http server Websocket and serving a static page - go

Question

Consider the following sample
import (
"code.google.com/p/go.net/websocket"
"fmt"
"log"
"net/http"
"os"
)
type MessageReceived struct {
Name string
Nbmsg int
}
func Echo(ws *websocket.Conn) {
msg := new(MessageReceived)
for {
websocket.JSON.Receive(ws, &msg)
fmt.Printf("Received message: %+v\n", msg)
if err := websocket.JSON.Send(ws, msg); err != nil {
fmt.Println("Can't send echo")
break
}
//os.Exit(0)
}
}
func checkError(err error) {
if err != nil {
log.Printf("Fatal error: %s\n", err.Error())
os.Exit(1)
}
}
func main() {
http.Handle("/s", websocket.Handler(Echo))
fs := http.FileServer(http.Dir("web"))
err := http.ListenAndServe(":8081",fs)
checkError(err)
}
The page and static files gets served but when but i try to connect to the websocket from javascript i get
WebSocket connection to 'ws://localhost:8081/s' failed: Error during WebSocket handshake: Unexpected response code: 404
The only way i could make it work is by serving static files from a different go application server and serving the websocket also from a separate server application using 2 different ports on the local host, what am i missing in the above sample? how could i serve files and the websocket from the same server?

Answer 1

You're assigning the websocket.Handler to the DefaultServeMux, but only using the FileServer handler in your ListenAndServe call.
Add the FileServer handler to the DefaultServe mux too, with some non-conflicting prefix:
func main() {
http.Handle("/s", websocket.Handler(Echo))
http.Handle("/f", http.FileServer(http.Dir("web"))
err := http.ListenAndServe(":8081", nil)
checkError(err)
}