diff --git a/ims/client.go b/ims/client.go
index 43a88cf..cf77d03 100644
--- a/ims/client.go
+++ b/ims/client.go
@@ -16,9 +16,8 @@ func (i Config) httpClient() (*http.Client, error) {
 		if err != nil {
 			return nil, fmt.Errorf("proxy provided but its URL is malformed")
 		}
-		t := &http.Transport{
-			Proxy: http.ProxyURL(p),
-		}
+		t := http.DefaultTransport.(*http.Transport).Clone()
+		t.Proxy = http.ProxyURL(p)
 		if i.ProxyIgnoreTLS {
 			t.TLSClientConfig = &tls.Config{InsecureSkipVerify: true}
 		}