Github user jpeach commented on the pull request: https://github.com/apache/trafficserver/pull/356#issuecomment-160765501 Can you extract the guts of ```validate_hdr_host``` into a separate function and use that to add a regression test host validation? Are you sure that the the return value of ```ats_ip_parse``` really makes sense? It looks like this code depends on it returning a successful status but not parsing any bytes.
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