@AfterClass
    public static void adAfterClass() {
        ActivelyDestroyTest.adAfterClass();

        /**
         * restore config parameter to previous value
         */
        RpcConfigs.putValue(RpcOptions.TRANSPORT_CLIENT_H2C_USE_PRIOR_KNOWLEDGE, useH2cPriorKnowledge);
    }
set config parameter to using http2 with 'upgrade h2c' startup frame
test/test-integration/src/test/java/com/alipay/sofa/rpc/transport/http/Http2ClearTextHttpUpgradeTest.java