Disable HTTP/2

internal/module/kubernetes_api/agent/server.go

@@ -105,6 +105,7 @@ func (s *server) httpDo(ctx context.Context, h *grpctool.HttpRequest_Header, bod
 		}
 		rt, err = transport.HTTPWrappersForConfig(transportCfg, upgradeRT)
 	} else {
+		transportCfg.TLS.NextProtos = []string{httpz.TLSNextProtoH1}
 		rt, err = transport.New(transportCfg) // returns pooled transports that reuse TCP connections
 	}
 	if err != nil {