Simple server

package main

import (
    "fmt"
    "log"
    "os"
    "net"
    "net/http"
    "net/http/fcgi"
)

var logPath string = "stat.log"

type FastCGIServer struct{}
func (s FastCGIServer) ServeHTTP(w http.ResponseWriter, req *http.Request) {
    w.Write([]byte("Game statistics.\n"))
    if req.Method == "POST" {
        w.Write([]byte("ID = " + req.FormValue("i") + "\n"))
        w.Write([]byte("Version = " + req.FormValue("v") + "\n"))
    }
    w.Write([]byte("Game = " + req.FormValue("game") + "\n"))
    // How to access logger inside this function?
    //logger.Println("Game = " + req.FormValue("game"))
}

func main() {
    logFile, err := os.OpenFile(logPath, os.O_APPEND | os.O_RDWR, 0666)
    if os.IsNotExist(err) {
        // Create file if not exist and assign it to logFile variable - this doesn't work
        logFile, _ := os.Create(logPath)
    }
    logger := log.New(logFile, "", log.Ldate | log.Ltime)
    logger.Println("Start")

    fmt.Printf("Starting server")
    l, _ := net.Listen("tcp", "127.0.0.1:9001")
    b := new(FastCGIServer)
    fcgi.Serve(l, b)

    fmt.Printf("Server stopped")
    logFile.Close()
}