The request object breaks down the request URL into components. Servlets and JSP pages can use those components to vary the response while using the same servlet or JSP page.

A basic JSP file which displays the values of the JSP environment.

Using forms to get information from the user

Multipart forms let browsers upload files to the website. They also have better handling for internationalization.

Each browser request sends headers along with the URL. Sophisticated servlets can use browser headers to tailor the returned page to the browser.