public Function<Object, Object> getFunc() {
            return func;
        }
Get param to invoke tars server.

@param paramTypes paramTypes
@param paramNames paramNames
@param body       body
@return the param to invoke
shenyu-plugin/shenyu-plugin-proxy/shenyu-plugin-rpc/shenyu-plugin-tars/src/main/java/org/apache/shenyu/plugin/tars/util/PrxInfoUtil.java