Add ResolveStreamUrl option to match TypeScript ServerEventsClient

src/ServiceStack.Client/ServerEventsClient.cs

@@ -96,8 +96,7 @@ public partial class ServerEventsClient : IDisposable
 
         public string ConnectionDisplayName => ConnectionInfo != null ? ConnectionInfo.DisplayName : "(not connected)";
 
-        public string EventStreamPath { get; set; }
-        public string EventStreamUri { get; private set; }
+        public Func<string, string> ResolveStreamUrl { get; set; }
 
         public string BaseUri
         {
@@ -133,6 +132,15 @@ private void BuildEventStreamUri()
                 .AddQueryParam("channels", string.Join(",", this.channels));
         }
 
+        public string EventStreamPath { get; set; }
+
+        private string eventStreamUri;
+        public string EventStreamUri
+        {
+            get => ResolveStreamUrl != null ? ResolveStreamUrl(eventStreamUri) : eventStreamUri;
+            private set => eventStreamUri = value;
+        }
+
         public IServiceClient ServiceClient { get; set; }
         public DateTime LastPulseAt { get; set; }
 
@@ -566,6 +574,7 @@ public void ProcessResponse(Stream stream)
         }
 
         private ServerEventMessage currentMsg;
+
         void ProcessLine(string line)
         {
             if (line == null) return;