Cannot set headers after they are sent to the client

Warning: already or modify header Need some help with this. So im following a tutorial but im facing this error. js im using mysqli to connect to my mysql BD router. body; if userId! table 'orders'. table 'products'. withFields ['quantity']. quantity - inCart; if data. table 'products'. params. Please be sure to answer the question. Provide details and share your research! But avoid …• Asking...

cannot append header after http headers have been

Sometimes I get exception in my production environment:• Process information• Process ID: 3832• Process name: w3wp. exe• Exception information• Exception type: System. Web. Request information• Request URL:• User host address: 10. User: user001• Is authenticated: True• Authentication Type: Forms• Thread information• Thread ID: 10• Is impersonating: False Stack trace: at System. Web. Web. Web. Mvc. HandleErrorAttribute. OnException ExceptionContext filterContext at System. Web. Mvc. ControllerActionInvoker. InvokeExceptionFilters ControllerContext controllerContext, IList 1 filters, Exception exception at System. Web. Mvc. ControllerActionInvoker. InvokeAction ControllerContext controllerContext, String actionName at System. Web. Mvc. Controller. ExecuteCore at System. Web. Mvc. MvcHandler. Web. Mvc. Async. AsyncResultWrapper. Web. Mvc. Async. AsyncResultWrapper. Web. Mvc. Async. AsyncResultWrapper. WrappedAsyncResult 1. End at System. Web. Mvc. MvcHandler. EndProcessRequest IAsyncResult asyncResult at System. Web. CallHandlerExecutionStep. System. Web. IExecutionStep. Execute at System. Web. I am using ASP. NET MVC 2 Release Candidate 2 I'll broadly agree with Vagrant on the cause:• your action was executing, writing markup to response stream• the stream was unbuffered forcing the response headers to get written before the markup writing could begin. Your view encountered a runtime error• Exception handler kicks... Node returned data error Cannot set headers after they are sent to the client

"Cannot set head