服务器代表一个 Undertow 实例并由几个元素组成:
host 元素提供虚拟主机配置,而三个 listener 元素则提供到 Undertow 实例的不同类型的连接。
Note
Multiple servers may be configured, which allow deployments and servers to be completely isolated. This may be useful in certain scenarios such as multi-tenant environments.