Github user ffcai commented on the pull request:
https://github.com/apache/trafficserver/pull/216#issuecomment-111380014
@sudheerv , as discussed some earlier, in transaction interception case,
ATS would not have chance to handle the *"Expect: 100-continue"* header. Our
sherpa plugin intercepts in the *TS_HTTP_READ_REQUEST_HDR_HOOK* point, whereas
ATS handles "Expect" header in *HttpSM::state_send_server_request_header* call
(old patch), which would not have chance to execute in interception case.
*HttpTransact::HandleRequest* is called after *RemapRequest*, which is a
later point of *TS_HTTP_READ_REQUEST_HDR_HOOK*. I think here we have to send
the 100 continue response in *HttpSM::state_read_client_request_header*.
https://trafficserver.readthedocs.org/en/latest/sdk/http-hooks-and-transactions.en.html#http-txn-state-diagram
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