MINOR: mux-h2/htx: Get the start-line from the head when HEADERS frame is built
in the H2 multiplexer, when a HEADERS frame is built before sending it, we have
the warranty the start-line is the head of the HTX message. It is safer to rely
on this fact than on the sl_pos value. For now, it's safe to use sl_pos in muxes
because HTTP 1xx messages are considered as full messages in HTX and only one
HTTP message can be stored at a time in HTX. But we are trying to handle 1xx
messages as a part of the reponse message. In this way, an HTTP reponse will be
the sum of all 1xx informational messages followed by the final response. So it
will be possible to have several start-line in the same HTX message. And the
sl_pos will point to the first unprocessed start-line from the analyzers point
of view.
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