From: Christopher Faulet <cfaulet@haproxy.com>
Date: Tue, 8 Jul 2025 06:38:31 +0000 (+0200)
Subject: BUG/MINOR: http-client: Ignore 1XX interim responses in non-HTX mode
X-Git-Tag: v3.3-dev3~11
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=9d10be33aebb08058c37d7dcd15874e42be74a29;p=thirdparty%2Fhaproxy.git

BUG/MINOR: http-client: Ignore 1XX interim responses in non-HTX mode

When the response is re-formatted in raw message, the 1XX interim responses
must be skipped. Otherwise, information of the first interim response will
be saved (status line and headers) and those from the final response will be
dropped.

Note that for now, in HTX-mode, the interim messages are removed.

This patch must be backported as far as 2.6.
---

diff --git a/src/http_client.c b/src/http_client.c
index 809e437d5..a43022c90 100644
--- a/src/http_client.c
+++ b/src/http_client.c
@@ -648,6 +648,23 @@ void httpclient_applet_io_handler(struct appctx *appctx)
 				if (!sl || (!(sl->flags & HTX_SL_F_IS_RESP)))
 					goto out;
 
+				/* Skipp any 1XX interim responses */
+				if (sl->info.res.status < 200 &&
+				    (sl->info.res.status == 100 || sl->info.res.status >= 102)) {
+					while (blk) {
+						enum htx_blk_type type = htx_get_blk_type(blk);
+						uint32_t sz = htx_get_blksz(blk);
+
+						c_rew(res, sz);
+						blk = htx_remove_blk(htx, blk);
+						if (type == HTX_BLK_EOH) {
+							htx_to_buf(htx, &res->buf);
+							break;
+						}
+					}
+					break;
+				}
+
 				/* copy the status line in the httpclient */
 				hc->res.status = sl->info.res.status;
 				hc->res.vsn = istdup(htx_sl_res_vsn(sl));