apollo-core/src/main/java/com/ctrip/framework/apollo/core/internals/LegacyMetaServerProvider.java/LegacyMetaServerProvider/initialize
class LegacyMetaServerProvider:  private void initialize() {
    Properties prop = new Properties();
    prop = ResourceUtils.readConfigFile("apollo-env.properties", prop);

    domains.put(Env.LOCAL, getMetaServerAddress(prop, "local_meta", "local.meta"));
    domains.put(Env.DEV, getMetaServerAddress(prop, "dev_meta", "dev.meta"));
    domains.put(Env.FAT, getMetaServerAddress(prop, "fat_meta", "fat.meta"));
    domains.put(Env.UAT, getMetaServerAddress(prop, "uat_meta", "uat.meta"));
    domains.put(Env.LPT, getMetaServerAddress(prop, "lpt_meta", "lpt.meta"));
    domains.put(Env.PRO, getMetaServerAddress(prop, "pro_meta", "pro.meta"));
  }