validate connection step

src/app/browser/main/tab/page.cpp

@@ -131,11 +131,24 @@ void Page::update()
                     ), .25
                 );
 
+                try
+                {
                     GioSocketConnection_RefPtr = GioSocketClient_RefPtr->connect_to_uri_finish(
                         result
                     );
+                }
 
-                // Request
+                catch (const Glib::Error & EXCEPTION)
+                {
+                    set(
+                        pageNavbar->get_request_host(),
+                        EXCEPTION.what(), 1
+                    );
+                }
+
+                // Connection established, begin request
+                if (GioSocketConnection_RefPtr != nullptr)
+                {
                     const Glib::ustring request = pageNavbar->get_request_text() + "\r\n";
 
                     GioSocketConnection_RefPtr->get_output_stream()->write_async(
@@ -212,6 +225,7 @@ void Page::update()
                         }
                     );
                 }
+            }
         );
     }