When apache developers first introduce Apache 2.0, there is one major concern goals that is one mudules able to modify the output of another. And the mechanism to do modifications are called filter. In the early stage it is hard for developers to write a filter, but now after developer has improved the interface of Apache, it makes things easier and possible.
Arcodding to Apache 2.0 Basics by Ryan Bloom. In Apache filter terminology, each chunk is stored in a bucket, and lists of buckets form brigades. Lists of brigades can then create a Web document. Filters operate on one brigade at a time, and are called upon repeatedly until the entire document has been processed. This allows the server to stream information to the client.
References:
1. Apache Filter
http://www.projectcomputing.com/resources/apacheFilterFAQ/#con-what
2. Writing filter for Apache 2.0
http://www.onlamp.com/pub/a/apache/2001/08/23/apache_2.html
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