Minor code reorganization and polishing

server/httputil/response.go

@@ -5,8 +5,7 @@ import (
 	"net/http"
 )
 
-type H map[string]interface{}
-
+// WriteJSON returns the data as json to the client.
 func WriteJSON(w http.ResponseWriter, data interface{}) {
 	w.Header().Set("Content-Type", "application/json")
 	err := json.NewEncoder(w).Encode(data)
@@ -15,6 +14,7 @@ func WriteJSON(w http.ResponseWriter, data interface{}) {
 	}
 }
 
+// ReadJSON decodes the request body inside the given pointer.
 func ReadJSON(r *http.Request, data interface{}) error {
 	return json.NewDecoder(r.Body).Decode(data)
 }