set 10 min as the lifetime for each HttpMessageHandler int the pool

src/Web/WebMVC/Startup.cs

@@ -173,6 +173,7 @@ namespace Microsoft.eShopOnContainers.WebMVC
             services.AddTransient<HttpClientAuthorizationDelegatingHandler>();
             services.AddTransient<HttpClientRequestIdDelegatingHandler>();
 
+            //set 5 min as the lifetime for each HttpMessageHandler int the pool
             services.AddHttpClient("extendedhandlerlifetime").SetHandlerLifetime(TimeSpan.FromMinutes(5));
 
             //add http client services