From fb7d7b008e6841cfd6d526cdb8e8cf9cabd40204 Mon Sep 17 00:00:00 2001
From: aler9 <46489434+aler9@users.noreply.github.com>
Date: Fri, 10 Jul 2020 11:13:24 +0200
Subject: [PATCH] clearer error message

---
 auth.go | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/auth.go b/auth.go
index d808ee6b..046f288d 100644
--- a/auth.go
+++ b/auth.go
@@ -83,8 +83,11 @@ func (as *AuthServer) GenerateHeader() []string {
 // ValidateHeader validates the Authorization header sent by a client after receiving the
 // WWW-Authenticate header provided by GenerateHeader().
 func (as *AuthServer) ValidateHeader(header []string, method Method, ur *url.URL) error {
-	if len(header) != 1 {
-		return fmt.Errorf("authorization header not provided or provided multiple times")
+	if len(header) == 0 {
+		return fmt.Errorf("authorization header not provided")
+	}
+	if len(header) > 1 {
+		return fmt.Errorf("authorization header provided multiple times")
 	}
 
 	head := header[0]