返回远程 IP 地址的字符串表示形式。 例如,'74.125.127.100' 或 '2001:4860:a005::68'。
'74.125.127.100'
'2001:4860:a005::68'
Returns the string representation of the remote IP address. For example, '74.125.127.100' or '2001:4860:a005::68'.