dubbo-metadata/dubbo-metadata-report-nacos/src/main/java/org/apache/dubbo/metadata/store/nacos/NacosMetadataReport.java [166:177]:
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    private void setServerAddr(URL url, Properties properties) {
        StringBuilder serverAddrBuilder = new StringBuilder(url.getHost()) // Host
                .append(':')
                .append(url.getPort()); // Port
        // Append backup parameter as other servers
        String backup = url.getParameter(BACKUP_KEY);
        if (backup != null) {
            serverAddrBuilder.append(',').append(backup);
        }
        String serverAddr = serverAddrBuilder.toString();
        properties.put(SERVER_ADDR, serverAddr);
    }
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dubbo-configcenter/dubbo-configcenter-nacos/src/main/java/org/apache/dubbo/configcenter/support/nacos/NacosDynamicConfiguration.java [170:182]:
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    private void setServerAddr(URL url, Properties properties) {
        StringBuilder serverAddrBuilder = new StringBuilder(url.getHost()) // Host
                .append(':')
                .append(url.getPort()); // Port

        // Append backup parameter as other servers
        String backup = url.getParameter(BACKUP_KEY);
        if (backup != null) {
            serverAddrBuilder.append(',').append(backup);
        }
        String serverAddr = serverAddrBuilder.toString();
        properties.put(SERVER_ADDR, serverAddr);
    }
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