From 05ca65c65012f9d08f190ac262b587e4b889e3ad Mon Sep 17 00:00:00 2001
From: Stefan Eissing <stefan@eissing.org>
Date: Tue, 5 Aug 2025 14:04:35 +0200
Subject: [PATCH] also set `conn->httpversion_seen` when switching to HTTP/2
 without ALPN because of PRIOR_KNOWLEDGE configuration.

---
 lib/http.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/http.c b/lib/http.c
index 6a7270c0d4..a66a275787 100644
--- a/lib/http.c
+++ b/lib/http.c
@@ -2704,6 +2704,8 @@ CURLcode Curl_http(struct Curl_easy *data, bool *done)
       if(result)
         goto fail;
       info_version = "HTTP/2";
+      /* There is no ALPN here, but the connection is now definitely h2 */
+      conn->httpversion_seen = 20;
     }
     else
       info_version = "HTTP/1.x";