Add a custom response header in ApiController

Question

Until now, I had a GET method that looked like the following:

protected override async Task GetAll(QueryData query)
{
              


        

Answer 1

You can use a custom ActionFilter that will allow you to send custom headers and access the HttpContext:

public class AddCustomHeaderFilter : ActionFilterAttribute
{
    public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)
    {
       actionExecutedContext.Response.Content.Headers.Add("name", "value");
    }
}