Make priority of header over body more explicit

Author: Andreas Heider

path_login.go

@@ -100,10 +100,12 @@ func (b *backend) pathLogin(ctx context.Context, req *logical.Request, d *framew
 	// Clean ldap connection
 	defer ldapConnection.Close()
 
-	authorizationString := d.Get("authorization").(string)
+	authorizationString := ""
 	authorizationHeaders := req.Headers["Authorization"]
 	if len(authorizationHeaders) > 0 {
 		authorizationString = authorizationHeaders[0]
+	} else {
+		authorizationString = d.Get("authorization").(string)
 	}
 
 	s := strings.SplitN(authorizationString, " ", 2)