default List<String> supportedClient() {
        return Arrays.stream(RpcTypeEnum.values())
                .map(RpcTypeEnum::getName)
                .collect(Collectors.toList());
    }
By default, all client pairs are supported.

@return support type.
@see RpcTypeEnum
shenyu-client/shenyu-client-core/src/main/java/org/apache/shenyu/client/core/register/matcher/ExtractorProcessor.java