(Microsoft.Owin.Cors.CorsOptions.AllowAll);