I have the following Go code:
package main
import (
"encoding/json"
"fmt"
"github.com/gorilla/mux"
"github.com/gorilla/handlers"
"log"
"net/http"
"io/ioutil"
)
type rLog struct {
Method string
URI string
FormParam string
}
func commonMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Add("Content-Type", "application/json")
formBs, err := ioutil.ReadAll(r.Body)
if err != nil {
log.Fatalf("Failed to decode postFormByteSlice: %v", err)
}
rl := rLog{Method: r.Method, URI: r.RequestURI, FormParam: string(formBs)}
log.Printf("%+v", rl)
next.ServeHTTP(w, r)
})
}
func main() {
port := ":3000"
var router = mux.NewRouter()
router.Use(commonMiddleware)
router.HandleFunc("/m/{msg}", handleMessage).Methods("GET")
router.HandleFunc("/n/", handleNumber).Methods("POST")
headersOk := handlers.AllowedHeaders([]string{"Authorization"})
originsOk := handlers.AllowedOrigins([]string{"*"})
methodsOk := handlers.AllowedMethods([]string{"GET", "POST", "OPTIONS"})
fmt.Printf("Server is running at http://localhost%s
", port)
log.Fatal(http.ListenAndServe(port, handlers.CORS(originsOk, headersOk, methodsOk)(router)))
}
func handleMessage(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
message := vars["msg"]
response := map[string]string{"message": message}
json.NewEncoder(w).Encode(response)
}
func handleNumber(w http.ResponseWriter, r *http.Request) {
log.Println(r.FormValue("name")) // this returns nothing
response := map[string]string{"name": "1"} // dummy response
json.NewEncoder(w).Encode(response)
}
What I try to do here is very simple.
- I want to log all POST form data (it's done inside the
commonMiddleware
) - Access the form data inside the
handleNumber
i.e.name
(and many more later) and do some logic with it.
The problem that I have right now is, the log.Println(r.FormValue("name"))
returns nothing and I really wonder why that happened.
I've tried adding r.ParseForm()
before log.Println(r.FormValue("name"))
. But it didn't work.
And, when I add log.Println(r.Form)
line, it returns map[]
.
What did I missed here?