public String getProtocol() {
        return this.protocol;
    }
<p>
The protocol to inspect for. To inspector for all protocols, use <code>IP</code>.
</p>

@return The protocol to inspect for. To inspector for all protocols, use <code>IP</code>.
aws-java-sdk-securityhub/src/main/java/com/amazonaws/services/securityhub/model/RuleGroupSourceStatefulRulesHeaderDetails.java