diff --git a/superset/templates/superset/models/database/macros.html b/superset/templates/superset/models/database/macros.html
index ae67e4b78f728..f1d07220ef523 100644
--- a/superset/templates/superset/models/database/macros.html
+++ b/superset/templates/superset/models/database/macros.html
@@ -22,7 +22,7 @@
       .append('<button id="testconn" class="btn btn-sm btn-primary">{{ _("Test Connection") }}</button>');
     $("#testconn").click(function(e) {
       e.preventDefault();
-      var url = "/superset/testconn";
+      var url = "/api/v1/database/test_connection";
       var csrf_token = "{{ csrf_token() if csrf_token else '' }}";
 
       $.ajaxSetup({
diff --git a/superset/views/core.py b/superset/views/core.py
index 8fd50bb184e2b..5dc8b6e5abc79 100755
--- a/superset/views/core.py
+++ b/superset/views/core.py
@@ -1333,6 +1333,11 @@ def add_slices(  # pylint: disable=no-self-use
     @expose("/testconn", methods=["POST", "GET"])
     def testconn(self) -> FlaskResponse:  # pylint: disable=no-self-use
         """Tests a sqla connection"""
+        logger.warning(
+            "%s.testconn "
+            "This API endpoint is deprecated and will be removed in version 3.0.0",
+            self.__class__.__name__,
+        )
         db_name = request.json.get("name")
         uri = request.json.get("uri")
         try: