From ad63fc05105799ec7f6324daf641e80a3f605e8b Mon Sep 17 00:00:00 2001
From: Brad Fitzpatrick <bradfitz@tailscale.com>
Date: Sun, 7 Nov 2021 13:49:55 -0800
Subject: [PATCH] control/controlclient: make js/wasm work with Go 1.18+

Updates #3157

Change-Id: I2d67e582842ab3638d720bb5db4701b878ad4473
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
---
 control/controlclient/direct.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/control/controlclient/direct.go b/control/controlclient/direct.go
index 67446b03b..ce15486cc 100644
--- a/control/controlclient/direct.go
+++ b/control/controlclient/direct.go
@@ -146,6 +146,13 @@ func NewDirect(opts Options) (*Direct, error) {
 	}
 
 	httpc := opts.HTTPTestClient
+	if httpc == nil && runtime.GOOS == "js" {
+		// In js/wasm, net/http.Transport (as of Go 1.18) will
+		// only use the browser's Fetch API if you're using
+		// the DefaultClient (or a client without dial hooks
+		// etc set).
+		httpc = http.DefaultClient
+	}
 	if httpc == nil {
 		dnsCache := &dnscache.Resolver{
 			Forward:          dnscache.Get().Forward, // use default cache's forwarder