From: <glassfish_at_javadesktop.org>
Date: Tue, 01 Dec 2009 17:38:50 PST

I ran into "Invalid Chunk Header" error too when I post chunked data. In my case, the error was caused by uploadTimeout, whose default value is 30 seconds (30000 milliseconds). I fixed it by extending uploadTimeout. You might need to call "setDisableUploadTimeout(false)" to enable changing default uploadTimeout.
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http://forums.java.net/jive/thread.jspa?messageID=374203