Fixed: favion.ico request does not require AuthenticationService

Closes #4910

src/Sonarr.Http/Authentication/AuthenticationService.cs

@@ -167,6 +167,11 @@ namespace Sonarr.Http.Authentication
                 return true;
             }
             
+            if (context.Request.IsFavIconRequest())
+            {
+                return true;
+            }
+            
             if (context.Request.IsPingRequest())
             {
                 return true;

src/Sonarr.Http/Extensions/RequestExtensions.cs

@@ -50,6 +50,11 @@ namespace Sonarr.Http.Extensions
             return !request.Path.EqualsIgnoreCase("/initialize.js") && request.Path.EndsWith(".js", StringComparison.InvariantCultureIgnoreCase);
         }
 
+        public static bool IsFavIconRequest(this Request request)
+        {
+            return request.Path.EqualsIgnoreCase("/favicon.ico");
+        }
+
         public static bool IsSharedContentRequest(this Request request)
         {
             return request.Path.StartsWith("/MediaCover/", StringComparison.InvariantCultureIgnoreCase) ||