libecap3-dev - 1.0.1-3.4+b1 main

eCAP is a software interface that allows a network application,
such as an HTTP proxy or an ICAP server, to outsource content
analysis and adaptation to a loadable module. For each applicable
protocol message being processed, an eCAP-enabled host application
supplies the message details to the adaptation module and gets
back an adapted message, a "not interested" response, or a "block
this message now!" instruction. These exchanges often include
message bodies.