/// <summary>
/// return true to put request on hold (until call to Signal()) - return false to allow pipeline to execute immediately
/// </summary>
/// <param name="httpApplication"></param>
/// <returns></returns>
public static bool DoBeginRequest(HttpApplication httpApplication)
{
// use the url as it was requested by the client
// the real url might be different if it has been translated (proxy, load balancing, ...)
var url = ToUrlString(httpApplication.Request);
var virtualFileCopy = WarmupUtility.EncodeUrl(url.Trim('/'));
var localCopy = Path.Combine(HostingEnvironment.MapPath(WarmupFilesPath), virtualFileCopy);
if (File.Exists(localCopy))
{
// result should not be cached, even on proxies
httpApplication.Response.Cache.SetExpires(DateTime.UtcNow.AddDays(-1));
httpApplication.Response.Cache.SetValidUntilExpires(false);
httpApplication.Response.Cache.SetRevalidation(HttpCacheRevalidation.AllCaches);
httpApplication.Response.Cache.SetCacheability(HttpCacheability.NoCache);
httpApplication.Response.Cache.SetNoStore();
httpApplication.Response.WriteFile(localCopy);
httpApplication.Response.End();
return(true);
}
// there is no local copy and the file exists
// serve the static file
if (File.Exists(httpApplication.Request.PhysicalPath))
{
return(true);
}
return(false);
}
private IAsyncResult BeginBeginRequest(object sender, EventArgs e, AsyncCallback cb, object extradata)
{
// host is available, process every requests, or file is processed
if (!InWarmup() || WarmupUtility.DoBeginRequest(_context))
{
var asyncResult = new DoneAsyncResult(extradata);
cb(asyncResult);
return(asyncResult);
}
else
{
// this is the "on hold" execution path
var asyncResult = new WarmupAsyncResult(cb, extradata);
Await(asyncResult.Completed);
return(asyncResult);
}
}