diff --git a/backend/internal/http/router/router.go b/backend/internal/http/router/router.go
index 0b74c8c0b..30263dbcf 100644
--- a/backend/internal/http/router/router.go
+++ b/backend/internal/http/router/router.go
@@ -119,7 +119,7 @@ func (e *Router) corsMiddleware(next http.Handler) http.Handler {
 		// Prepare headers for preflight requests
 		w.Header().Set("Access-Control-Allow-Origin", "*")
 		w.Header().Set("Access-Control-Allow-Methods", "POST")
-		w.Header().Set("Access-Control-Allow-Headers", "Content-Type,Authorization")
+		w.Header().Set("Access-Control-Allow-Headers", "Content-Type,Authorization,Content-Encoding")
 		if r.Method == http.MethodOptions {
 			w.Header().Set("Cache-Control", "max-age=86400")
 			w.WriteHeader(http.StatusOK)