Filtered/Layered I/O in Apache 2

• We want to be able to let one module modify the data that was generated by an earlier module
• Example: CGI scripts that output SSI tags
• Marked for inclusion in 2.1 or 3.0
• The Group decided in July 2000 to include this in 2.0
• Input Filter: Data sent by clients to server
• Output Filter: Data sent by the server to the client