--- a/stress-tester/src/main/java/com/passus/st/client/http/filter/HttpCsrfFormFilter.java	Tue Aug 08 13:29:37 2017 +0200
+++ b/stress-tester/src/main/java/com/passus/st/client/http/filter/HttpCsrfFormFilter.java	Tue Aug 08 14:41:43 2017 +0200
@@ -54,7 +54,16 @@
     private final HttpMessageHelper helper = new HttpMessageHelper(); // needs instance, because header decoders are not thread safe
 
     private String inputName;
-    private final Set<ByteString> contentTypesToScan = CONTENT_TYPES_TO_SCAN.stream().map(ByteString::create).collect(Collectors.toSet());
+    private final Set<ByteString> contentTypesToScan;
+
+    public HttpCsrfFormFilter() {
+        contentTypesToScan = CONTENT_TYPES_TO_SCAN.stream().map(ByteString::create).collect(Collectors.toSet());
+    }
+
+    public HttpCsrfFormFilter(String inputName, Set<ByteString> contentTypesToScan) {
+        this.inputName = inputName;
+        this.contentTypesToScan = new HashSet<>(contentTypesToScan);
+    }
 
     String getInputName() {
         return inputName;
@@ -76,7 +85,10 @@
     @Override
     public void configure(Configuration config) {
         setInputName((String) config.get("inputName"));
-        setContentTypesToScan((Collection) config.get("contentTypesToScan"));
+        Object types = config.get("contentTypesToScan");
+        if (types != null) {
+            setContentTypesToScan((Collection) types);
+        }
     }
 
     @Override
@@ -96,6 +108,8 @@
                             parameters.set(inputName, entry.value);
                             helper.setFormUrlencoded(request, parameters);
                             LOGGER.debug("Token inserted.");
+                        } else {
+                            LOGGER.debug("Could not find request parameter {}", parameters);
                         }
                     } catch (IOException ex) {
                         LOGGER.debug("Could not decode request.");
@@ -149,7 +163,7 @@
 
     @Override
     public HttpCsrfFormFilter instanceForWorker(int index) {
-        return new HttpCsrfFormFilter();
+        return new HttpCsrfFormFilter(inputName, contentTypesToScan);
     }
 
     public static class NodeDefCreator implements NodeDefinitionCreator {