Why no HttpServletReq on doFilter?

[Max Tomlinson]

Seems odd (to me anyway) that doFilter would not take HttpServletRequest as input...aren't most filters going to apply to Http?
--->public void doFilter(
ServletRequest req,
ServletResponse resp,
FilterChain chain)
throws ServletException, IOException {

So if, for example, to get pathInfo, I have test for instanceof HttpServletRequest, then cast to it, just to get some basic info.
Or am I missing something?
thanks,
max

[Steve Leach]

Filters aren't Http specific. If you *know* that you are only going to get HttpServletRequests (which is reasonable) then you are safe to cast without checking.

[Max Tomlinson]

OK, thanks.
Where would I want to use a non-http filter?
Max