文件也是：

omn​​iauth.rb：

provider :google_oauth2,'MY_CLIENT_ID.apps.googleusercontent.com','MY_CLIENT_SECRET',:scope => 'https://mail.google.com/mail/Feed/atom/'

Error: redirect_uri_mismatch
The redirect URI in the request: http://localhost:3000/auth/google_oauth2/callback did not match a registered redirect URI

header.html.erb

<li><%= link_to "Sign in with Google","auth/google_oauth2" %></li>

routes.rb中：

match '/auth/:provider/callback',to: 'sessions#omniauth_create'

但我得到这个：

> Error: redirect_uri_mismatch The redirect URI in the request:
> http://localhost:3000/auth/google_oauth2/callback did not match a
> registered redirect URI

(Twitter和Facebook OmniAuth正在完美工作)

不确定是什么问题.有什么建议来解决这个问题？

编辑

我将URI更改为http …：

但仍然有相同的错误.