diff --git a/src/main/java/org/appng/tomcat/session/hazelcast/HazelcastSession.java b/src/main/java/org/appng/tomcat/session/hazelcast/HazelcastSession.java
index 3ee619c..5e44dd3 100644
--- a/src/main/java/org/appng/tomcat/session/hazelcast/HazelcastSession.java
+++ b/src/main/java/org/appng/tomcat/session/hazelcast/HazelcastSession.java
@@ -78,13 +78,18 @@ public void setClean() {
 	}
 
 	public SessionData serialize() throws IOException {
+		return serialize(null);
+	}
+
+	public SessionData serialize(String alternativeSiteName) throws IOException {
 		try (ByteArrayOutputStream bos = new ByteArrayOutputStream();
 				ObjectOutputStream oos = new ObjectOutputStream(bos)) {
 			setClean();
 			writeObjectData(oos);
 			oos.flush();
 			bos.flush();
-			return new SessionData(getId(), Utils.getSiteName(this), bos.toByteArray());
+			String siteName = null == alternativeSiteName ? Utils.getSiteName(this) : alternativeSiteName;
+			return new SessionData(getId(), siteName, bos.toByteArray());
 		}
 	}
 
diff --git a/src/main/java/org/appng/tomcat/session/hazelcast/v2/HazelcastManager.java b/src/main/java/org/appng/tomcat/session/hazelcast/v2/HazelcastManager.java
index cd55387..3e8ae91 100644
--- a/src/main/java/org/appng/tomcat/session/hazelcast/v2/HazelcastManager.java
+++ b/src/main/java/org/appng/tomcat/session/hazelcast/v2/HazelcastManager.java
@@ -80,7 +80,11 @@ public HazelcastSession createSession(String sessionId) {
 		return (HazelcastSession) super.createSession(sessionId);
 	}
 
-	public boolean commit(Session session) throws IOException {
+	boolean commit(Session session) throws IOException {
+		return commit(session, null);
+	}
+
+	boolean commit(Session session, String alternativeSiteName) throws IOException {
 		HazelcastSession hzSession = HazelcastSession.class.cast(session);
 		long start = System.currentTimeMillis();
 		SessionData currentSessionData = null;
diff --git a/src/main/java/org/appng/tomcat/session/hazelcast/v2/HazelcastSessionTrackerValve.java b/src/main/java/org/appng/tomcat/session/hazelcast/v2/HazelcastSessionTrackerValve.java
index 93489a3..ccabff2 100644
--- a/src/main/java/org/appng/tomcat/session/hazelcast/v2/HazelcastSessionTrackerValve.java
+++ b/src/main/java/org/appng/tomcat/session/hazelcast/v2/HazelcastSessionTrackerValve.java
@@ -35,8 +35,8 @@
 public class HazelcastSessionTrackerValve extends ValveBase {
 
 	private final Log log = Utils.getLog(HazelcastSessionTrackerValve.class);
-
 	protected Pattern filter = Pattern.compile("^(/template/.*)|((/health)(\\?.*)?)$");
+	protected String siteNameHeader = "x-appng-site";
 
 	@Override
 	public void invoke(Request request, Response response) throws IOException, ServletException {
@@ -47,7 +47,7 @@ public void invoke(Request request, Response response) throws IOException, Servl
 			if (commitRequired(request.getDecodedRequestURI()) && null != session) {
 				long start = System.currentTimeMillis();
 				HazelcastManager manager = (HazelcastManager) request.getContext().getManager();
-				boolean committed = manager.commit(session);
+				boolean committed = manager.commit(session, request.getHeader(siteNameHeader));
 				if (log.isDebugEnabled()) {
 					log.debug(String.format("Handling session %s for %s took %dms (committed: %s)", session.getId(),
 							request.getServletPath(), System.currentTimeMillis() - start, committed));
@@ -60,6 +60,14 @@ protected boolean commitRequired(String uri) {
 		return null == filter || !filter.matcher(uri).matches();
 	}
 
+	public String getSiteNameHeader() {
+		return siteNameHeader;
+	}
+
+	public void setSiteNameHeader(String siteNameHeader) {
+		this.siteNameHeader = siteNameHeader;
+	}
+
 	public String getFilter() {
 		return null == filter ? null : filter.toString();
 	}