Updated Writing a Plugin: Server Type (markdown)

Writing-a-Plugin:-Server-Type.md

@@ -57,15 +57,22 @@ Ultimately, your goal is to make it so that `MakeServers()` returns a list of [c
 
 For example: the HTTP server [uses its context type](https://github.com/mholt/caddy/blob/aede4ccbce94bcb67161674e30dd1bfa7296448c/caddyhttp/httpserver/plugin.go#L54-L63) to keep a map of site configs. The package also has an exported function, `GetConfig(c Controller)` that gets a config for a certain site, designated by the [caddy.Controller](https://godoc.org/github.com/mholt/caddy#Controller) that is passed in. The config, in turn, stores the list of middleware, etc -- all the information needed to set up a site. Each directive's action calls the GetConfig function so they can help set up the site properly. By the time `MakeServers()` is called, all it has to do is combine those site configs into server instances and return them. (Server instances implement [caddy.Server](https://godoc.org/github.com/mholt/caddy#Server).)
 
-The caddy.Server interface has four methods; two are for TCP, two are for UDP or other:
+## Server
+
+The `caddy.Server` interface considers both TCP and non-TCP servers. It has four methods; two are for TCP, two are for UDP or other:
 
 ```go
 type Server interface {
-    // Required if using TCP
+    TCPServer // Required if using TCP
+    UDPServer // Required if using UDP or other
+}
+
+type TCPServer interface {
     Listen() (net.Listener, error)
     Serve(net.Listener) error
+}
 
-    // Required if using UDP or other
+type UDPServer interface {
     ListenPacket() (net.PacketConn, error)
     ServePacket(net.PacketConn) error
 }