Status:    http.StatusText(http.StatusOK),
		})
	}

	if redirectURL != nil { // success_action_redirect is valid and set.
		v := redirectURL.Query()
		v.Add("bucket", objInfo.Bucket)
		v.Add("key", objInfo.Name)
		v.Add("etag", "\""+objInfo.ETag+"\"")
		redirectURL.RawQuery = v.Encode()
		writeRedirectSeeOther(w, redirectURL.String())
		return
	}

	// Add checksum header.

	}

	// Configure an OpenID Connect aware OAuth2 client.
	oauth2Config := oauth2.Config{
		ClientID:     pro.ClientID,
		ClientSecret: pro.ClientSecret,
		RedirectURL:  pro.RedirectURL,

		// Discovery returns the OAuth2 endpoints.
		Endpoint: provider.Endpoint(),

		// "openid" is a required scope for OpenID Connect flows.
		Scopes: []string{oidc.ScopeOpenID, "groups"},
	}