Oauth 2.0 无法获取访问令牌google drive sdk

我想在我的应用程序中使用GoogleDriveAPI，这就是为什么我在安装的应用程序中使用OAuth2.0。但我有一个问题-我无法获得访问令牌。首先，我使用以下请求成功获取授权代码：

  https://accounts.google.com/o/oauth2/auth?
  scope=https://www.googleapis.com/auth/drive.file&
  redirect_uri=[my redirect_uri from from Developers Console]&
  response_type=code&
  client_id=[My client ID for native application from Developers Console]

   POST /o/oauth2/token HTTP/1.1
   Host: accounts.google.com
   Content-Type: application/x-www-form-urlencoded

   code={My uthorization code}&
   client_id=[My client Id]&
   client_secret=[My clien secret]&
   redirect_uri=[my redirect_uri from from Developers Console]&
   grant_type=authorization_code

然后，我尝试使用收到的授权码，通过以下请求获取访问令牌：

  https://accounts.google.com/o/oauth2/auth?
  scope=https://www.googleapis.com/auth/drive.file&
  redirect_uri=[my redirect_uri from from Developers Console]&
  response_type=code&
  client_id=[My client ID for native application from Developers Console]

   POST /o/oauth2/token HTTP/1.1
   Host: accounts.google.com
   Content-Type: application/x-www-form-urlencoded

   code={My uthorization code}&
   client_id=[My client Id]&
   client_secret=[My clien secret]&
   redirect_uri=[my redirect_uri from from Developers Console]&
   grant_type=authorization_code

服务器始终返回400。你能告诉我有什么问题吗

跟踪http请求 去OAuth2游乐场做同样的事情 找出区别 可能是您没有对参数进行URL编码