From d8f05538bc751b4a9c7c2216ac56b404b9ff1918 Mon Sep 17 00:00:00 2001
From: Bo-Yi Wu <appleboy.tw@gmail.com>
Date: Wed, 26 Sep 2018 09:32:29 +0800
Subject: [PATCH] fix: output log to os.Stderr

---
 debug.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/debug.go b/debug.go
index ce908dc7e8..e58725cfbb 100644
--- a/debug.go
+++ b/debug.go
@@ -8,6 +8,7 @@ import (
 	"bytes"
 	"fmt"
 	"html/template"
+	"os"
 )
 
 // IsDebugging returns true if the framework is running in debug mode.
@@ -45,7 +46,7 @@ func debugPrintLoadTemplate(tmpl *template.Template) {
 
 func debugPrint(format string, values ...interface{}) {
 	if IsDebugging() {
-		fmt.Printf("[GIN-debug] "+format, values...)
+		fmt.Fprintf(os.Stderr, "[GIN-debug] "+format, values...)
 	}
 }