milamberspace commented on code in PR #727:
URL: https://github.com/apache/jmeter/pull/727#discussion_r1190771749


##########
src/protocol/http/src/main/java/org/apache/jmeter/protocol/http/control/HeaderManager.java:
##########
@@ -57,9 +58,19 @@ public HeaderManager() {
         setProperty(new CollectionProperty(HEADERS, new ArrayList<>()));
     }
 
+    private void assertMutable() {
+        if (isRunningVersion()) {
+            throw new IllegalStateException(
+                    "Cannot modify HeaderManager " + getName() + " while test 
is running. " +
+                            "If you need dynamic headers, prefer using ${...} 
expressions in your headers."

Review Comment:
   @vlsi probably better to use JMeter functions than "${...} expressions", 
because in JMeter's manuel the terms is JMeter functions and variables 
https://jmeter.apache.org/usermanual/functions.html



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