@BeforeClass
    public static void adBeforeClass() {
        /**
         * set config parameter to using http2 with 'upgrade h2c' startup frame
         */
        RpcConfigs.putValue(RpcOptions.TRANSPORT_CLIENT_H2C_USE_PRIOR_KNOWLEDGE, false);
        ActivelyDestroyTest.adBeforeClass();
    }
Keep the config parameter previous value for restore it later
test/test-integration/src/test/java/com/alipay/sofa/rpc/transport/http/Http2ClearTextHttpUpgradeTest.java