minimal improvements for autorestart and slot handling

Pilz.Net/Api/ApiServer.cs

@@ -18,6 +18,7 @@ public class ApiServer(string apiUrl) : IApiServer
     protected DateTime lastRestartAttempt;
     protected SemaphoreSlim? semaphore;
     protected bool doListen;
+    protected bool isAutoRestarting;
 
     public event OnCheckAuthenticationEventHandler? OnCheckAuthentication;
     public event OnCheckContextEventHandler? OnCheckContext;
@@ -89,10 +90,13 @@ public class ApiServer(string apiUrl) : IApiServer
 
     protected virtual bool AutoRestart(bool graceful)
     {
+        if (isAutoRestarting)
+            return true;
+
         if (restartAttempts > MaxAutoRestartsPerMinute)
         {
             Log.Fatal("Reached maximum auto-restart attempts");
-            Stop();
+            Stop(false);
             return false;
         }
 
@@ -102,7 +106,9 @@ public class ApiServer(string apiUrl) : IApiServer
 
         restartAttempts += 1;
 
+        isAutoRestarting = true;
         Restart(graceful);
+        isAutoRestarting = false;
 
         return true;
     }
@@ -253,9 +259,11 @@ public class ApiServer(string apiUrl) : IApiServer
         // Check context
         Log.Info("Request retrived for " + context.Request.RawUrl);
         OnCheckContext?.Invoke(this, new(context));
+        var success = false;
         try
         {
             CheckContext(context);
+            success = true;
         }
         catch (Exception ex)
         {
@@ -268,12 +276,23 @@ public class ApiServer(string apiUrl) : IApiServer
             OnCheckContextCompleted?.Invoke(this, new(context));
         }
 
+        // Try closing the request on fail
+        if (!success)
+        {
+            try
+            {
+                context.Response.Close();
+            }
+            catch (Exception)
+            {
+            }
+        }
+
+        FreeSlot();
+
         // Listen for new request
         if (!AllowMultipleRequests)
-        {
-            FreeSlot();
             Receive();
-        }
     }
 
     protected virtual void CheckContext(HttpListenerContext context)