public long getConnectedAt(TimeUnit unit) {
        return unit.convert(connectedAt, TimeUnit.MILLISECONDS);
    }
<p>For server requests, this returns the timestamp of when the underlying HTTP channel was connected.

<p>For client requests, this returns the same value as {@link #creationTime(java.util.concurrent.TimeUnit)}.</p>

@param unit the unit to return the time in
@return the timestamp of when the underlying HTTP channel was connected, or request creation time
container-core/src/main/java/com/yahoo/jdisc/http/HttpRequest.java