public Builder setUnixDomainSocket(final Path unixDomainSocket) {
            this.unixDomainSocket = unixDomainSocket;
            return this;
        }
Sets the Unix Domain Socket path to use for the connection.
<p>
When set, the connection will use the specified Unix Domain Socket
instead of a TCP socket. This is useful for communicating with local
services like Docker or systemd.
</p>
<p>
Default: {@code null}
</p>

@return this instance.
@since 5.6
httpclient5/src/main/java/org/apache/hc/client5/http/config/RequestConfig.java