Overview of New Features in Apache 2.0

Enhancements: Core |

Core Enhancements:

Unix Threading: On Unix systems with POSIX threads support, Apache can now run in a hybrid multiprocess, multithreaded mode. This should improve scalability.
New Build System: The build system has been rewritten from scratch to be based on autoconf and libtool. This makes Apache's configuration system more similar to that of other packages.
Multiprotocol Support: Apache now has some of the infrastructure in place to support serving multiple protocols. mod_echo has been written as an example.
Better support for non-Unix platforms: Apache 2.0 should be faster and more stable on non-Unix platforms such as BeOS, OS/2, and Windows. With the introduction of platform-specific multiprocessing modules (MPM) and the Apache Portable Runtime, these platforms can now avoid using POSIX-emulation functions that are sometimes buggy and always hurt performance.; A list of the MPM's currently available is here.
New API: The API for modules has changed significantly for 2.0. Many of the module-ordering problems from 1.3 should be gone. 2.0 does much of this automatically, and module ordering is now done per-hook to allow more flexibility. Also, new calls have been added that should allow modules to do more without requiring patching of the core Apache server.

Apache HTTP Server