URL pattern for custom components

Lets say my application name is

simple_app

, whenever i switch to a custom component by setting the window content how can i change the url pattern name:

I have two components

main

and a

login

, when the user first visits my application, i want the url to look like this

http://localhost:8080/simple_app/login

then after logging in, i want the url to look like this

http://localhost:8080/simple_app/main

and this should go on for each tab, action and component i set?

is this possible, my web.xml has a /* vaadin pattern that stays at the same url name

Browsers have some limitation on how you can change the URL in a smooth way.
For Vaadin the easiest is to use fragments

There is a discussion of why you need the # in the URL in this forum post