modperl 2, the next generation of the Apache Perl module, gives you full access to the Apache 2 internals via the Perl programming language, just as modperl 1 gave you access to Apache 1. New features in Apache and Perl make modperl 2 even more powerful and useful than before, allowing you to quickly write and deploy fast, robust web applications. As with any major upgrade, there are new features and key changes to modperl from the 1.x generation. The modperl 2 User's Guide explains these key changes and demonstrates the tools you can use to port modules and migrate your existing code. Improvements in Apache 2 and modperl 2 include: * Multi-Processing Model modules (MPMs) allow for process-based and thread-based processing models. The addition of thread support makes modperl viable on Win32 and introduces the potential for improved performance on other platforms. * Protocol Modules give Apache and modperl the potential to serve any protocol, not just HTTP. * A mod_perl 2 interface to the Apache filtering API gives full access to input and output filters from Perl. * Support for creating custom Apache configuration directives in pure Perl, improved options for passing values to Perl modules from Apache, and greater access to the Apache configuration values. * The Apache::Test framework, useful for Perl and non-Perl Apache modules, allows you to develop fully-tested web applications to verify features and guard against regression. * The ability to easily subclass