diff --git a/superset-frontend/src/featureFlags.ts b/superset-frontend/src/featureFlags.ts
index 1bac02dcb..8183cfa87 100644
--- a/superset-frontend/src/featureFlags.ts
+++ b/superset-frontend/src/featureFlags.ts
@@ -19,6 +19,7 @@
 // We can codegen the enum definition based on a list of supported flags that we
 // check into source control. We're hardcoding the supported flags for now.
 export enum FeatureFlag {
+  ALLOW_DASHBOARD_DOMAIN_SHARDING = 'ALLOW_DASHBOARD_DOMAIN_SHARDING',
   OMNIBAR = 'OMNIBAR',
   CLIENT_CACHE = 'CLIENT_CACHE',
   SCHEDULED_QUERIES = 'SCHEDULED_QUERIES',
@@ -49,7 +50,9 @@ declare global {
 }
 
 export function initFeatureFlags(featureFlags: FeatureFlagMap) {
-  window.featureFlags = featureFlags || {};
+  if (!window.featureFlags) {
+    window.featureFlags = featureFlags || {};
+  }
 }
 
 export function isFeatureEnabled(feature: FeatureFlag) {
diff --git a/superset-frontend/src/utils/hostNamesConfig.js b/superset-frontend/src/utils/hostNamesConfig.js
index a216cbee1..8a9f208cc 100644
--- a/superset-frontend/src/utils/hostNamesConfig.js
+++ b/superset-frontend/src/utils/hostNamesConfig.js
@@ -16,6 +16,12 @@
  * specific language governing permissions and limitations
  * under the License.
  */
+import {
+  initFeatureFlags,
+  isFeatureEnabled,
+  FeatureFlag,
+} from 'src/featureFlags';
+
 function getDomainsConfig() {
   const appContainer = document.getElementById('app');
   if (!appContainer) {
@@ -23,8 +29,13 @@ function getDomainsConfig() {
   }
 
   const bootstrapData = JSON.parse(appContainer.getAttribute('data-bootstrap'));
+  // this module is a little special, it may be loaded before index.jsx,
+  // where window.featureFlags get initialized
+  // eslint-disable-next-line camelcase
+  initFeatureFlags(bootstrapData?.common?.feature_flags);
   const availableDomains = new Set([window.location.hostname]);
   if (
+    isFeatureEnabled(FeatureFlag.ALLOW_DASHBOARD_DOMAIN_SHARDING) &&
     bootstrapData &&
     bootstrapData.common &&
     bootstrapData.common.conf &&
diff --git a/superset/config.py b/superset/config.py
index fa5b3857f..d469b047b 100644
--- a/superset/config.py
+++ b/superset/config.py
@@ -298,6 +298,10 @@ LANGUAGES = {}
 # and FEATURE_FLAGS = { 'BAR': True, 'BAZ': True } in superset_config.py
 # will result in combined feature flags of { 'FOO': True, 'BAR': True, 'BAZ': True }
 DEFAULT_FEATURE_FLAGS: Dict[str, bool] = {
+    # allow dashboard to use sub-domains to send chart request
+    # you also need ENABLE_CORS and
+    # SUPERSET_WEBSERVER_DOMAINS for list of domains
+    "ALLOW_DASHBOARD_DOMAIN_SHARDING": True,
     # Experimental feature introducing a client (browser) cache
     "CLIENT_CACHE": False,
     "ENABLE_EXPLORE_JSON_CSRF_PROTECTION": False,