Major Description
Observed symptom described at http://mail-archives.apache.org/mod_mbox/trafficserver-dev/201304.mbox/browser
TSHttpHdrPrint fails with header buffer in excess of 4k.
Specifically, when the do { } loop at lines 3603-3617 of InkAPI.cc executes more than once, data read in all but the last iteration are lost.
Diagnosis: MIOBuffer::fill is trashing the buffer by moving _writer to the last buffer in the list!