add chapter 15.11 (#688)

eBook/examples/chapter_15/websocket_server.go

@@ -0,0 +1,29 @@
+// websocket_server.go
+package main
+
+import (
+	"fmt"
+	"net/http"
+	"code.google.com/p/go.net/websocket"
+)
+
+func server(ws *websocket.Conn) {
+	fmt.Printf("new connection\n")
+	buf := make([]byte, 100)
+	for {
+		if _, err := ws.Read(buf); err != nil {
+			fmt.Printf("%s", err.Error())
+			break
+		}
+	}
+	fmt.Printf(" => closing connection\n")
+	ws.Close()
+}
+
+func main() {
+	http.Handle("/websocket", websocket.Handler(server))
+	err := http.ListenAndServe(":12345", nil)
+	if err != nil {
+		panic("ListenAndServe: " + err.Error())
+	}
+}