public boolean getLocalProxyListFromFile(String filePath, ProcessResult procResult) {
        String strRet;
        try {
            byte[] fileBytes = Files.readAllBytes(Paths.get(filePath));
            strRet = new String(fileBytes);
        } catch (Throwable ex) {
            return procResult.setFailResult(ErrorCode.READ_LOCAL_FILE_FAILURE,
                    "Read local configure failure from "
                            + filePath + ", reason is " + ex.getMessage());
        }
        if (StringUtils.isBlank(strRet)) {
            return procResult.setFailResult(ErrorCode.BLANK_FILE_CONTENT,
                    "Blank configure local file from " + filePath);
        }
        return getProxyConfigEntry(false, strRet, procResult);
    }
request proxyHost list from manager, update ClientMgr.proxyHostList and channels

@throws Exception
inlong-sdk/dataproxy-sdk/src/main/java/org/apache/inlong/sdk/dataproxy/config/ProxyConfigManager.java