public String getProtocolVersion() {
        return this.protocolVersion;
    }
<p>
The protocol version. The default is <code>HTTP1</code>. Not supported if the target group type is
<code>LAMBDA</code>.
</p>

@return The protocol version. The default is <code>HTTP1</code>. Not supported if the target group type is
        <code>LAMBDA</code>.
@see TargetGroupProtocolVersion
aws-java-sdk-vpclattice/src/main/java/com/amazonaws/services/vpclattice/model/TargetGroupConfig.java