From 9074b78e36e97ccb83f9e004eb2a24c330226127 Mon Sep 17 00:00:00 2001
From: 5aaee9 <7685264+5aaee9@users.noreply.github.com>
Date: Mon, 10 Feb 2025 15:21:18 +0800
Subject: [PATCH] chore(dns): increase MaxConnsPerHost (#1834)

---
 dns/doh.go | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/dns/doh.go b/dns/doh.go
index 027afd58..50c72109 100644
--- a/dns/doh.go
+++ b/dns/doh.go
@@ -37,13 +37,14 @@ const (
 	transportDefaultIdleConnTimeout = 5 * time.Minute
 
 	// dohMaxConnsPerHost controls the maximum number of connections for
-	// each host.
-	dohMaxConnsPerHost = 1
+	// each host.  Note, that setting it to 1 may cause issues with Go's http
+	// implementation, see https://github.com/AdguardTeam/dnsproxy/issues/278.
+	dohMaxConnsPerHost = 2
 	dialTimeout        = 10 * time.Second
 
 	// dohMaxIdleConns controls the maximum number of connections being idle
 	// at the same time.
-	dohMaxIdleConns = 1
+	dohMaxIdleConns = 2
 	maxElapsedTime  = time.Second * 30
 )