New: Multi target net framework 4.6.2 and net core 3.0

src/NzbDrone.Host/WebHost/Middleware/SignalRMiddleware.cs

@@ -15,6 +15,7 @@ namespace Radarr.Host.Middleware
         private readonly IContainer _container;
         private readonly Logger _logger;
         private static string API_KEY;
+        private static string URL_BASE;
         public int Order => 1;
 
         public SignalRMiddleware(IContainer container,
@@ -24,6 +25,7 @@ namespace Radarr.Host.Middleware
             _container = container;
             _logger = logger;
             API_KEY = configFileProvider.ApiKey;
+            URL_BASE = configFileProvider.UrlBase;
         }
 
         public void Attach(IApplicationBuilder appBuilder)
@@ -55,11 +57,17 @@ namespace Radarr.Host.Middleware
                 }
             });
 
-            appBuilder.UseSignalR(routes =>
+#if NETCOREAPP3_0
+            appBuilder.UseEndpoints(x =>
             {
-                routes.MapHub<MessageHub>("/signalr/messages");
+                x.MapHub<MessageHub>(URL_BASE + "/signalr/messages");
             });
-
+#else
+            appBuilder.UseSignalR(x =>
+            {
+                x.MapHub<MessageHub>("/signalr/messages");
+            });
+#endif
             // This is a side effect of haing multiple IoC containers, TinyIoC and whatever
             // Kestrel/SignalR is using. Ideally we'd have one IoC container, but that's non-trivial with TinyIoC
             // TODO: Use a single IoC container if supported for TinyIoC or if we switch to another system (ie Autofac).