hamnis/httpcache4j — pull request #9 by hanskr (2012-12-27 09:40:15+00:00)
Title: Avoid "org.apache.http.ProtocolException: Content-Length header already present" exception

If a request already has the Content-Length set, and you use setEntity, it seems like RequestContent.process kicks in and wants to set these headers too, casting an exception.