diff --git a/token-validator/main.go b/token-validator/main.go
index b846184..4f8093e 100644
--- a/token-validator/main.go
+++ b/token-validator/main.go
@@ -27,7 +27,7 @@ func (r ResponseWriterPrefix) Header() http.Header {
 }
 
 func (r ResponseWriterPrefix) WriteHeader(s int) {
-	if v, exists := r.real.Header()["Location"]; exists {
+	if v, exists := r.real.Header()["Location"]; exists && len(v) > 0 && !strings.HasPrefix(v[0], "https://") && !strings.HasPrefix(v[0], "http://") {
 		r.real.Header().Set("Location", r.prefix+v[0])
 	}
 	r.real.WriteHeader(s)