| 이름 | 설명 |
|---|---|
| ConnectionRefusedException | Use this exception when an IO operation that requires a distant connection is refused as you are negotiating the connection with the external resource. |
| UnexpectedResponseException | Use this exception when an IO operation based on a communication protocol receives an unexpected response from the remote host. |
| UnknownHostException | Use this exception when an IO operation tries to reach a remote host that cannot be resolved due to DNS or IP issues. |