From 5bca51d9198ef844720f2c7fa4663e90dc04a335 Mon Sep 17 00:00:00 2001
From: takashi uesaka <uesaka@nextscape.net>
Date: Fri, 31 Jul 2015 15:34:57 +0900
Subject: [PATCH] BugFix. Clear authorization header before request access
 token. Backlog OAuth Provider check the old token in authorization header and
 return 400 error.

---
 Owin.Security.Providers/Backlog/BacklogAuthenticationHandler.cs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Owin.Security.Providers/Backlog/BacklogAuthenticationHandler.cs b/Owin.Security.Providers/Backlog/BacklogAuthenticationHandler.cs
index 60c784e..07f91c3 100644
--- a/Owin.Security.Providers/Backlog/BacklogAuthenticationHandler.cs
+++ b/Owin.Security.Providers/Backlog/BacklogAuthenticationHandler.cs
@@ -72,6 +72,7 @@ namespace Owin.Security.Providers.Backlog
                 body.Add(new KeyValuePair<string, string>("client_secret", Options.ClientSecret));
 
                 // Get token
+                httpClient.DefaultRequestHeaders.Authorization = null;
                 HttpResponseMessage tokenResponse =
                     await httpClient.PostAsync(Options.TokenEndpoint, new FormUrlEncodedContent(body));
                 tokenResponse.EnsureSuccessStatusCode();