fix default value for size = 0

transport/pipe/pipe.go

@@ -57,7 +57,9 @@ func init() {
 		Name:    raySizeEnvKey,
 		AltName: platform.NormalizeEnvName(raySizeEnvKey),
 	}.GetValueAsInt(10)
-	if size > 0 {
+	if size == 0 {
+		defaultLimit = 2147483647
+	} else {
 		defaultLimit = int32(size) * 1024 * 1024
 	}
 }