Hi

FROM CONTROLLER

if you déclare thé controller with:

def my_route(self, named_param, **kw)

     print named_param

     print kw.get('another_param')

And browse it with:

my_website/my_route?named_param=foo&another_param=bar

will output:

    foo

    bar

FROM QWEB

<t t-esc="request.params.get('another_param')" />

You can find more détails un the documentation: 

https://www.odoo.com/documentation/10.0/reference/http.html