diff --git a/src/data/config_flow.ts b/src/data/config_flow.ts
index 0752659abc..d322f16ec9 100644
--- a/src/data/config_flow.ts
+++ b/src/data/config_flow.ts
@@ -16,16 +16,27 @@ export const DISCOVERY_SOURCES = [
 
 export const ATTENTION_SOURCES = ["reauth"];
 
+const HEADERS = {
+  "HA-Frontend-Base": `${location.protocol}//${location.host}`,
+};
+
 export const createConfigFlow = (hass: HomeAssistant, handler: string) =>
-  hass.callApi<DataEntryFlowStep>("POST", "config/config_entries/flow", {
-    handler,
-    show_advanced_options: Boolean(hass.userData?.showAdvanced),
-  });
+  hass.callApi<DataEntryFlowStep>(
+    "POST",
+    "config/config_entries/flow",
+    {
+      handler,
+      show_advanced_options: Boolean(hass.userData?.showAdvanced),
+    },
+    HEADERS
+  );
 
 export const fetchConfigFlow = (hass: HomeAssistant, flowId: string) =>
   hass.callApi<DataEntryFlowStep>(
     "GET",
-    `config/config_entries/flow/${flowId}`
+    `config/config_entries/flow/${flowId}`,
+    undefined,
+    HEADERS
   );
 
 export const handleConfigFlowStep = (
@@ -36,7 +47,8 @@ export const handleConfigFlowStep = (
   hass.callApi<DataEntryFlowStep>(
     "POST",
     `config/config_entries/flow/${flowId}`,
-    data
+    data,
+    HEADERS
   );
 
 export const ignoreConfigFlow = (hass: HomeAssistant, flowId: string) =>
diff --git a/src/state/connection-mixin.ts b/src/state/connection-mixin.ts
index 9862ed3bb3..895b6427db 100644
--- a/src/state/connection-mixin.ts
+++ b/src/state/connection-mixin.ts
@@ -85,8 +85,8 @@ export const connectionMixin = <T extends Constructor<HassBaseEl>>(
             throw err;
           }
         },
-        callApi: async (method, path, parameters) =>
-          hassCallApi(auth, method, path, parameters),
+        callApi: async (method, path, parameters, headers) =>
+          hassCallApi(auth, method, path, parameters, headers),
         fetchWithAuth: (
           path: string,
           init: Parameters<typeof fetchWithAuth>[2]
diff --git a/src/types.ts b/src/types.ts
index a16a66f31e..b375183b85 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -248,7 +248,8 @@ export interface HomeAssistant {
   callApi<T>(
     method: "GET" | "POST" | "PUT" | "DELETE",
     path: string,
-    parameters?: Record<string, any>
+    parameters?: Record<string, any>,
+    headers?: Record<string, string>
   ): Promise<T>;
   fetchWithAuth(path: string, init?: Record<string, any>): Promise<Response>;
   sendWS(msg: MessageBase): void;
diff --git a/src/util/hass-call-api.ts b/src/util/hass-call-api.ts
index cc85783cc7..adf8d9eff3 100644
--- a/src/util/hass-call-api.ts
+++ b/src/util/hass-call-api.ts
@@ -52,13 +52,14 @@ export default async function hassCallApi<T>(
   auth: Auth,
   method: string,
   path: string,
-  parameters?: Record<string, unknown>
+  parameters?: Record<string, unknown>,
+  headers?: Record<string, string>
 ) {
   const url = `${auth.data.hassUrl}/api/${path}`;
 
   const init: RequestInit = {
     method,
-    headers: {},
+    headers: headers || {},
   };
 
   if (parameters) {