Web auth

src/Jackett/Utils/WebApiRootRedirectMiddleware.cs

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+using Microsoft.Owin;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Jackett.Utils
+{
+    public class WebApiRootRedirectMiddleware : OwinMiddleware
+    {
+        public WebApiRootRedirectMiddleware(OwinMiddleware next)
+            : base(next)
+        { 
+        }
+
+        public async override Task Invoke(IOwinContext context)
+        {
+            var url = context.Request.Uri;
+            if (string.IsNullOrWhiteSpace(url.AbsolutePath) || url.AbsolutePath == "/")
+            {
+                // 301 is the status code of permanent redirect
+                context.Response.StatusCode = 301;
+                context.Response.Headers.Set("Location", "/Admin/Dashboard");
+            }
+            else
+            {
+                await Next.Invoke(context);
+            }
+        }
+    }
+}