If you want to use href instead of link to. It's equivalent link_to in Rails. And if you want to use method you must use data-method in a tag

link_to.html.erb

<a data-method="delete" href="<%= destroy_user_session_path %>">
  <i class="fa fa-sign-out" aria-hidden="true"></i><span class="hidden-xs hidden-sm">Exit</span>
</a>
<!--
  user signout with devise. That's equivalent to <%= link_to('Exit', destroy_user_session_path, method: :delete) %>
-->