There is number of similar .htaccess questions, but even after lengthy search I haven't been able to find an answer to my problem.
I recon it should be fairly simple, it's just beyond my abilities.
I need to redirect add a parameter to extend search parametr with another - specifically I need this:
www.domain.com/?s=whatever
to become
www.domain.com/?s=whatever&post_type=product
each and every time, but obviously only when s parameter is present and post_type parameter is not.
Doing this the right way (managing the parameters at input) is unfortunately impossible in this case, that's why I want to bypass this with .htaccess.
Thanks a lot for your help!