Merge branch 'Alpha' into Beta

adapter/outbound/hysteria.go

@@ -72,6 +72,9 @@ func (h *Hysteria) ListenPacketContext(ctx context.Context, metadata *C.Metadata
 		hyDialer: func() (net.PacketConn, error) {
 			return dialer.ListenPacket(ctx, "udp", "", h.Base.DialOptions(opts...)...)
 		},
+		remoteAddr: func(addr string) (net.Addr, error) {
+			return resolveUDPAddrWithPrefer("udp", addr, h.prefer)
+		},
 	}
 	udpConn, err := h.client.DialUDP(&hdc)
 	if err != nil {

adapter/outbound/util.go

@@ -119,9 +119,12 @@ func resolveUDPAddrWithPrefer(network, address string, prefer C.DNSPrefer) (*net
 					}
 				}
 			}
+
+			if !ip.IsValid() && fallback.IsValid() {
 				ip = fallback
 			}
 		}
+	}
 
 	if err != nil {
 		return nil, err

docs/config.yaml

@@ -169,7 +169,7 @@ proxies:
                        # ipv4-prefer：优先使用 IPv4 对于 TCP 会进行双栈解析，并发链接但是优先使用 IPv4 链接,
                        # UDP 则为双栈解析，获取结果中的第一个 IPv4
                        # ipv6-prefer 同 ipv4-prefer
-                       # 现有协议都支持此参数
+                       # 现有协议都支持此参数，TCP 效果仅在开启 tcp-concurrent 生效
   - name: "ss2"
     type: ss
     server: server