Increase HTTP client timeouts (#1336)

lego/client_config.go

@@ -64,15 +64,15 @@ type CertificateConfig struct {
 // based on the caCertificatesEnvVar environment variable (see the `initCertPool` function).
 func createDefaultHTTPClient() *http.Client {
 	return &http.Client{
+		Timeout: 2 * time.Minute,
 		Transport: &http.Transport{
 			Proxy: http.ProxyFromEnvironment,
 			DialContext: (&net.Dialer{
 				Timeout:   30 * time.Second,
 				KeepAlive: 30 * time.Second,
 			}).DialContext,
-			TLSHandshakeTimeout:   15 * time.Second,
-			ResponseHeaderTimeout: 15 * time.Second,
-			ExpectContinueTimeout: 1 * time.Second,
+			TLSHandshakeTimeout:   30 * time.Second,
+			ResponseHeaderTimeout: 30 * time.Second,
 			TLSClientConfig: &tls.Config{
 				ServerName: os.Getenv(caServerNameEnvVar),
 				RootCAs:    initCertPool(),