Usage and Implementation of Head, Option, Trace http methods with Servlet

I want to implement following methods to understand their working by using Servlet.

doHead()  
doTrace()  
doHead()  
doOption()

The syntax and theoretical meaning is given in every tutorial and documentation but I didn't find their actual use and implementation.

Can u plz help me out with scenarios in which we use these methods and actual implementation code.

I tried to call these function from html form and implemented respective method but it is not working.

<form action="trace" method="trace">
<input type="submit">
</form>
<form action="trace" method="option">
<input type="submit">
</form>