Use dns.DefaultMsgSize instead of magic number 4096

doh-client/client.go

@@ -72,7 +72,7 @@ func NewClient(conf *config) (c *Client, err error) {
 			Addr:    addr,
 			Net:     "udp",
 			Handler: udpHandler,
-			UDPSize: 4096,
+			UDPSize: dns.DefaultMsgSize,
 		})
 		c.tcpServers = append(c.tcpServers, &dns.Server{
 			Addr:    addr,

doh-client/ietf.go

@@ -73,7 +73,7 @@ func (c *Client) generateRequestIETF(w dns.ResponseWriter, r *dns.Msg, isTCP boo
 		opt = new(dns.OPT)
 		opt.Hdr.Name = "."
 		opt.Hdr.Rrtype = dns.TypeOPT
-		opt.SetUDPSize(4096)
+		opt.SetUDPSize(dns.DefaultMsgSize)
 		opt.SetDo(false)
 		r.Extra = append(r.Extra, opt)
 	} else {