Trailing slash and links

Hi

if the url is 

Code:

localhost/controller/method/
<a href="some_link">link</a> -> it points to localhost/controller/method/some_link

But if there is no slash

Code:

localhost/controller/method
<a href="some_link">link</a> -> it points to localhost/controller/some_link (method is not included here)

How can i fix this. I want the link to include method name.
Thanks