What are servlet capabilities?

am new to servlets, am just wondering if a servlet supports all the following:
- query string keys.
- form post keys.
- cookies.
- session management.
- server side caching (accessible object among all requests) .
- returning a binary file (attachment).
- and all other standard features in any server side scripting language.
regarding the server caching, is it possible to set an age (timeout) for the cache?

BalusC wrote:
JoachimSauer wrote:
gimbal2 wrote:
a servlet can do whatever HTTP can do and any servlet engine can handle sessions. So that is yes to all items.Slightly off-topic: Has anyone ever seen a non-HTTP Servlet?
Because the existence of javax.servlet.Servlet and javax.servlet.http.HttpServlet seems to imply that there was at some point the idea that Servlets for other protocols would be possible/useful. Has anyone seen a javax.servlet.Servlet that was not a javax.servlet.http.HttpServlet?Portlets.i've heard of people extending Servlet to create an FtpServlet, but i've never seen the source or deployment.
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