I'd like to add a header to the 500 Internal Server Error page

I'm using ASP.NET MVC, and my application works mostly using JSON queries.

If something goes wrong on the server-side, I get the standard "500 Internal Server Error" page. That's actually fine. But I'd like to add one more field in the response headers : the Exception's Message.

My idea was to add this override in the controller :

protected override void OnException(ExceptionContext开发者_JS百科 filterContext)
    {
        base.OnException(filterContext);
        filterContext.RequestContext.HttpContext.Response.AppendHeader("Exception", filterContext.Exception.Message);
        filterContext.RequestContext.HttpContext.Response.TrySkipIisCustomErrors = true;
    }

Unfortunately, I don't get the new field in the response headers.

However, if do this on my controller's methods, it works:

try
{
}
catch (Exception ex)
{
    Response.Headers.Add("Exception", ex.Message);
    Response.StatusCode = (int)HttpStatusCode.InternalServerError;
    return Content(ex.Message);
}

It works, but it's not very neat. Is there a way I can do this easily? Thanks!

Try enabling custom errors in your web.config:

<system.web>
    <customErrors mode="On" />
</system.web>

This will render the standard error view ~/Views/Shared/Error.aspx and your custom header will be appended to the response.

Also you could use filterContext.HttpContext.Response instead of filterContext.RequestContext.HttpContext.Response. It points to the same object, it's just that it makes a little more sense.