# Developer Documentation for the Apache HTTP Server 2.4

# Warning

Many of the documents listed here are in need of update. 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.

# 2.4 development documents

- Developing modules for the Apache HTTP Server 2.4
- Hook Functions in 2.4
- Request Processing in 2.4
- How filters work in 2.4
- Guidelines for output filters in 2.4
- Documenting code in 2.4
- Thread Safety Issues in 2.4

# Upgrading to 2.4

- API changes in 2.3/2.4
- Converting Modules from 1.3 to 2.x

# External Resources

- Autogenerated Apache HTTP Server (trunk) code documentation
- Developer articles at apachetutor include:
  - Request Processing
  - Configuration for Modules
  - Resource Management
  - Connection Pooling
  - Introduction to Buckets and Brigades