diff --git a/requests.go b/requests.go
index 511e890..3753a75 100644
--- a/requests.go
+++ b/requests.go
@@ -43,10 +43,15 @@ func (c *Client) req(method, path string, body io.Reader, intercept func(*http.R
 	}
 
 	if rs.StatusCode == 401 && c.auth.Type() == "NoAuth" {
-		if strings.Index(rs.Header.Get("Www-Authenticate"), "Digest") > -1 {
+
+		wwwAuthenticateHeader := strings.ToLower(rs.Header.Get("Www-Authenticate"))
+
+		if strings.Index(wwwAuthenticateHeader, "digest") > -1 {
 			c.auth = &DigestAuth{c.auth.User(), c.auth.Pass(), digestParts(rs)}
-		} else if strings.Index(rs.Header.Get("Www-Authenticate"), "Basic") > -1 {
+
+		} else if strings.Index(wwwAuthenticateHeader, "basic") > -1 {
 			c.auth = &BasicAuth{c.auth.User(), c.auth.Pass()}
+
 		} else {
 			return rs, newPathError("Authorize", c.root, rs.StatusCode)
 		}