Github user ykopel commented on the issue:
https://github.com/apache/trafficserver/pull/1472
I tested it in my env. And I see it is grater than zero.
There are several lines before it that assume that "read_avail" is grater
than zero:
```
// Reset the inactivity timeout if this is the first
// time we've been called. The timeout had been set to
// the accept timeout by the ProxyClientTransaction
//
if ((ua_buffer_reader->read_avail() > 0) && (client_request_hdr_bytes ==
0)) {
milestones[TS_MILESTONE_UA_FIRST_READ] = Thread::get_hrtime();
ua_session->set_inactivity_timeout(HRTIME_SECONDS(t_state.txn_conf->transaction_no_activity_timeout_in));
}
```
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