title: AccountChooser URL is randomly changed with Google OpenID Connect
body: <p>We are developing a web application with Google OpenID Connect Single Sign-On and currently having trouble in google authentication.</p>
  <p>Every time we access the application login page, the URL of google account chooser is randomly changed.
  Sometimes it goes to <code>https://accounts.google.com/signin/oauth?response_type=code&amp;client_id=...</code> which is what we expects, sometimes goes to <code>https://accounts.google.com/AccountChooser?oauth=1&amp;continue=...</code> that results in <code>400. That’s an error. The server cannot process the request because it is malformed. It should not be retried. That’s all we know.</code> shown in google error page.</p>
  <p>We follow <a href="https://developers.google.com/identity/protocols/oauth2/openid-connect" rel="nofollow noreferrer">https://developers.google.com/identity/protocols/oauth2/openid-connect</a> to implement OAuth 2.0 authorization code flow.
  Here are some of parameters we specified in auth request.</p>
  <pre><code>response_type: &quot;code&quot;
  scope: &quot;openid email&quot;
  openid.realm: App URL
  redirect_uri: App callback URL
  nonce: Not set
  </code></pre>
  <p>Any help would be greatly appreciated.
  Thank you.</p>