Can gzip compression be selectively disabled in ASP.NET/IIS 7?

@Aristos’ answer will work for WebForms, but with his help, I’ve adapted a solution more inline with ASP.NET/MVC methodology.

Create a new filter to provide the gzipping functionality:

public class GzipFilter : ActionFilterAttribute
{
    public override void OnActionExecuted(ActionExecutedContext filterContext)
    {
        base.OnActionExecuted(filterContext);

        var context = filterContext.HttpContext;
        if (filterContext.Exception == null && 
            context.Response.Filter != null &&
            !filterContext.ActionDescriptor.IsDefined(typeof(NoGzipAttribute), true))
        {
            string acceptEncoding = context.Request.Headers["Accept-Encoding"].ToLower();;

            if (acceptEncoding.Contains("gzip"))
            {
                context.Response.Filter = new GZipStream(context.Response.Filter, CompressionMode.Compress);
                context.Response.AppendHeader("Content-Encoding", "gzip");
            }                       
            else if (acceptEncoding.Contains("deflate"))
            {
                context.Response.Filter = new DeflateStream(context.Response.Filter, CompressionMode.Compress);
                context.Response.AppendHeader("Content-Encoding", "deflate");
            } 
        }
    }
}

Create the NoGzip attribute:

public class NoGzipAttribute : Attribute {
}

Prevent IIS7 from gzipping using web.config:

<system.webServer>
    ...
    <urlCompression doStaticCompression="true" doDynamicCompression="false" />
</system.webServer>

Register your global filter in Global.asax.cs:

protected void Application_Start()
{
    ...
    GlobalFilters.Filters.Add(new GzipFilter());
}

Finally, consume the NoGzip attribute:

public class MyController : AsyncController
{
    [NoGzip]
    [NoAsyncTimeout]
    public void GetProgress(int id)
    {
        AsyncManager.OutstandingOperations.Increment();
        ...
    }

    public ActionResult GetProgressCompleted() 
    {
        ...
    }
}

P.S. Once again, many thanks to @Aristos, for his helpful idea and solution.