Fixes Issue# 3450

Docker-DCO-1.1-Signed-off-by: Gopikannan Venugopalsamy <gopikannan.venugopalsamy@gmail.com> (github: vgeta)

api.go

@@ -1054,7 +1054,7 @@ func makeHttpHandler(srv *Server, logging bool, localMethod string, localRoute s
 		}
 
 		if version == 0 || version > APIVERSION {
-			w.WriteHeader(http.StatusNotFound)
+			http.Error(w, fmt.Errorf("client and server don't have same version (client : %g, server: %g)", version, APIVERSION).Error(), http.StatusNotFound)
 			return
 		}