private String generateDefaultUrl() {
        return LOCALHOST + ":" + PORT_TEST_VALUE_1;
    }
url generate by host and port.
shenyu-plugin/shenyu-plugin-fault-tolerance/shenyu-plugin-ratelimiter/src/test/java/org/apache/shenyu/plugin/ratelimiter/handler/RateLimiterPluginDataHandlerTest.java