commit 5a8549e68225070d0b79cbbb9c5f791e103685e7
Author: Christopher Faulet <cfaulet@haproxy.com>
Date:   Mon Jun 17 13:36:06 2019 +0200

    BUG/MINOR: lua/htx: Make txn.req_req_* and txn.res_rep_* HTX aware
    
    These bindings were not updated to support HTX streams.
    
    This patch must be backported to 2.0 and 1.9. It fixes the issue #124.
    
    (cherry picked from commit ea418748dd22331e9798cfd8f5e25b436cd577e3)
    Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>

diff --git a/src/hlua.c b/src/hlua.c
index 28abd083..32f0e8db 100644
--- a/src/hlua.c
+++ b/src/hlua.c
@@ -5375,7 +5375,13 @@ __LJMP static inline int hlua_http_rep_hdr(lua_State *L, struct hlua_txn *htxn,
 	if (!(re = regex_comp(reg, 1, 1, NULL)))
 		WILL_LJMP(luaL_argerror(L, 3, "invalid regex"));
 
-	http_transform_header_str(htxn->s, msg, name, name_len, value, re, action);
+	if (IS_HTX_STRM(htxn->s)) {
+		struct htx *htx = htxbuf(&msg->chn->buf);
+
+		htx_transform_header_str(htxn->s, msg->chn, htx, ist2(name, name_len), value, re, action);
+	}
+	else
+		http_transform_header_str(htxn->s, msg, name, name_len, value, re, action);
 	regex_free(re);
 	return 0;
 }