Duplicate headers seen in HTTP response despite the modify or remove headers behavior is applied in delivery configuration.
AntiForgeryTokenOrchard Server cannot modify cookies after HTTP headers have been sent. · Issue #4676 · OrchardCMS/Orchard · GitHub
![Html.AntiForgeryToken throws error “Server cannot modify cookies after HTTP headers have been sent” after fresh Visual Studio install - Stack Overflow 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)
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
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
Sitecore error “Server cannot modify cookies after HTTP headers have been sent.” - Sitecore Community
Server cannot modify cookies after HTTP headers have been sent" error with SignalR · Issue #6 · Sustainsys/owin-cookie-saver · GitHub
![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)