/// <summary>
/// Event handler that gets triggered just before the ASP.NET Request Handler gets executed.
/// </summary>
/// <param name="sender">The <see cref="HttpApplication"/> sending the event.</param>
/// <param name="eventArgs">The event arguments.</param>
private static void OnPreRequestHandlerExecute(object sender, EventArgs eventArgs)
{
HttpApplication application = (HttpApplication)sender;
HttpContext context = application.Context;
HttpRequest request = context.Request;
HttpResponse response = context.Response;
string urlPath = request.Url.AbsolutePath;
DateTime ifModifiedSince = Convert.ToDateTime(request.Headers["If-Modified-Since"]);
using (new Tracer(sender, eventArgs, urlPath, ifModifiedSince))
{
Localization localization = WebRequestContext.Localization;
string staticsRootUrl = SiteConfiguration.GetLocalStaticsUrl(localization.LocalizationId);
urlPath = urlPath.StartsWith("/" + staticsRootUrl) ? urlPath.Substring(staticsRootUrl.Length + 1) : urlPath;
if (!localization.IsStaticContentUrl(urlPath))
{
// Not a static content item; continue the HTTP pipeline.
return;
}
try
{
using (StaticContentItem staticContentItem = SiteConfiguration.ContentProvider.GetStaticContentItem(urlPath, localization))
{
DateTime lastModified = staticContentItem.LastModified;
if (lastModified <= ifModifiedSince.AddSeconds(1))
{
Log.Debug("Static content item last modified at {0} => Sending HTTP 304 (Not Modified).", lastModified);
response.StatusCode = (int)HttpStatusCode.NotModified;
response.SuppressContent = true;
}
else
{
// Items with a versioned URL can be cached long-term, because the URL will change if needed.
bool isVersionedUrl = context.Items.Contains(IsVersionedUrlContextItem);
TimeSpan maxAge = isVersionedUrl ? new TimeSpan(7, 0, 0, 0) : new TimeSpan(0, 1, 0, 0); // 1 Week or 1 Hour
response.Cache.SetLastModified(lastModified); // Allows the browser to do an If-Modified-Since request next time
response.Cache.SetCacheability(HttpCacheability.Public); // Allow caching
response.Cache.SetMaxAge(maxAge);
response.Cache.SetExpires(DateTime.UtcNow.Add(maxAge));
response.ContentType = staticContentItem.ContentType;
staticContentItem.GetContentStream().CopyTo(response.OutputStream);
}
}
}
catch (DxaItemNotFoundException ex)
{
SendNotFoundResponse(ex.Message, response);
}
catch (Exception ex)
{
// Other exceptions: log and let ASP.NET handle them
Log.Error(ex);
throw;
}
// Terminate the HTTP pipeline.
application.CompleteRequest();
}
}
/// <summary>
/// Event handler that gets triggered just before the ASP.NET Request Handler gets executed.
/// </summary>
/// <param name="sender">The <see cref="HttpApplication"/> sending the event.</param>
/// <param name="eventArgs">The event arguments.</param>
private static void OnPreRequestHandlerExecute(object sender, EventArgs eventArgs)
{
HttpApplication application = (HttpApplication)sender;
HttpContext context = application.Context;
HttpRequest request = context.Request;
HttpResponse response = context.Response;
string urlPath = request.Url.AbsolutePath;
DateTime ifModifiedSince = Convert.ToDateTime(request.Headers["If-Modified-Since"]);
using (new Tracer(sender, eventArgs, urlPath, ifModifiedSince))
{
Localization localization = WebRequestContext.Localization;
string staticsRootUrl = SiteConfiguration.GetLocalStaticsUrl(localization.LocalizationId);
urlPath = urlPath.StartsWith("/" + staticsRootUrl) ? urlPath.Substring(staticsRootUrl.Length + 1) : urlPath;
if (!localization.IsStaticContentUrl(urlPath))
{
// Not a static content item; continue the HTTP pipeline.
return;
}
try
{
using (StaticContentItem staticContentItem = SiteConfiguration.ContentProvider.GetStaticContentItem(urlPath, localization))
{
DateTime lastModified = staticContentItem.LastModified;
if (lastModified < ifModifiedSince)
{
Log.Debug("Static content item last modified at {0} => Sending HTTP 304 (Not Modified).", lastModified);
response.StatusCode = (int)HttpStatusCode.NotModified;
response.SuppressContent = true;
}
else
{
response.ContentType = staticContentItem.ContentType;
staticContentItem.GetContentStream().CopyTo(response.OutputStream);
}
}
}
catch (DxaItemNotFoundException ex)
{
SendNotFoundResponse(ex.Message, response);
}
// Terminate the HTTP pipeline.
application.CompleteRequest();
}
}
