From 1c31982f8bf793faddc3e2d58967dade02a4bd1e Mon Sep 17 00:00:00 2001
From: Kyle Carberry <kyle@carberry.com>
Date: Mon, 6 Nov 2023 16:27:00 +0000
Subject: [PATCH] fix: use `DefaultTransport` in `exchangeWithClientSecret` if
 nil

---
 coderd/externalauth/externalauth.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/coderd/externalauth/externalauth.go b/coderd/externalauth/externalauth.go
index 04d8dae9bc99f..fc98de5e9197d 100644
--- a/coderd/externalauth/externalauth.go
+++ b/coderd/externalauth/externalauth.go
@@ -635,6 +635,9 @@ func (e *exchangeWithClientSecret) Exchange(ctx context.Context, code string, op
 		httpClient = http.DefaultClient
 	}
 	oldTransport := httpClient.Transport
+	if oldTransport == nil {
+		oldTransport = http.DefaultTransport
+	}
 	httpClient.Transport = roundTripper(func(req *http.Request) (*http.Response, error) {
 		req.Header.Set("Authorization", "Bearer "+e.ClientSecret)
 		return oldTransport.RoundTrip(req)