set default to apache format

config.go

@@ -105,10 +105,10 @@ type SessionConfig struct {
 
 // LogConfig holds Log related config
 type LogConfig struct {
-	AccessLogs  bool
-	AccessLogsFormat  string //access log format: JSON_FORMAT, APACHE_FORMAT or empty string
-	FileLineNum bool
-	Outputs     map[string]string // Store Adaptor : config
+	AccessLogs       bool
+	AccessLogsFormat string //access log format: JSON_FORMAT, APACHE_FORMAT or empty string
+	FileLineNum      bool
+	Outputs          map[string]string // Store Adaptor : config
 }
 
 var (
@@ -246,10 +246,10 @@ func newBConfig() *Config {
 			},
 		},
 		Log: LogConfig{
-			AccessLogs:  false,
-			AccessLogsFormat:  "",
-			FileLineNum: true,
-			Outputs:     map[string]string{"console": ""},
+			AccessLogs:       false,
+			AccessLogsFormat: "APACHE_FORMAT",
+			FileLineNum:      true,
+			Outputs:          map[string]string{"console": ""},
 		},
 	}
 }