Adding header to action request and response

Question

How can I add a HTTP header to all action calls in ASP.NET MVC. Looking at the IActionFilter but could I interact with the HttpRequestMessage instance if I was to use it?

Answer 1

In your IActionFilter, you provide the OnActionExecuted method where you could do something like this:

void OnActionExecuted(ActionExecutedContext filterContext)
{
    filterContext.HttpContext.Response.Headers.Add("Header-Name", "HeaderValue");
}