BUG/MEDIUM: http-ana: Don't eval http-after-response ruleset on empty messages

It is not possible on response comming from a server, but an errorfile may be
empty. In this case, the http-after-response ruleset must not be evaluated
because it is totally unexpected to manipulate headers on an empty HTX message.

This patch must be backported everywhere the http-after-response rules are
supported, i.e as far as 2.2.

(cherry picked from commit aab1b67383993b93bd70144825bc4350e3986a10)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>

diff --git a/src/http_ana.c b/src/http_ana.c
index 5f81b08..deec220 100644 (file)
--- a/src/http_ana.c
+++ b/src/http_ana.c
@@ -4524,7 +4524,7 @@ int http_forward_proxy_resp(struct stream *s, int final)
        if (final) {
                htx->flags |= HTX_FL_PROXY_RESP;
 
-               if (!http_eval_after_res_rules(s))
+               if (!htx_is_empty(htx) && !http_eval_after_res_rules(s))
                        return 0;
 
                if (s->txn->meth == HTTP_METH_HEAD)