How to enable CORS in asp.net Self-Hosted API?

Question

I created one self-hosted Web API in asp.net it works fine when I call it from POSTMAN but it gives below error when I invoke it from browser.

Access to XMLHttpRequest at 'http://localhost:3273/Values/GetString/1' from origin 'http://localhost:4200' has been blocked by CORS policy: No 'Access-Control-A

Below given is my service class

using System.Web.Http;
using System.Web.Http.SelfHost;

namespace SFLSolidWorkAPI
{
    public partial class SolidWorkService : ServiceBase
    {
        public SolidWorkService()
        {
            InitializeComponent();
        }

        protected override void OnStart(string[] args)
        {
            var config = new HttpSelfHostConfiguration("http://localhost:8069");


            config.Routes.MapHttpRoute(
               name: "API",
               routeTemplate: "{controller}/{action}/{id}",
               defaults: new { id = RouteParameter.Optional }
           );

            HttpSelfHostServer server = new HttpSelfHostServer(config);
            server.OpenAsync().Wait();
        }

        protected override void OnStop()
        {
        }
    }

}

Have you try to use Microsoft.AspNet.WebApi.Cors? Docs learn.microsoft.com/en-us/aspnet/web-api/overview/security/… — abestrad
– abestrad, Commented Feb 9, 2019 at 15:33
Yes I try but it not work for me Even I try to Enable cros on controller level but it also not work — KEVAL PANCHAL
– KEVAL PANCHAL, Commented Feb 9, 2019 at 16:27
Use a sniffer like wireshark or fiddler. Compare working Postman results with non working app. Modify app so http headers are the same as Postman. — jdweng
– jdweng, Commented Feb 9, 2019 at 17:24
Make sure your service is setting the following headers, "Access-Control-Allow-Origin", "*" "Access-Control-Allow-Headers", "Cache-Control, Pragma, Origin, Authorization, Content-Type, X-Requested-With" "Access-Control-Allow-Methods", "GET, PUT, POST" — abestrad
– abestrad, Commented Feb 10, 2019 at 14:43
Add added [EnableCors(origins: "*", headers: "*", methods: "*")] on controller level but still it not working. — KEVAL PANCHAL
– KEVAL PANCHAL, Commented Feb 11, 2019 at 7:58

KEVAL PANCHAL · Accepted Answer · 2019-05-08 07:58:56Z

Here,

I found solution for this problem after so many research. You just need to install Microsoft.AspNet.WebApi.Cors and use it like config.EnableCors(new EnableCorsAttribute("*", headers: "*", methods: "*"));

Hope it will help others.

Thanks

using System;
using System.ServiceProcess;
using System.Web.Http;
using System.Web.Http.Cors;
using System.Web.Http.SelfHost;

namespace SFLSolidWorkAPI
{
    public partial class DemoService : ServiceBase
    {
        public DemoService ()
        {
            InitializeComponent();
        }

        protected override void OnStart(string[] args)
        {
            var config = new HttpSelfHostConfiguration("http://localhost:8069");


            config.Routes.MapHttpRoute(
               name: "API",
               routeTemplate: "{controller}/{action}/{id}",
               defaults: new { id = RouteParameter.Optional }
           );
            config.EnableCors(new EnableCorsAttribute("*", headers: "*", methods: "*"));

            HttpSelfHostServer server = new HttpSelfHostServer(config);
            server.OpenAsync().Wait();
        }

        protected override void OnStop()
        {
        }
    }

}

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