improve api server error handling

Pilz.Net/Api/ApiServer.cs

@@ -85,7 +85,7 @@ public class ApiServer(string apiUrl) : IApiServer
 
     protected void ListenerCallback(IAsyncResult result)
     {
-        HttpListenerContext context;
+        HttpListenerContext? context;
 
         // Skip if not lisstening anymore
         if (!httpListener.IsListening)
@@ -96,15 +96,20 @@ public class ApiServer(string apiUrl) : IApiServer
         {
             context = httpListener.EndGetContext(result);
         }
-        catch (HttpListenerException)
+        catch (Exception ex)
         {
-            return;
+            Log.ErrorFormat("Error at getting context: ", ex.ToString());
+            context = null;
         }
 
         // Immitatly listen for new request
         if (AllowMultipleRequests)
             Receive();
 
+        // Cancel if we don't have a context
+        if (context is null)
+            return;
+
         // Check context
         OnCheckContext?.Invoke(this, new(context));
         try
@@ -113,7 +118,7 @@ public class ApiServer(string apiUrl) : IApiServer
         }
         catch (Exception ex)
         {
-            Log.Error(ex.ToString());
+            Log.ErrorFormat("Error at checking context: ", ex.ToString());
             if (DebugMode)
                 throw;
         }