diff --git a/router.go b/router.go
index 0f1c37d..09adf59 100644
--- a/router.go
+++ b/router.go
@@ -69,59 +69,67 @@ func (s *Server) route(res http.ResponseWriter, req *http.Request) {
 		return
 	}
 
-	/* (4) Check arguments
+	/* (4) Check parameters
 	---------------------------------------------------------*/
 	var paramError Err = ErrSuccess
+	parameters := make(map[string]interface{})
 	for name, param := range method.Parameters {
-		fmt.Printf("- parameter '%s'\n", name)
 
 		/* (1) Extract value */
 		p, isset := request.Data.Set[name]
 
-		/* (2) OPTIONAL ? */
-		if !isset {
-
-			// fail if required
-			if !*param.Optional {
-				fmt.Printf("  - required and missing\n")
-				paramError = ErrMissingParam
-				paramError.BindArgument(name)
-				break
-
-				// error if default param is nil
-			} else if param.Default == nil {
-				fmt.Printf("  - required and no default\n")
-				paramError = ErrInvalidDefaultParam
-				paramError.BindArgument(name)
-				break
-
-				// set default p if optional
-			} else {
-				fmt.Printf("  - default value: '%v'\n", *param.Default)
-				p = &RequestParameter{
-					Parsed: true,
-					Value:  *param.Default,
-				}
-			}
-
+		/* (2) Required & missing */
+		if !isset && !*param.Optional {
+			paramError = ErrMissingParam
+			paramError.BindArgument(name)
+			break
 		}
 
-		/* (3) Parse parameter variable */
+		/* (3) Optional & missing: set default value */
+		if !isset {
+			p = &RequestParameter{
+				Parsed: true,
+				File:   param.Type == "FILE",
+				Value:  nil,
+			}
+			if param.Default != nil {
+				p.Value = *param.Default
+			}
+		}
+
+		/* (4) Parse parameter if not file */
 		if !p.Parsed && !p.File {
 			p.Value = parseHttpData(p.Value)
 		}
 
-		/* (4) Check type */
-		isValid := s.Checker.Run(param.Type, p.Value)
-		fmt.Printf("  - valid: %t\n", isValid == nil)
-		if isValid != nil {
+		/* (4) Fail on unexpected multipart file */
+		waitFile, gotFile := param.Type == "FILE", p.File
+		if gotFile && !waitFile || !gotFile && waitFile {
+			paramError = ErrInvalidParam
+			paramError.BindArgument(name)
+			paramError.BindArgument("FILE")
+			break
+		}
+
+		/* (5) Do not check if file */
+		if gotFile {
+			parameters[name] = p.Value
+			continue
+		}
+
+		/* (6) Check type */
+		if s.Checker.Run(param.Type, p.Value) != nil {
+
 			paramError = ErrInvalidParam
 			paramError.BindArgument(name)
 			paramError.BindArgument(param.Type)
 			paramError.BindArgument(p.Value)
 			break
+
 		}
 
+		parameters[name] = p.Value
+
 	}
 	fmt.Printf("\n")
 
@@ -135,5 +143,8 @@ func (s *Server) route(res http.ResponseWriter, req *http.Request) {
 	}
 
 	fmt.Printf("OK\nplugin: '%si.so'\n", strings.Join(request.ControllerUri, "/"))
+	for name, value := range parameters {
+		fmt.Printf("  $%s = %v\n", name, value)
+	}
 	return
 }