diff --git a/src/controllers/openid_controller.rs b/src/controllers/openid_controller.rs
index 391ab2c..6e2e5de 100644
--- a/src/controllers/openid_controller.rs
+++ b/src/controllers/openid_controller.rs
@@ -32,6 +32,7 @@ pub async fn get_configuration(req: HttpRequest) -> impl Responder {
     let is_secure_request = req
         .headers()
         .get("HTTP_X_FORWARDED_PROTO")
+        .or_else(|| req.headers().get("X-Forwarded-Proto"))
         .map(|v| v.to_str().unwrap_or_default().to_lowercase().eq("https"))
         .unwrap_or(false);