How to do it…

Let's implement logging using Gorilla handlers. Perform the following steps:

1. Install the github.com/gorilla/handler and github.com/gorilla/mux packages using the go get command, as follows:

$ go get github.com/gorilla/handlers
$ go get github.com/gorilla/mux

2. Create http-server-request-logging.go and copy the following content:

package main
import 
(
  "net/http"
  "os"
  "github.com/gorilla/handlers"
  "github.com/gorilla/mux"
)
const 
(
  CONN_HOST = "localhost"
  CONN_PORT = "8080"
)
var GetRequestHandler = http.HandlerFunc
(
  func(w http.ResponseWriter, r *http.Request) 
  {
    w.Write([]byte("Hello World!"))
  }
)
var PostRequestHandler = http.HandlerFunc
(
  func(w http.ResponseWriter, r *http.Request) 
  {
    w.Write([]byte("It's a Post Request!"))
  }
)
var PathVariableHandler = http.HandlerFunc
(
  func(w http.ResponseWriter, r *http.Request) 
  {
    vars := mux.Vars(r)
    name := vars["name"]
    w.Write([]byte("Hi " + name))
  }
)
func main() 
{
  router := mux.NewRouter()
  router.Handle("/", handlers.LoggingHandler(os.Stdout,
  http.HandlerFunc(GetRequestHandler))).Methods("GET")
  logFile, err := os.OpenFile("server.log",
  os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0666)
  if err != nil 
  {
    log.Fatal("error starting http server : ", err)
    return
  }
  router.Handle("/post", handlers.LoggingHandler(logFile,
  PostRequestHandler)).Methods("POST")
  router.Handle("/hello/{name}",
  handlers.CombinedLoggingHandler(logFile,
  PathVariableHandler)).Methods("GET")
  http.ListenAndServe(CONN_HOST+":"+CONN_PORT, router)
}

3. Run the program, using the following command:

$ go run http-server-request-logging.go