Refactored gxhttpclient implementation to utilize a singleton instance for reusing the connection pool of httpclient instances. Avoided using CookieContainer of handlers, as they are shared across the pooled connections. Instead, managed sending and receiving cookies as headers.

Author: claudiamurialdo

dotnet/src/dotnetframework/GxClasses/Core/gxconfig.cs

@@ -848,6 +848,7 @@ public class Preferences
 		const string DEFAULT_DS = "Default";
 		static int httpclient_max_per_route = -1;
 		static int sessionTimeout = -1;
+		static int singletonHttpClient = -1;
 		internal static string AppMainNamespace
 		{
 			get
@@ -1443,7 +1444,18 @@ internal static bool WrapSingleApiOutput
 					return DefaultWrapSingleApiOutput;
 			}
 		}
-		internal static string CorsAllowedOrigins()
+
+		public static bool SingletonHttpClient()
+		{
+			if (singletonHttpClient == -1)
+			{
+				if (Config.GetValueOf("SingletonHttpClient", out string sValue) && int.TryParse(sValue, out int value))
+					singletonHttpClient = value;
+			}
+			return singletonHttpClient==1;
+}
+
+	internal static string CorsAllowedOrigins()
 		{
 			if (Config.GetValueOf("CORS_ALLOW_ORIGIN", out string corsOrigin))
 				return corsOrigin;