fix: set correct header

Signed-off-by: Viet-Anh Duong <vietanhs0817@gmail.com>

Author: vietanhduong

hander.go

@@ -39,7 +39,8 @@ func errorHandler(t *template.Template) func(http.ResponseWriter, *http.Request)
 		w.Header().Set(RequestId, r.Header.Get(RequestId))
 
 		format := r.Header.Get(ContentType)
-		if strings.HasPrefix(format, "application/json") {
+		fmt.Println(format)
+		if !strings.HasPrefix(format, "application/json") {
 			format = DefaultFormat
 		}
 
@@ -66,7 +67,7 @@ func errorHandler(t *template.Template) func(http.ResponseWriter, *http.Request)
 			Message:     message,
 		}
 
-		if format == "application/json" {
+		if strings.HasPrefix(format, "application/json") {
 			respContent, err := json.Marshal(&resp)
 			if err != nil {
 				log.Printf("Marshal json error: %v\n", err)