How to determine which page the user is on in beego?

Question

go

Hello.
The task is to determine which page the user is on and, in accordance with this, emphasize the menu item.
There are index.tpl and index2.tpl, header and footer are placed in separate files (header.tpl, footer.tpl).
I connected it to the index like this:
{{template "header.tpl"}}
{{template "footer.tpl"}}
Since there will be a lot of pages, changing the menu class in each page is cumbersome.
Menu example:

<ul>
 <li><a class="active" href="/">1</a></li>
          <li><a href="#">2</a></li>
          <li><a href="#">3</a></li>
          <li><a href="#">4</a></li>
</ul>

You need to determine which page the user is on and assign the menu class "active".
Thanks in advance :3