Handle ECH H2C query correctly

Co-Authored-By: j2rong4cn <36783515+j2rong4cn@users.noreply.github.com>

proxy/tun/handler.go

@@ -2,8 +2,6 @@ package tun
 
 import (
 	"context"
-	"net/netip"
-	"strings"
 	"syscall"
 
 	"github.com/xtls/xray-core/common"
@@ -82,11 +80,6 @@ func (t *Handler) Init(ctx context.Context, pm policy.Manager, dispatcher routin
 				return nil
 			}
 			return c.Control(func(fd uintptr) {
-				addrPort, _ := netip.ParseAddrPort(address)
-				// skip loopback
-				if addrPort.Addr().IsLoopback() || strings.HasPrefix(strings.ToLower(address), "localhost:") {
-					return
-				}
 				err := setinterface(network, address, fd, iface)
 				if err != nil {
 					errors.LogInfoInner(context.Background(), err, "[tun] falied to set interface")

transport/internet/tls/ech.go

@@ -234,6 +234,9 @@ func dnsQuery(server string, domain string, sockopt *internet.SocketConfig) ([]b
 		if err != nil {
 			return nil, 0, err
 		}
+		// h2c: in config is just for claim
+		// change scheme to https and expect outbound to handle TLS (freedom + tlsSetting)
+		req.URL.Scheme = "https"
 		req.Header.Set("Accept", "application/dns-message")
 		req.Header.Set("Content-Type", "application/dns-message")
 		utils.TryDefaultHeadersWith(req.Header, "fetch")