Github user jacksontj commented on the issue:
https://github.com/apache/trafficserver/pull/773
@jpeach
I did some testing of my own and I can't reproduce any problems with
`TsHttpTxnServerAddrSet()` at all. TSHttpTxnServerAddrSet() is supposed to be
called before the DNS lookup. If called then the core bypasses the entire
OS_DNS stuff which includes this port setting block in HttpTransact.
I tested calling the API on both the `TS_EVENT_HTTP_READ_REQUEST_HDR` and
`TS_EVENT_HTTP_OS_DNS` hooks-- with no problem at all.
You mentioned in a previous comment that it was broken in your testing, can
you share the code you were using to see it broken?
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