BUG/MEDIUM: mux-h1: Add C-L header in outgoing message if it was removed
If a C-L header was found during parsing of a message but it was removed via
a HTTP action, it is re-added during the message formatting. Indeed, if
headers about the payload are modified, meta-data of the message must also
be updated. Otherwise, it is not possible to guarantee the message will be
properly formatted.
To do so, we rely on the flag H1S_F_HAVE_CLEN.
This patch should not be backported except an issue is explicitly
reported. It relies on "MINOR: mux-h1: Add flags if outgoing msg contains a
header about its payload".