diff --git a/src/mux_h2.c b/src/mux_h2.c
index 8b670df64..76c9b0805 100644
--- a/src/mux_h2.c
+++ b/src/mux_h2.c
@@ -521,6 +521,8 @@ struct task *h2_deferred_shut(struct task *t, void *ctx, unsigned int state);
 static struct h2s *h2c_bck_stream_new(struct h2c *h2c, struct stconn *sc, struct session *sess);
 static void h2s_alert(struct h2s *h2s);
 static inline void h2_remove_from_list(struct h2s *h2s);
+static int h2_dump_h2c_info(struct buffer *msg, struct h2c *h2c, const char *pfx);
+static int h2_dump_h2s_info(struct buffer *msg, const struct h2s *h2s, const char *pfx);
 
 /* returns the stconn associated to the H2 stream */
 static forceinline struct stconn *h2s_sc(const struct h2s *h2s)
@@ -4743,12 +4745,30 @@ static int h2_sctl(struct stconn *sc, enum mux_sctl_type mux_sctl, void *output)
 {
 	int ret = 0;
 	struct h2s *h2s = __sc_mux_strm(sc);
+	union mux_sctl_dbg_str_ctx *dbg_ctx;
+	struct buffer *buf;
 
 	switch (mux_sctl) {
 	case MUX_SCTL_SID:
 		if (output)
 			*((int64_t *)output) = h2s->id;
 		return ret;
+	case MUX_SCTL_DBG_STR:
+		dbg_ctx = output;
+		buf = get_trash_chunk();
+
+		if (dbg_ctx->arg.debug_flags & MUX_SCTL_DBG_STR_L_MUXS)
+			h2_dump_h2s_info(buf, h2s, NULL);
+
+		if (dbg_ctx->arg.debug_flags & MUX_SCTL_DBG_STR_L_MUXC)
+			h2_dump_h2c_info(buf, h2s->h2c, NULL);
+
+		if (dbg_ctx->arg.debug_flags & MUX_SCTL_DBG_STR_L_CONN)
+			chunk_appendf(buf, " conn.flg=%#08x", h2s->h2c->conn->flags);
+
+		/* other layers not implemented */
+		dbg_ctx->ret.buf = *buf;
+		return ret;
 
 	default:
 		return -1;