allow to configure ALPN protocols

Fixes #1406

Signed-off-by: Nicola Murino <nicola.murino@gmail.com>

internal/httpclient/httpclient.go

@@ -94,8 +94,7 @@ func (c *Config) Initialize(configDir string) error {
 		customTransport.TLSClientConfig.RootCAs = rootCAs
 	} else {
 		customTransport.TLSClientConfig = &tls.Config{
-			RootCAs:    rootCAs,
-			NextProtos: []string{"h2", "http/1.1"},
+			RootCAs: rootCAs,
 		}
 	}
 	customTransport.TLSClientConfig.InsecureSkipVerify = c.SkipTLSVerify