diff --git a/include/types/http_ana.h b/include/types/http_ana.h
index a352a9919..5a7ced7b0 100644
--- a/include/types/http_ana.h
+++ b/include/types/http_ana.h
@@ -175,6 +175,7 @@ struct http_txn {
 	enum http_meth_t meth;          /* HTTP method */
 	/* 1 unused byte here */
 	short status;                   /* HTTP status from the server, negative if from proxy */
+	struct buffer *errmsg;          /* custom HTTP error message to use as reply */
 
 	char cache_hash[20];               /* Store the cache hash  */
 	char *uri;                      /* first line if log needed, NULL otherwise */
diff --git a/src/http_ana.c b/src/http_ana.c
index 574f6eb01..10ee24111 100644
--- a/src/http_ana.c
+++ b/src/http_ana.c
@@ -4597,7 +4597,9 @@ struct buffer *http_error_message(struct stream *s)
 {
 	const int msgnum = http_get_status_idx(s->txn->status);
 
-	if (s->be->errmsg[msgnum])
+	if (s->txn && s->txn->errmsg)
+		return s->txn->errmsg;
+	else if (s->be->errmsg[msgnum])
 		return s->be->errmsg[msgnum];
 	else if (strm_fe(s)->errmsg[msgnum])
 		return strm_fe(s)->errmsg[msgnum];
@@ -5024,6 +5026,7 @@ void http_init_txn(struct stream *s)
 		      ? (TX_NOT_FIRST|TX_WAIT_NEXT_RQ)
 		      : 0);
 	txn->status = -1;
+	txn->errmsg = NULL;
 	*(unsigned int *)txn->cache_hash = 0;
 
 	txn->cookie_first_date = 0;