报错信息

java.ConnectException: no available server, currentServerAddr : http://127.0.0.1:8848
    at com.alibaba.nacos.client.config.http.ServerHttpAgent.httpPost(ServerHttpAgent.java:170) ~[nacos-client-1.1.4.jar:na]
    at com.alibaba.nacos.client.config.http.MetricsHttpAgent.httpPost(MetricsHttpAgent.java:64) ~[nacos-client-1.1.4.jar:na]
    at com.alibaba.nacos.client.config.impl.ClientWorker.checkUpdateConfigStr(ClientWorker.java:377) [nacos-client-1.1.4.jar:na]
    at com.alibaba.nacos.client.config.impl.ClientWorker.checkUpdateDataIds(ClientWorker.java:352) [nacos-client-1.1.4.jar:na]
    at com.alibaba.nacos.client.config.impl.ClientWorker$LongPollingRunnable.run(ClientWorker.java:512) [nacos-client-1.1.4.jar:na]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_25]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_25]
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_25]
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1.8.0_25]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_25]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_25]
    at java.lang.Thread.run(Thread.java:745) [na:1.8.0_25]

2021-12-11 09:51:16.052 ERROR [jiuyv-gateway,,,] 15364 --- [252.80.198_8848] c.a.n.client.config.impl.ClientWorker    : longPolling error :

java.ConnectException: no available server, currentServerAddr : http://127.0.0.1:8848
    at com.alibaba.nacos.client.config.http.ServerHttpAgent.httpPost(ServerHttpAgent.java:170) ~[nacos-client-1.1.4.jar:na]
    at com.alibaba.nacos.client.config.http.MetricsHttpAgent.httpPost(MetricsHttpAgent.java:64) ~[nacos-client-1.1.4.jar:na]
    at com.alibaba.nacos.client.config.impl.ClientWorker.checkUpdateConfigStr(ClientWorker.java:377) ~[nacos-client-1.1.4.jar:na]
    at com.alibaba.nacos.client.config.impl.ClientWorker.checkUpdateDataIds(ClientWorker.java:352) ~[nacos-client-1.1.4.jar:na]
    at com.alibaba.nacos.client.config.impl.ClientWorker$LongPollingRunnable.run(ClientWorker.java:512) ~[nacos-client-1.1.4.jar:na]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_25]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_25]
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_25]
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1.8.0_25]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_25]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_25]
    at java.lang.Thread.run(Thread.java:745) [na:1.8.0_25]

解决方式

   加入依赖

        <dependency>
            <groupId>com.alibaba.nacos</groupId>
            <artifactId>nacos-client</artifactId>
            <version>2.0.2</version>
        </dependency>