title: Reflection error on GoLang - Too few arguments
body: <p>I have this controller:</p>
  
  <pre><code>package web
  
  import (
      "net/http"
  )
  
  func init() {
  
  }
  
  func (controller *Controller) Index(r *http.Request) (string, int) {
      return "Testing", http.StatusOK
  }
  </code></pre>
  
  <p>With this handler:</p>
  
  <pre><code>type Application struct {
  }
  
  func (application *Application) Route(controller interface{}, route string) http.HandlerFunc {
      return func(w http.ResponseWriter, r *http.Request) {
  
          var ptr reflect.Value
          var value reflect.Value
          var finalMethod reflect.Value
  
          value = reflect.ValueOf(controller)
  
          // if we start with a pointer, we need to get value pointed to
          // if we start with a value, we need to get a pointer to that value
          if value.Type().Kind() == reflect.Ptr {
              ptr = value
              value = ptr.Elem()
          } else {
              ptr = reflect.New(reflect.TypeOf(controller))
              temp := ptr.Elem()
              temp.Set(value)
          }
  
          // check for method on value
          method := value.MethodByName(route)
          if method.IsValid() {
              finalMethod = method
          }
          // check for method on pointer
          method = ptr.MethodByName(route)
          if method.IsValid() {
              finalMethod = method
          }
  
          methodInterface := finalMethod.Call([]reflect.Value{})[0].Interface()
          method_route := methodInterface.(func(r *http.Request) (string, int))
          body, code := method_route(r)
          switch code {
          case http.StatusOK:
              io.WriteString(w, body)
          case http.StatusSeeOther, http.StatusFound:
              http.Redirect(w, r, body, code)
          default:
              w.WriteHeader(code)
              io.WriteString(w, body)
          }
      }
  }
  </code></pre>
  
  <p>And it is executed in this way:</p>
  
  <pre><code>controller := &amp;web.Controller{}
  application := &amp;system.Application{}
  
  http.HandleFunc("/", application.Route(controller, "Index"))
  </code></pre>
  
  <p>The problem is it compiled ok. It does not show any error, but when I go to the website, just by pointing at localhost, it shows:</p>
  
  <pre><code>2014/12/27 22:38:16 http: panic serving 127.0.0.1:58304: reflect: Call with too few input arguments
  goroutine 20 [running]:
  net/http.func·011()
      /usr/local/Cellar/go/1.3.3/libexec/src/pkg/net/http/server.go:1100 +0xb7
  </code></pre>
  
  <p>I cannot find any error, and it is more strange it compiles ok... I'm new in Go, so I've no idea what is going on...</p>