diff --git a/crates/agent-gateway/internal/protocol/shared/origin.go b/crates/agent-gateway/internal/protocol/shared/origin.go
index e770e62f2..7d00eec22 100644
--- a/crates/agent-gateway/internal/protocol/shared/origin.go
+++ b/crates/agent-gateway/internal/protocol/shared/origin.go
@@ -37,15 +37,10 @@ func requestURLForOriginCheck(r *http.Request) *url.URL {
 	if r == nil {
 		return nil
 	}
-	scheme := strings.TrimSpace(r.Header.Get("X-Forwarded-Proto"))
-	if scheme == "" {
-		if r.TLS != nil {
-			scheme = "https"
-		} else {
-			scheme = "http"
-		}
-	}
-	scheme = strings.ToLower(strings.TrimSpace(strings.Split(scheme, ",")[0]))
+	scheme := "http"
+	if r.TLS != nil {
+		scheme = "https"
+	}
 	switch scheme {
 	case "http", "https":
 	default: