diff --git a/router/middleware/auth.go b/router/middleware/auth.go
index 00e8dfc60..574610cdf 100644
--- a/router/middleware/auth.go
+++ b/router/middleware/auth.go
@@ -69,10 +69,13 @@ func RequireExternalAPIAccessToken(scope string, handler ExternalAccessTokenHand
 			return
 		}
 
-		authHeader := strings.Split(r.Header.Get("Authorization"), "Bearer ")
-		token := strings.Join(authHeader, "")
+		authHeader := r.Header.Get("Authorization")
+		token := ""
+		if strings.HasPrefix(strings.ToLower(authHeader), "bearer ") {
+			token = authHeader[len("bearer "):]
+		}
 
-		if len(authHeader) == 0 || token == "" {
+		if token == "" {
 			log.Warnln("invalid access token")
 			accessDenied(w)
 			return
diff --git a/test/automated/api/integrations.test.js b/test/automated/api/integrations.test.js
index 4b1ab345b..17914625e 100644
--- a/test/automated/api/integrations.test.js
+++ b/test/automated/api/integrations.test.js
@@ -83,7 +83,7 @@ test('send a system message using access token', async (done) => {
 	};
 	const res = await request
 		.post('/api/integrations/chat/system')
-		.set('Authorization', 'Bearer ' + accessToken)
+		.set('Authorization', 'bearer ' + accessToken)
 		.send(payload)
 		.expect(200);
 	done();