Server domain name if available without reverse DNS lookup; otherwise, IP address or Unix domain socket name.
Example
example.com
Example
10.1.2.80
Example
/tmp/my.sock
Note
When observed from the client side, and when communicating through an intermediary, server.addressSHOULD represent the server address behind any intermediaries, for example proxies, if it's available.
Server domain name if available without reverse DNS lookup; otherwise, IP address or Unix domain socket name.