Limited HTTP API

[Laura Morales]

I'd like to make one of my SPARQL endpoints publicly accessible through a REST 
API. The problem however, is that SPARQL is a very expressive language, and 
it's too easy to abuse it with complex, unoptimized queries.
I'm wondering if there's any "filter" that can be applied on the HTTP request 
in order to limit what the user can do; for example "allow nodes traversal 
only" or "return MAX results at most" etc.