From e9c891d5b5cfdff1a42ccfef1735c4d28d84ff2c Mon Sep 17 00:00:00 2001
From: Darhwa <65339668+darhwa@users.noreply.github.com>
Date: Fri, 31 Jul 2020 13:11:42 +0800
Subject: [PATCH] Enable ForceAttemptHTTP2 on DoH client

---
 app/dns/dohdns.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/app/dns/dohdns.go b/app/dns/dohdns.go
index 02b0906c..3f4f7dcd 100644
--- a/app/dns/dohdns.go
+++ b/app/dns/dohdns.go
@@ -58,6 +58,7 @@ func NewDoHNameServer(url *url.URL, dispatcher routing.Dispatcher, clientIP net.
 		MaxIdleConns:        30,
 		IdleConnTimeout:     90 * time.Second,
 		TLSHandshakeTimeout: 30 * time.Second,
+		ForceAttemptHTTP2:   true,
 		DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
 			dest, err := net.ParseDestination(network + ":" + addr)
 			if err != nil {
@@ -89,7 +90,8 @@ func NewDoHLocalNameServer(url *url.URL, clientIP net.IP) *DoHNameServer {
 	url.Scheme = "https"
 	s := baseDOHNameServer(url, "DOHL", clientIP)
 	tr := &http.Transport{
-		IdleConnTimeout: 90 * time.Second,
+		IdleConnTimeout:   90 * time.Second,
+		ForceAttemptHTTP2: true,
 		DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
 			dest, err := net.ParseDestination(network + ":" + addr)
 			if err != nil {