@hata its a conflict with the anomaly plugin you are using. quick solution is to recompile the anom plugin without the "Megablock.cs" file.
Your everyday B1rdY coming and going as usual ;)
The link explains it all perfectly. in your case you need to add <HEADERS(X-Xsrf-Token)> to your actual headers. don't need to parse it. As ruri said
"After a REQUEST block, the dictionary variables COOKIES and HEADERS, are automatically filled with keys and values received from the server."