Merge pull request #540 from smallstep/proxy-always

Always specify a Proxy in all custom transports.

ca/client.go

@@ -57,6 +57,7 @@ func newInsecureClient() *uaClient {
 	return &uaClient{
 		Client: &http.Client{
 			Transport: &http.Transport{
+				Proxy:           http.ProxyFromEnvironment,
 				TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
 			},
 		},