From c7b1e10dc1dcacae17fc75fdb6572846605d2ffe Mon Sep 17 00:00:00 2001
From: CatboxParadox <CatboxParadox@users.noreply.github.com>
Date: Tue, 28 Jul 2026 14:12:09 +0200
Subject: [PATCH] h2: bootstrap max streams from multi handle if in use

Closes #22418
---
 lib/http2.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/http2.c b/lib/http2.c
index b8733d8ec1..08dfb6d919 100644
--- a/lib/http2.c
+++ b/lib/http2.c
@@ -2412,7 +2412,9 @@ static CURLcode cf_h2_ctx_open(struct Curl_cfilter *cf,
     failf(data, "Could not initialize nghttp2");
     goto out;
   }
-  ctx->max_concurrent_streams = DEFAULT_MAX_CONCURRENT_STREAMS;
+  ctx->max_concurrent_streams = data->multi ?
+    Curl_multi_max_concurrent_streams(data->multi) :
+    DEFAULT_MAX_CONCURRENT_STREAMS;
 
   if(ctx->via_h1_upgrade) {
     /* HTTP/1.1 Upgrade issued. H2 Settings have already been submitted