fix: fmt output log to os.Stderr (#1571)

appleboy · web-flow · commit 402ef120e192 · 2018-09-27T08:59:44.000+08:00
fix #1560 changes are breaking in App Engine. cc @giulianobr @philippgille
diff --git a/debug.go b/debug.go
@@ -8,6 +8,7 @@ import (
 	"bytes"
 	"fmt"
 	"html/template"
+	"os"
 	"runtime"
 	"strconv"
 	"strings"
@@ -50,7 +51,7 @@ 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...)
 	}
 }
 

Original file line number	Diff line number	Diff line change
`@@ -8,6 +8,7 @@ import (`
`8`	`8`	`"bytes"`
`9`	`9`	`"fmt"`
`10`	`10`	`"html/template"`
	`11`	`+ "os"`
`11`	`12`	`"runtime"`
`12`	`13`	`"strconv"`
`13`	`14`	`"strings"`
`@@ -50,7 +51,7 @@ func debugPrintLoadTemplate(tmpl *template.Template) {`
`50`	`51`
`51`	`52`	`func debugPrint(format string, values ...interface{}) {`
`52`	`53`	`if IsDebugging() {`
`53`		`- fmt.Printf("[GIN-debug] "+format, values...)`
	`54`	`+ fmt.Fprintf(os.Stderr, "[GIN-debug] "+format, values...)`
`54`	`55`	`}`
`55`	`56`	`}`
`56`	`57`