![c# - Html.AntiForgeryToken throws error “Server cannot modify cookies after HTTP headers have been sent” after fresh Visual Studio install - Stack Overflow c# - Html.AntiForgeryToken throws error “Server cannot modify cookies after HTTP headers have been sent” after fresh Visual Studio install - Stack Overflow](https://i.stack.imgur.com/2rIUn.jpg)
c# - Html.AntiForgeryToken throws error “Server cannot modify cookies after HTTP headers have been sent” after fresh Visual Studio install - Stack Overflow
![wffm - Sitecore error "Server cannot modify cookies after HTTP headers have been sent." - Sitecore Stack Exchange wffm - Sitecore error "Server cannot modify cookies after HTTP headers have been sent." - Sitecore Stack Exchange](https://i.stack.imgur.com/nmjah.png)
wffm - Sitecore error "Server cannot modify cookies after HTTP headers have been sent." - Sitecore Stack Exchange
Duplicate headers seen in HTTP response despite the modify or remove headers behavior is applied in delivery configuration.
Sitecore error “Server cannot modify cookies after HTTP headers have been sent.” - Sitecore Community
![server cannot modify cookies after http headers have been sent – Sitecore Genie – Himanshu Agarwal's blog server cannot modify cookies after http headers have been sent – Sitecore Genie – Himanshu Agarwal's blog](https://sitecoregenie.files.wordpress.com/2018/09/servercookie.png?w=640)