--- a/stress-tester/src/main/java/com/passus/st/filter/HttpMessageHeaderValueExtractor.java	Fri Oct 13 14:44:36 2017 +0200
+++ b/stress-tester/src/main/java/com/passus/st/filter/HttpMessageHeaderValueExtractor.java	Fri Oct 13 14:46:44 2017 +0200
@@ -2,6 +2,7 @@
 
 import com.passus.data.ByteString;
 import com.passus.filter.ValueExtractor;
+import com.passus.st.ParametersBag;
 import com.passus.st.client.http.filter.HttpMessageWrapper;
 import java.util.Objects;
 import java.util.regex.Matcher;
@@ -17,11 +18,13 @@
     static final Pattern REQ_HEADER_FUN = Pattern.compile("req\\.getHeader\\(.*'(.*)'\\)");
     static final Pattern RESP_COOKIE_FUN = Pattern.compile("resp\\.getCookie\\(.*'(.*)'\\)");
     static final Pattern RESP_HEADER_FUN = Pattern.compile("resp\\.getHeader\\(.*'(.*)'\\)");
+    static final Pattern HTTP_SESS_FUN = Pattern.compile("httpSession\\.get\\(.*'(.*)'\\)");
 
     static final String REQ_COOKIE_SF = "req.cookie@";
     static final String REQ_HEADER_SF = "req.header@";
     static final String RESP_COOKIE_SF = "resp.cookie@";
     static final String RESP_HEADER_SF = "resp.header@";
+    static final String HTTP_SESSION_SF = "sess@";
 
     static abstract class Operation {
 
@@ -82,6 +85,15 @@
         }
     }
 
+    private static class GetSessionVariable extends Operation {
+
+        @Override
+        public Object extract(HttpMessageWrapper wrapper) {
+            ParametersBag httpSession = wrapper.getHttpSession();
+            return httpSession == null ? null : httpSession.get(name);
+        }
+    }
+
     static Operation createForFunction(String expr) {
         Operation op = null;
         String name;
@@ -97,6 +109,9 @@
         } else if ((name = matchAndExtract(RESP_HEADER_FUN, expr)) != null) {
             op = new GetRespHeaderOperation();
             op.name = name;
+        } else if ((name = matchAndExtract(HTTP_SESS_FUN, expr)) != null) {
+            op = new GetSessionVariable();
+            op.name = name;
         }
         return op;
     }
@@ -115,6 +130,9 @@
         } else if (expr.startsWith(RESP_HEADER_SF)) {
             op = new GetRespHeaderOperation();
             op.name = expr.substring(RESP_HEADER_SF.length());
+        } else if (expr.startsWith(HTTP_SESSION_SF)) {
+            op = new GetSessionVariable();
+            op.name = expr.substring(HTTP_SESSION_SF.length());
         }
         return op;
     }

--- a/stress-tester/src/test/java/com/passus/st/filter/HttpMessageHeaderValueExtractorTest.java	Fri Oct 13 14:44:36 2017 +0200
+++ b/stress-tester/src/test/java/com/passus/st/filter/HttpMessageHeaderValueExtractorTest.java	Fri Oct 13 14:46:44 2017 +0200
@@ -4,6 +4,9 @@
 import com.passus.net.http.HttpRequestBuilder;
 import com.passus.net.http.HttpResponse;
 import com.passus.net.http.HttpResponseBuilder;
+import com.passus.st.client.http.HttpConsts;
+import com.passus.st.client.http.HttpFlowContext;
+import com.passus.st.client.http.HttpScopes;
 import com.passus.st.client.http.filter.HttpMessageWrapper;
 import static com.passus.st.filter.HttpMessageHeaderValueExtractor.*;
 import static org.testng.AssertJUnit.*;
@@ -19,19 +22,29 @@
     private static final String F_REQ_HEADER = "req.getHeader('def')";
     private static final String F_RESP_COOKIE = "resp.getCookie('ghi')";
     private static final String F_RESP_HEADER = "resp.getHeader('jkl')";
+    private static final String F_SESS_VAR = "httpSession.get('mno')";
 
     private static final String S_REQ_COOKIE = "req.cookie@abc";
     private static final String S_REQ_HEADER = "req.header@def";
     private static final String S_RESP_COOKIE = "resp.cookie@ghi";
     private static final String S_RESP_HEADER = "resp.header@jkl";
+    private static final String S_SESS_VAR = "sess@mno";
 
     private static final HttpRequest REQ = HttpRequestBuilder.get("http://www.example.com")
-            .cookie("abc", "1").header("def", "2").build();
+            .cookie("abc", "1").header("def", "2").tag(HttpConsts.TAG_SESSION_ID, "sid").build();
 
     private static final HttpResponse RESP = HttpResponseBuilder.ok()
             .cookie("ghi", "3").header("jkl", "4").build();
 
-    private static final HttpMessageWrapper WRAPPER = new HttpMessageWrapper(REQ, RESP, null);
+    private static final HttpFlowContext CONTEXT;
+
+    static {
+        HttpScopes scopes = new HttpScopes();
+        scopes.getSession("sid").set("mno", "5");
+        CONTEXT = new HttpFlowContext(null, scopes);
+    }
+
+    private static final HttpMessageWrapper WRAPPER = new HttpMessageWrapper(REQ, RESP, CONTEXT);
 
     @Test
     public void testCreateForShortForm() {
@@ -39,6 +52,7 @@
         assertNotNull(createForShortForm(S_REQ_HEADER));
         assertNotNull(createForShortForm(S_RESP_COOKIE));
         assertNotNull(createForShortForm(S_RESP_HEADER));
+        assertNotNull(createForShortForm(S_SESS_VAR));
         assertNull(createForShortForm("req.getVersion()"));
     }
 
@@ -48,6 +62,7 @@
         assertEquals("2", createForShortForm(S_REQ_HEADER).extract(WRAPPER).toString());
         assertEquals("3", createForShortForm(S_RESP_COOKIE).extract(WRAPPER).toString());
         assertEquals("4", createForShortForm(S_RESP_HEADER).extract(WRAPPER).toString());
+        assertEquals("5", createForShortForm(S_SESS_VAR).extract(WRAPPER).toString());
     }
 
     @Test
@@ -64,6 +79,9 @@
         assertEquals("jkl", matchAndExtract(RESP_HEADER_FUN, F_RESP_HEADER));
         assertNotNull(createForFunction(F_RESP_HEADER));
 
+        assertEquals("mno", matchAndExtract(HTTP_SESS_FUN, F_SESS_VAR));
+        assertNotNull(createForFunction(F_SESS_VAR));
+
         assertNull(createForFunction("req.getVersion()"));
     }
 
@@ -73,6 +91,7 @@
         assertEquals("2", createForFunction(F_REQ_HEADER).extract(WRAPPER).toString());
         assertEquals("3", createForFunction(F_RESP_COOKIE).extract(WRAPPER).toString());
         assertEquals("4", createForFunction(F_RESP_HEADER).extract(WRAPPER).toString());
+        assertEquals("5", createForFunction(F_SESS_VAR).extract(WRAPPER).toString());
     }
 
 }