From 70be70de3cf89f58a7ce76c7d8779b78a3304b26 Mon Sep 17 00:00:00 2001
From: Evgeniy Kulikov <im@kulikov.im>
Date: Tue, 26 Feb 2019 21:44:47 +0300
Subject: [PATCH] DualStack is deprecated

```
	// DualStack previously enabled RFC 6555 Fast Fallback
	// support, also known as "Happy Eyeballs", in which IPv4 is
	// tried soon if IPv6 appears to be misconfigured and
	// hanging.
	//
	// Deprecated: Fast Fallback is enabled by default. To
	// disable, set FallbackDelay to a negative value.
	DualStack bool
```
---
 config/global_ips.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/config/global_ips.go b/config/global_ips.go
index 0660338..9a144a6 100644
--- a/config/global_ips.go
+++ b/config/global_ips.go
@@ -21,7 +21,7 @@ func getGlobalIPv6() (net.IP, error) {
 }
 
 func fetchIP(network string) (net.IP, error) {
-	dialer := &net.Dialer{DualStack: false}
+	dialer := &net.Dialer{FallbackDelay: -1}
 	client := &http.Client{
 		Jar: nil,
 		Transport: &http.Transport{