On Oct 8, 2013, at 1:25 PM, Yann Ylavic <ylavic....@gmail.com> wrote:

> Helo,
> 
> in the case where a ping is configured in a worker to check backend's 
> connection (re)usability, ap_proxy_create_hdrbrgd will force r->expecting_100 
> (r1516930).
> 
> As I understand it, r->expecting_100 relates to the client's connection, and 
> is used by ap_http_filter to deal with client's 100-continue expectation, or 
> by ap_send_interim_response to check whether the client expects one (or do 
> nothing).
> 
> Hence why is ap_proxy_create_hdrbrgd setting r->expecting_100 for the purpose 
> of the backend connection?
> 

because we are forcing the 100-continue on that request.
See ap_proxy_http_process_response()

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