Workaround for JWT::ExpiredSignature exception with warden-jwt_auth

sessions_controller.rb

# app/controllers/users/sessions_controller.rb
class Users::SessionsController < Devise::SessionsController
  ...
  def destroy
    remove_authorization_header! unless current_user
    sign_out(resource_name)
  end
  ...
  private
  ...
  def remove_authorization_header!
    request.env.delete('HTTP_AUTHORIZATION')
  end
  ...
end