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https://issues.apache.org/jira/browse/TS-3693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14615578#comment-14615578
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Sudheer Vinukonda commented on TS-3693:
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Well, that does not sound like a justification for making it (much) worse. IMO, 
we should at least ensure that the proxy *validates* the request before sending 
a "100 CONT". It seems pretty odd to me that the proxy would send a "100 CONT" 
followed by "400 Bad Request", "403, Forbidden" or "404, Not Found on 
Accelerator" etc.

> Move 100-continue logic to read client header for intercept plugins
> -------------------------------------------------------------------
>
>                 Key: TS-3693
>                 URL: https://issues.apache.org/jira/browse/TS-3693
>             Project: Traffic Server
>          Issue Type: Improvement
>          Components: HTTP
>            Reporter: Bryan Call
>            Assignee: Bryan Call
>              Labels: yahoo
>             Fix For: 6.1.0
>
>
> From https://github.com/apache/trafficserver/pull/216 :
> Currently, ATS handles "Expect: 100-continue" header in 
> HttpSM::state_send_server_request_header. In intercept plugin case, ATS may 
> have no chance to run into this logic, it handles the header in a later point 
> - HttpSM::state_send_server_request_header. I did not take this into account 
> when I wrote the first patch. Now we have an intercept plugin use case in 
> yahoo, and I think we need to move the handle logic some earlier, right after 
> finish parsing the client request header.



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