javax.servlet API covers most of the basic features that any servlet needs. It is protocol-independent, allowing for future expansion into new protocols such as the Wireless Application Protocol (WAP). The HTTP-specific servlet features are provided by a separate
Most of the commonly used items in this API are defined as interfaces and not as concrete classes. Each servlet engine has the flexibility to implement these interfaces as it sees fit.
interface is the entryway for calling another servlet, JSP or other Web resource, either by inclusion or by ...