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Article:
  Two Servlet Filters Every Web Application Should Have
Subject:   Bufffering
Date:   2003-12-18 21:31:24
From:   jfalkner
Response to: Bufffering

Buffering the content allows for the filter to correctly set the "Content-Length" HTTP header. When you compress content you almost always end up sending fewer bytes of information, meaning you need to modify this header.