The com.oreilly.servlet package is the "must have" class library for servlet developers. There are classes to help servlets parse parameters, handle file uploads, generate multipart responses (server push), negotiate locales for internationalization, return files, manage socket connections, and act as RMI servers, as well as a class to help applets communicate with servlets. Since the first edition, there are also new classes to help servlets send email messages, cache responses, and auto-detect servlet API support.