update doc

README.md

@@ -28,6 +28,7 @@ frp is a fast reverse proxy to help you expose a local server behind a NAT or fi
     * [Privilege Mode](#privilege-mode)
         * [Port White List](#port-white-list)
     * [TCP Stream Multiplexing](#tcp-stream-multiplexing)
+    * [Support KCP Protocol](#support-kcp-protocol)
     * [Connection Pool](#connection-pool)
     * [Rewriting the Host Header](#rewriting-the-host-header)
     * [Password protecting your web service](#password-protecting-your-web-service)
@@ -319,6 +320,35 @@ You can disable this feature by modify frps.ini and frpc.ini:
 tcp_mux = false
 ```
 
+### Support KCP Protocol
+
+frp support kcp protocol since v0.12.0.
+
+KCP is a fast and reliable protocol that can achieve the transmission effect of a reduction of the average latency by 30% to 40% and reduction of the maximum delay by a factor of three, at the cost of 10% to 20% more bandwidth wasted than TCP.
+
+Using kcp in frp:
+
+1. Enable kcp protocol in frps:
+
+  ```ini
+  # frps.ini
+  [common]
+  bind_port = 7000
+  # kcp needs to bind a udp port, it can be same with 'bind_port'
+  kcp_bind_port = 7000
+  ```
+
+2. Configure the protocol used in frpc to connect frps:
+
+  ```ini
+  # frpc.ini
+  [common]
+  server_addr = x.x.x.x
+  # specify the 'kcp_bind_port' in frps
+  server_port = 7000
+  protocol = kcp
+  ```
+
 ### Connection Pool
 
 By default, frps send message to frpc for create a new connection to backward service when getting an user request.If a proxy's connection pool is enabled, there will be a specified number of connections pre-established.

README_zh.md

@@ -26,6 +26,7 @@ frp 是一个可用于内网穿透的高性能的反向代理应用，支持 tcp
     * [特权模式](#特权模式)
         * [端口白名单](#端口白名单)
     * [TCP 多路复用](#tcp-多路复用)
+    * [支持 kcp 协议](#支持-kcp-协议)
     * [连接池](#连接池)
     * [修改 Host Header](#修改-host-header)
     * [通过密码保护你的 web 服务](#通过密码保护你的-web-服务)
@@ -326,6 +327,35 @@ privilege_allow_ports 可以配置允许使用的某个指定端口或者是一
 tcp_mux = false
 ```
 
+### 支持 kcp 协议
+
+从 v0.12.0 版本开始，底层通信协议支持选择 kcp 协议，在弱网环境下传输效率提升明显，但是会有一些额外的流量消耗。
+
+开启 kcp 协议支持：
+
+1. 在 frps.ini 中启用 kcp 协议支持，指定一个 udp 端口用于接收客户端请求：
+
+  ```ini
+  # frps.ini
+  [common]
+  bind_port = 7000
+  # kcp 绑定的是 udp 端口，可以和 bind_port 一样
+  kcp_bind_port = 7000
+  ```
+
+2. 在 frpc.ini 指定需要使用的协议类型，目前只支持 tcp 和 kcp。其他代理配置不需要变更：
+
+  ```ini
+  # frpc.ini
+  [common]
+  server_addr = x.x.x.x
+  # server_port 指定为 frps 的 kcp_bind_port
+  server_port = 7000
+  protocol = kcp
+  ```
+
+3. 像之前一样使用 frp，需要注意开放相关机器上的 udp 的端口的访问权限。
+
 ### 连接池
 
 默认情况下，当用户请求建立连接后，frps 才会请求 frpc 主动与后端服务建立一个连接。当为指定的代理启用连接池后，frp 会预先和后端服务建立起指定数量的连接，每次接收到用户请求后，会从连接池中取出一个连接和用户连接关联起来，避免了等待与后端服务建立连接以及 frpc 和 frps 之间传递控制信息的时间。

conf/frps_full.ini

@@ -5,6 +5,10 @@
 bind_addr = 0.0.0.0
 bind_port = 7000
 
+# udp port used for kcp protocol, it can be same with 'bind_port'
+# if not set, kcp is disabled in frps
+kcp_bind_port = 7000
+
 # if you want to support virtual host, you must set the http port for listening (optional)
 vhost_http_port = 80
 vhost_https_port = 443
@@ -49,6 +53,3 @@ subdomain_host = frps.com
 
 # if tcp stream multiplexing is used, default is true
 tcp_mux = true
-
-# if server support client using kcp protocol, default is true
-support_kcp = true