e> is a <a href="dart-core/String-class.html">String</a>, <a href="dart-io/RawSecureServerSocket/bind.html">bind</a> will
perform a <a href="dart-io/InternetAddress/lookup.html">InternetAddress.lookup</a> and use the first value in the
list. To listen on the loopback adapter, which will allow only
incoming connections from the local host, use the value
<a href="dart-io/InternetAddress/loopbackIPv4.html">InternetAddress.loopbackIPv4</a> or
<a href="dart-io/InternetAddress/loopbackIPv6.html">InternetAddress.l