caddyhttp: Enable HTTP/3 by default (#4707)

1 files changed, 10 insertions, 2 deletions

diff --git a/listeners.go b/listeners.go
index 3a8d49d..c7d6d52 100644
--- a/listeners.go
+++ b/listeners.go
@@ -88,11 +88,19 @@ func ListenPacket(network, addr string) (net.PacketConn, error) {
 // ListenQUIC returns a quic.EarlyListener suitable for use in a Caddy module.
 // Note that the context passed to Accept is currently ignored, so using
 // a context other than context.Background is meaningless.
-func ListenQUIC(addr string, tlsConf *tls.Config) (quic.EarlyListener, error) {
+func ListenQUIC(addr string, tlsConf *tls.Config, activeRequests *int64) (quic.EarlyListener, error) {
 	lnKey := listenerKey("udp", addr)
 
 	sharedEl, _, err := listenerPool.LoadOrNew(lnKey, func() (Destructor, error) {
-		el, err := quic.ListenAddrEarly(addr, http3.ConfigureTLSConfig(tlsConf), &quic.Config{})
+		el, err := quic.ListenAddrEarly(addr, http3.ConfigureTLSConfig(tlsConf), &quic.Config{
+			RequireAddressValidation: func(clientAddr net.Addr) bool {
+				var highLoad bool
+				if activeRequests != nil {
+					highLoad = atomic.LoadInt64(activeRequests) > 1000 // TODO: make tunable?
+				}
+				return highLoad
+			},
+		})
 		if err != nil {
 			return nil, err
 		}