Url redirection on OnActionExecuting method

Question

We are trying to implement a non-hosted header that will accept anything before *.website.com in ASP.NET. Since it will accept any subdomain, we extended the HttpContextBase class to add custom method.

public static bool ValidateHost(this HttpContextBase context)
{
    var domain = context.Request.Url.Host;

    //add logic to check if the host is valid and the subdomain exist in the database

    return false;
}

This method will validate whether the context.Url.Host is a valid host or its subdomain exist in the database if not then redirect the request to the default host website.com. To do that I added this line of codes below in our BaseController:

protected override void OnActionExecuting(ActionExecutingContext filterContext)
{
    if (!filterContext.HttpContext.ValidateUrl())
    {
        filterContext.HttpContext.Response.Redirect("https://website.com/");
        return;
    }
}

It redirects to default host whenever it returns false, however it throws an exception: {"Server cannot append header after HTTP headers have been sent."}

Am I missing something here or the logic is incomplete?

score 3 · Accepted Answer · answered Apr 19 '16 at 06:17

3

Try RedirectResult

filterContext.Result = new RedirectResult("https://website.com");

answered Apr 19 '16 at 06:17

Bon Macalindong

1,310
13
20

score 1 · Answer 2 · answered Apr 19 '16 at 06:19

1

In HTTP there is always single response for each request. So this error means that you've already send something to response and again you are requesting for other URL.

answered Apr 19 '16 at 06:19

Rahul Nikate

6,192
5
42
54

Url redirection on OnActionExecuting method

2 Answers2