Refactors warning messages

debug.go

@@ -27,7 +27,7 @@ func debugPrint(format string, values ...interface{}) {
 	}
 }
 
-func debugPrintWARNING() {
+func debugPrintWARNING_New() {
 	debugPrint(`[WARNING] Running in "debug" mode. Switch to "release" mode in production.
  - using env:	export GIN_MODE=release
  - using code:	gin.SetMode(gin.ReleaseMode)
@@ -35,6 +35,16 @@ func debugPrintWARNING() {
 `)
 }
 
+func debugPrintWARNING_SetHTMLTemplate() {
+	debugPrint(`[WARNING] Since SetHTMLTemplate() is NOT thread-safe. It should only be called
+at initialization. ie. before any route is registered or the router is listening in a socket:
+
+	router := gin.Default()
+	router.SetHTMLTemplate(template) // << good place
+
+`)
+}
+
 func debugPrintError(err error) {
 	if err != nil {
 		debugPrint("[ERROR] %v\n", err)