private List<GrpcUpstream> buildGrpcUpstreamList(final List<URIRegisterDTO> uriList) {
        return uriList.stream()
                .map(dto -> CommonUpstreamUtils.buildDefaultGrpcUpstream(dto.getHost(), dto.getPort(), dto.getNamespaceId()))
                .collect(Collectors.toCollection(CopyOnWriteArrayList::new));
    }
Build handle string.

@param uriList    the uri list
@param selectorDO the selector do
@return the string
shenyu-admin/src/main/java/org/apache/shenyu/admin/service/register/ShenyuClientRegisterGrpcServiceImpl.java