Prevent crash if HTTP client options are not set

We should use Get*() here instead of accessing the struct field
directly, as the strict may be nil.

pkg/http/configuration.go

@@ -22,7 +22,7 @@ func NewRoundTripperFromConfiguration(configuration *pb.ClientConfiguration) (ht
 			Timeout:   30 * time.Second,
 			KeepAlive: 30 * time.Second,
 		}).DialContext,
-		ForceAttemptHTTP2: !configuration.DisableHttp2,
+		ForceAttemptHTTP2: !configuration.GetDisableHttp2(),
 		TLSClientConfig:   tlsConfig,
 	}
 	if proxyURL := configuration.GetProxyUrl(); proxyURL != "" {