# Developer Documentation for Apache 2.0

Many of the documents on these Developer pages are lifted from Apache 1.3's documentation. While they are all being updated to Apache 2.0, they are in different stages of progress. Please be patient, and point out any discrepancies or errors on the developer/ pages directly to the dev@httpd.apache.org mailing list.

# Topics

- Apache 1.3 API Notes
- Apache 2.0 Hook Functions
- Request Processing in Apache 2.0
- How filters work in Apache 2.0
- Converting Modules from Apache 1.3 to Apache 2.0
- Debugging Memory Allocation in APR
- Documenting Apache 2.0
- Apache 2.0 Thread Safety Issues

# External Resources

- Tools provided by Ian Holsman:
  - Apache 2 cross reference
  - Autogenerated Apache 2 code documentation
- Module Development Tutorials by Kevin O'Donnell
  - Integrating a module into the Apache build system
  - Handling configuration directives
- Some notes on Apache module development by Ryan Bloom