/// <summary>
/// This will make the browser and server keep the output
/// in its cache and thereby improve performance.
/// </summary>
private void SetHeadersAndCache(string file, HttpContext context)
{
//string ext = file.Substring(file.LastIndexOf(".")).ToString().ToLower();
//TimeSpan maxAge = new TimeSpan(3, 0, 0, 0);
//context.Response.Cache.SetMaxAge(maxAge);
//context.Response.AddFileDependency(file);
//context.Response.Cache.SetCacheability(HttpCacheability.Public);
//context.Response.Cache.VaryByParams["path"] = true;
//context.Response.Cache.SetETagFromFileDependencies();
//context.Response.Cache.SetExpires(DateTime.Now.AddDays(3));
//context.Response.Expires = 86400000;
//context.Response.Cache.AppendCacheExtension("must-revalidate, proxy-revalidate");
//context.Response.Cache.SetETag(string.Empty);
//context.Response.Cache.SetLastModifiedFromFileDependencies();
HttpResponse response = context.Response;
TimeSpan duration = TimeSpan.FromDays(3);
HttpCachePolicy cache = response.Cache;
cache.SetCacheability(HttpCacheability.Public);
cache.SetExpires(DateTime.Now.Add(duration));
cache.SetMaxAge(duration);
cache.AppendCacheExtension("must-revalidate, proxy-revalidate");
FieldInfo maxAgeField = cache.GetType().GetField("_maxAge", BindingFlags.Instance | BindingFlags.NonPublic);
maxAgeField.SetValue(cache, duration);
}
/// <summary>
/// Sets the output cache parameters and also the client side caching parameters
/// </summary>
/// <param name="context"></param>
private void SetCaching(HttpContext context, string fileName)
{
//This ensures OutputCaching is set for this handler and also controls
//client side caching on the browser side. Default is 10 days.
TimeSpan duration = TimeSpan.FromDays(10);
HttpCachePolicy cache = context.Response.Cache;
cache.SetCacheability(HttpCacheability.Public);
cache.SetExpires(DateTime.Now.Add(duration));
cache.SetMaxAge(duration);
cache.SetValidUntilExpires(true);
cache.SetLastModified(DateTime.Now);
cache.SetETag(Guid.NewGuid().ToString());
//set server OutputCache to vary by our params
cache.VaryByParams["t"] = true;
cache.VaryByParams["s"] = true;
//don't allow varying by wildcard
cache.SetOmitVaryStar(true);
//ensure client browser maintains strict caching rules
cache.AppendCacheExtension("must-revalidate, proxy-revalidate");
//This is the only way to set the max-age cachability header in ASP.Net!
FieldInfo maxAgeField = cache.GetType().GetField("_maxAge", BindingFlags.Instance | BindingFlags.NonPublic);
maxAgeField.SetValue(cache, duration);
//make this output cache dependent on the file if there is one.
if (!string.IsNullOrEmpty(fileName))
{
context.Response.AddFileDependency(fileName);
}
}
public virtual void SetResponseCachePolicy
(HttpCachePolicy cache)
{
cache.SetCacheability(HttpCacheability.NoCache);
cache.SetNoStore();
cache.SetExpires(DateTime.MinValue);
}
/// <summary>
/// This will make the browser and server keep the output
/// in its cache and thereby improve performance.
/// </summary>
/// <param name="context">
/// the <see cref="T:System.Web.HttpContext">HttpContext</see> object that provides
/// references to the intrinsic server objects
/// </param>
/// <param name="responseType">
/// The HTTP MIME type to send.
/// </param>
/// <param name="dependencyPaths">
/// The dependency path for the cache dependency.
/// </param>
private void SetHeaders(HttpContext context, string responseType, IEnumerable <string> dependencyPaths)
{
HttpResponse response = context.Response;
response.ContentType = responseType;
if (response.Headers["Image-Served-By"] == null)
{
response.AddHeader("Image-Served-By", "ImageProcessor.Web/" + AssemblyVersion);
}
HttpCachePolicy cache = response.Cache;
cache.SetCacheability(HttpCacheability.Public);
cache.VaryByHeaders["Accept-Encoding"] = true;
context.Response.AddFileDependencies(dependencyPaths.ToArray());
cache.SetLastModifiedFromFileDependencies();
int maxDays = DiskCache.MaxFileCachedDuration;
cache.SetExpires(DateTime.Now.ToUniversalTime().AddDays(maxDays));
cache.SetMaxAge(new TimeSpan(maxDays, 0, 0, 0));
cache.SetRevalidation(HttpCacheRevalidation.AllCaches);
context.Items[CachedResponseTypeKey] = null;
context.Items[CachedResponseFileDependency] = null;
}
/// <summary>
/// This will make the browser and server keep the output
/// in its cache and thereby improve performance.
/// </summary>
/// <param name="context">
/// the <see cref="T:System.Web.HttpContext">HttpContext</see> object that provides
/// references to the intrinsic server objects
/// </param>
/// <param name="responseType">
/// The HTTP MIME type to send.
/// </param>
/// <param name="dependencyPaths">
/// The dependency path for the cache dependency.
/// </param>
private void SetHeaders(HttpContext context, string responseType, IEnumerable <string> dependencyPaths)
{
if (this.imageCache != null)
{
HttpResponse response = context.Response;
if (response.Headers["ImageProcessedBy"] == null)
{
response.AddHeader("ImageProcessedBy", "ImageProcessor.Web/" + AssemblyVersion);
}
HttpCachePolicy cache = response.Cache;
cache.SetCacheability(HttpCacheability.Public);
cache.VaryByHeaders["Accept-Encoding"] = true;
if (!string.IsNullOrWhiteSpace(responseType))
{
response.ContentType = responseType;
}
if (dependencyPaths != null)
{
context.Response.AddFileDependencies(dependencyPaths.ToArray());
cache.SetLastModifiedFromFileDependencies();
}
int maxDays = this.imageCache.MaxDays;
cache.SetExpires(DateTime.Now.ToUniversalTime().AddDays(maxDays));
cache.SetMaxAge(new TimeSpan(maxDays, 0, 0, 0));
cache.SetRevalidation(HttpCacheRevalidation.AllCaches);
this.imageCache = null;
}
}
/// <summary>设置缓存策略（使用context.Response.Cache来缓存输出）</summary>
/// <remarks>
/// ashx 的页面缓存不允许写语句：<%@ OutputCache Duration="60" VaryByParam="*" %>
/// 故可直接调用本方法实现缓存。
/// 参考：https://stackoverflow.com/questions/1109768/how-to-use-output-caching-on-ashx-handler
/// </remarks>
public static void SetCachePolicy(this HttpResponse response, int cacheSeconds, string varyByParam = "*", HttpCacheability cacheLocation = HttpCacheability.ServerAndPrivate)
{
HttpCachePolicy cachePolicy = response.Cache;
if (cacheSeconds > 0)
{
cachePolicy.SetCacheability(cacheLocation);
cachePolicy.SetExpires(DateTime.Now.AddSeconds((double)cacheSeconds));
cachePolicy.SetSlidingExpiration(false);
cachePolicy.SetValidUntilExpires(true);
if (varyByParam.IsNotEmpty())
{
cachePolicy.VaryByParams[varyByParam] = true;
}
else
{
cachePolicy.VaryByParams.IgnoreParams = true;
}
}
else
{
cachePolicy.SetCacheability(HttpCacheability.NoCache);
cachePolicy.SetMaxAge(TimeSpan.Zero);
}
}
/// <summary>
/// This will make the browser and server keep the output
/// in its cache and thereby improve performance.
/// See http://en.wikipedia.org/wiki/HTTP_ETag
/// </summary>
/// <param name="context">
/// the <see cref="T:System.Web.HttpContext">HttpContext</see> object that provides
/// references to the intrinsic server objects
/// </param>
/// <param name="responseType">The HTTP MIME type to to send.</param>
private void SetHeaders(HttpContext context, string responseType)
{
HttpResponse response = context.Response;
response.ContentType = responseType;
response.AddHeader("Image-Served-By", "ImageProcessor.Web/" + AssemblyVersion);
HttpCachePolicy cache = response.Cache;
cache.VaryByHeaders["Accept-Encoding"] = true;
int maxDays = DiskCache.MaxFileCachedDuration;
cache.SetExpires(DateTime.Now.ToUniversalTime().AddDays(maxDays));
cache.SetMaxAge(new TimeSpan(maxDays, 0, 0, 0));
cache.SetRevalidation(HttpCacheRevalidation.AllCaches);
string incomingEtag = context.Request.Headers["If-None-Match"];
cache.SetCacheability(HttpCacheability.Public);
if (incomingEtag == null)
{
return;
}
response.Clear();
response.StatusCode = (int)HttpStatusCode.NotModified;
response.SuppressContent = true;
}
private void ProcessDefaultThumbnail()
{
// Generate the default album thumbnail and send to client.
Bitmap bmp = null;
try
{
this._context.Response.ContentType = "image/jpeg";
HttpCachePolicy cachePolicy = this._context.Response.Cache;
cachePolicy.SetExpires(DateTime.Now.AddSeconds(2592000)); // 30 days
cachePolicy.SetCacheability(HttpCacheability.Public);
cachePolicy.SetValidUntilExpires(true);
bmp = GetDefaultThumbnailBitmap();
bmp.Save(_context.Response.OutputStream, ImageFormat.Jpeg);
}
finally
{
if (bmp != null)
{
bmp.Dispose();
}
}
}
private void ProcessMediaObject()
{
// Send the specified file to the client.
try
{
this._context.Response.Clear();
this._context.Response.AddHeader("Content-Disposition", string.Format("inline;filename=\"{0}\"", MakeFileNameDownloadFriendly(Path.GetFileName(MediaObjectFilePath))));
this._context.Response.ContentType = MimeType.FullType;
this._context.Response.Buffer = false;
HttpCachePolicy cachePolicy = this._context.Response.Cache;
cachePolicy.SetExpires(DateTime.Now.AddSeconds(2592000)); // 30 days
cachePolicy.SetCacheability(HttpCacheability.Public);
cachePolicy.SetValidUntilExpires(true);
FileStream fileStream = null;
try
{
byte[] buffer = new byte[_bufferSize];
try
{
fileStream = File.OpenRead(MediaObjectFilePath);
}
catch (ArgumentException) { return; } // If the file or directory isn't found, just return. This helps avoid clogging the error log
catch (FileNotFoundException) { return; } // with entries caused by search engine retrieving media objects that have been moved or deleted.
catch (DirectoryNotFoundException) { return; }
// Required for Silverlight to properly work
this._context.Response.AddHeader("Content-Length", fileStream.Length.ToString(CultureInfo.InvariantCulture));
int byteCount;
while ((byteCount = fileStream.Read(buffer, 0, buffer.Length)) > 0)
{
if (this._context.Response.IsClientConnected)
{
this._context.Response.OutputStream.Write(buffer, 0, byteCount);
this._context.Response.Flush();
}
else
{
return;
}
}
}
finally
{
if (fileStream != null)
{
fileStream.Close();
}
}
}
catch (Exception ex)
{
AppErrorController.LogError(ex);
}
}
private static void SetCache(string path)
{
HttpCachePolicy cache = HttpContext.Current.Response.Cache;
TimeSpan expires = TimeSpan.FromDays(14);
cache.SetExpires(DateTime.Now.Add(expires));
cache.SetMaxAge(expires);
cache.SetLastModified(File.GetLastWriteTime(path));
}
public void ProcessRequest(HttpContext context)
{
string name = context.Request.QueryString["f"];
System.IO.Stream resource;
HttpCachePolicy cache = context.Response.Cache;
// since the same instance is reused, reset these defaults
_canZip = true; _canMinify = false;
if (name == null)
{
return;
}
resource = _assembly.GetManifestResourceStream(
string.Format("{0}.{1}.{2}", _nameSpace, _path, name));
if (resource != null)
{
cache.SetCacheability(HttpCacheability.Public);
cache.VaryByParams["f"] = true;
cache.VaryByParams["t"] = true;
cache.SetExpires(DateTime.Now.AddYears(1));
context.Response.ContentType = this.InferMimeType(name);
if (_canMinify)
{
EcmaScriptMinify em = new EcmaScriptMinify();
em.WriteMinified(resource, context.Response.Output);
}
else
{
byte[] buffer = new byte[1025];
int bytesToWrite = 1;
Stream output;
if (_canZip && _allowZip)
{
context.Response.AddHeader("Content-encoding", "gzip");
output = new GZipStream(context.Response.OutputStream, CompressionMode.Compress);
}
else
{
output = context.Response.OutputStream;
}
while (bytesToWrite > 0)
{
bytesToWrite = resource.Read(buffer, 0, 1024);
output.Write(buffer, 0, bytesToWrite);
}
resource.Dispose();
output.Dispose();
}
}
}
/// <summary>
/// Set the response cache headers for WebResource
/// </summary>
/// <param name="cache"></param>
/// <param name="etag"></param>
/// <param name="maxAge"></param>
protected static void SetCachingHeadersForWebResource(HttpCachePolicy cache, string etag, TimeSpan maxAge)
{
cache.SetCacheability(HttpCacheability.Public);
cache.VaryByParams["d"] = true;
cache.SetOmitVaryStar(true);
cache.SetExpires(DateTime.Now.Add(maxAge));
cache.SetValidUntilExpires(true);
cache.VaryByHeaders["Accept-Encoding"] = true;
cache.SetETag(string.Concat("\"", etag, "\""));
}
/// <summary>设置页面缓存</summary>
/// <param name="context">网页上下文</param>
/// <param name="cacheSeconds">缓存秒数</param>
/// <param name="varyByParam">缓存参数名称</param>
/// <remarks>
/// ashx 的页面缓存不允许写语句：<%@ OutputCache Duration="60" VaryByParam="*" %>
/// 故可直接调用本方法实现缓存。
/// 参考：https://stackoverflow.com/questions/1109768/how-to-use-output-caching-on-ashx-handler
/// </remarks>
public static void SetCache(HttpContext context, int cacheSeconds = 60, HttpCacheability cacheLocation = HttpCacheability.ServerAndPrivate, string varyByParam = "*")
{
TimeSpan ts = new TimeSpan(0, 0, 0, cacheSeconds);
HttpCachePolicy cachePolicy = context.Response.Cache;
cachePolicy.SetCacheability(cacheLocation);
cachePolicy.VaryByParams[varyByParam] = true;
cachePolicy.SetExpires(DateTime.Now.Add(ts));
cachePolicy.SetMaxAge(ts);
cachePolicy.SetValidUntilExpires(true);
}
private static void SetCache(HttpCachePolicy cache)
{
cache.SetCacheability(HttpCacheability.Public);
cache.VaryByParams[_paramV] = true;
cache.VaryByParams[_paramFile] = true;
cache.SetOmitVaryStar(true);
cache.SetValidUntilExpires(true);
cache.SetExpires(DateTime.Now.AddYears(2));
cache.SetLastModified(DateTime.ParseExact(AppConstants.BuildDate,
_dateFormat, CultureInfo.GetCultureInfo(_usCulture).DateTimeFormat));
}
private static void OutputCacheResponse(HttpContext context, DateTime lastModified)
{
HttpCachePolicy cachePolicy = context.Response.Cache;
cachePolicy.SetCacheability(HttpCacheability.Public);
cachePolicy.VaryByParams["*"] = true;
cachePolicy.SetOmitVaryStar(true);
cachePolicy.SetExpires(DateTime.Now + TimeSpan.FromDays(365));
cachePolicy.SetValidUntilExpires(true);
cachePolicy.SetLastModified(lastModified);
}
/// <summary>
/// 缓存
/// </summary>
/// <param name="instance">HttpContext扩展</param>
/// <param name="durationInMinutes">时间</param>
public static void CacheKD(this HttpContext instance, int durationInMinutes)
{
instance.CheckOnNull("instance");
TimeSpan duration = TimeSpan.FromMinutes(durationInMinutes);
HttpCachePolicy cache = instance.Response.Cache;
cache.SetCacheability(HttpCacheability.Public);
cache.SetExpires(DateTime.Now.Add(duration));
cache.AppendCacheExtension("must-revalidate, proxy-revalidate");
cache.SetMaxAge(duration);
}
private void SetCache(HttpCachePolicy cache, DateTime lastModified)
{
// Use ASP.Net output cache.
cache.SetExpires(DateTime.UtcNow.Add(_imageProviderPath.Expiration));
cache.SetValidUntilExpires(true);
cache.SetRevalidation(HttpCacheRevalidation.AllCaches);
cache.SetCacheability(HttpCacheability.Public);
cache.SetMaxAge(_imageProviderPath.Expiration);
cache.SetLastModified(lastModified.ToUniversalTime());
cache.SetETagFromFileDependencies();
}
private void ProcessMediaObject()
{
// Send the specified file to the client.
try
{
IMimeType mimeType = MimeType.LoadInstanceByFilePath(this._filename);
this._context.Response.Clear();
this._context.Response.ContentType = mimeType.FullType;
this._context.Response.Buffer = false;
HttpCachePolicy cachePolicy = this._context.Response.Cache;
cachePolicy.SetExpires(DateTime.Now.AddSeconds(2592000)); // 30 days
cachePolicy.SetCacheability(HttpCacheability.Public);
cachePolicy.SetValidUntilExpires(true);
FileStream fileStream = null;
try
{
int bufferSize = Config.GetCore().MediaObjectDownloadBufferSize;
byte[] buffer = new byte[bufferSize];
fileStream = File.OpenRead(this._filepath);
// Required for Silverlight to properly work
this._context.Response.AddHeader("Content-Length", fileStream.Length.ToString());
int byteCount;
while ((byteCount = fileStream.Read(buffer, 0, buffer.Length)) > 0)
{
if (this._context.Response.IsClientConnected)
{
this._context.Response.OutputStream.Write(buffer, 0, byteCount);
this._context.Response.Flush();
}
else
{
return;
}
}
}
finally
{
if (fileStream != null)
{
fileStream.Close();
}
}
}
catch (Exception ex)
{
AppErrorController.LogError(ex);
}
}
public static void Cache(TimeSpan duration)
{
HttpCachePolicy cache = HttpContext.Current.Response.Cache;
FieldInfo maxAgeField = cache.GetType().GetField("_maxAge", BindingFlags.Instance | BindingFlags.NonPublic);
maxAgeField.SetValue(cache, duration);
cache.SetCacheability(HttpCacheability.Public);
cache.SetExpires(DateTime.Now.Add(duration));
cache.SetMaxAge(duration);
cache.AppendCacheExtension("must-revalidate, proxy-revalidate");
}
protected override void OnStartProcessingRequest(ProcessRequestArgs args)
{
//Cache for a minute based on querystring
HttpContext context = HttpContext.Current;
HttpCachePolicy c = HttpContext.Current.Response.Cache;
c.SetCacheability(HttpCacheability.ServerAndPrivate);
c.SetExpires(HttpContext.Current.Timestamp.AddSeconds(60));
c.VaryByHeaders["Accept"] = true;
c.VaryByHeaders["Accept-Charset"] = true;
c.VaryByHeaders["Accept-Encoding"] = true;
c.VaryByParams["*"] = true;
}
private void SetResponseCache(HttpContext context)
{
HttpCachePolicy cache = context.Response.Cache;
cache.SetLastModified(new DateTime(ResourceManager.GetAssemblyTime(typeof(ResourceManager).Assembly)));
cache.SetOmitVaryStar(true);
cache.SetVaryByCustom("v");
cache.SetExpires(DateTime.UtcNow.AddYears(1));
cache.SetMaxAge(TimeSpan.FromDays(365));
cache.SetValidUntilExpires(true);
cache.SetRevalidation(HttpCacheRevalidation.AllCaches);
cache.SetCacheability(HttpCacheability.Public);
}
public void ProcessRequest(HttpContext context)
{
HttpRequest request = context.Request;
string physicalPath = request.PhysicalPath;
if (File.Exists(physicalPath))
{
string subfix = Path.GetExtension(physicalPath);
bool isOutputCache = false;
HttpResponse response = context.Response;
if (".png".Equals(subfix, StringComparison.CurrentCultureIgnoreCase))
{
isOutputCache = true;
response.ContentType = "image/x-png";
}
else if (".jpg".Equals(subfix, StringComparison.CurrentCultureIgnoreCase))
{
isOutputCache = true;
response.ContentType = "image/pjpeg";
}
if (isOutputCache)
{
const int DAYS = 30;
string ifModifiedSince = request.Headers["If-Modified-Since"];
if (!string.IsNullOrEmpty(ifModifiedSince) &&
TimeSpan.FromTicks(DateTime.Now.Ticks - DateTime.Parse(ifModifiedSince).Ticks).Days < DAYS)
{
response.StatusCode = (int)System.Net.HttpStatusCode.NotModified;
response.StatusDescription = "Not Modified";
response.End();
return;
}
else
{
HttpCachePolicy cache = response.Cache;
cache.SetLastModifiedFromFileDependencies();
cache.SetETagFromFileDependencies();
cache.SetCacheability(HttpCacheability.Public);
cache.SetExpires(DateTime.Now.AddDays(DAYS));
TimeSpan timeSpan = TimeSpan.FromDays(DAYS);
cache.SetMaxAge(timeSpan);
cache.SetProxyMaxAge(timeSpan);
cache.SetLastModified(context.Timestamp);
cache.SetValidUntilExpires(true);
cache.SetSlidingExpiration(true);
}
}
response.WriteFile(physicalPath);
response.End();
}
}
/// <summary>
/// 缓存
/// </summary>
/// <param name="instance">HttpContext扩展</param>
/// <param name="duration">时间差</param>
public static void Cache(this HttpContext instance, TimeSpan duration)
{
instance.CheckOnNull("instance");
HttpCachePolicy cache = instance.Response.Cache;
cache.SetCacheability(HttpCacheability.Public);
cache.SetOmitVaryStar(true);
cache.SetExpires(instance.Timestamp.Add(duration));
cache.SetMaxAge(duration);
cache.SetValidUntilExpires(true);
cache.SetLastModified(instance.Timestamp);
cache.SetLastModifiedFromFileDependencies();
cache.SetRevalidation(HttpCacheRevalidation.AllCaches);
}
private void SetResponseCache(HttpContext context)
{
HttpCachePolicy cache = context.Response.Cache;
cache.SetLastModified(DateTime.Now.ToUniversalTime().AddSeconds(-1.0));
cache.SetOmitVaryStar(true);
cache.SetVaryByCustom("v");
cache.SetExpires(DateTime.UtcNow.AddDays(365.0));
cache.SetMaxAge(TimeSpan.FromDays(365.0));
cache.SetValidUntilExpires(true);
cache.SetRevalidation(HttpCacheRevalidation.AllCaches);
cache.SetCacheability(HttpCacheability.Public);
cache.SetLastModifiedFromFileDependencies();
}
internal static void SetCacheLastModified(HttpContext context, DateTime lastModifiedTime, bool neverExpires)
{
if (lastModifiedTime.ToUniversalTime() < DateTime.UtcNow)
{
HttpCachePolicy cache = context.Response.Cache;
cache.SetCacheability(HttpCacheability.Public);
cache.SetLastModified(lastModifiedTime);
if (neverExpires)
{
cache.SetExpires(DateTime.Now.AddYears(1));
cache.SetValidUntilExpires(true);
}
}
}
/// <summary>
/// Sets a response to be cached for a given amount of time following the initial request, allowing both shared and private caches
/// </summary>
/// <param name="cachePolicy">The response.</param>
/// <param name="currentTime">The current time.</param>
/// <param name="cacheExpiryTime">The cache expiry time.</param>
/// <param name="responseIsIdenticalForEveryUser">if set to <c>true</c> one user may receive a response that was prepared for another user.</param>
/// <exception cref="System.ArgumentNullException">cachePolicy</exception>
/// <remarks>This method is for use with ASP.NET WebForms</remarks>
public void CacheUntil(HttpCachePolicy cachePolicy, DateTime currentTime, DateTime cacheExpiryTime, bool responseIsIdenticalForEveryUser = true)
{
if (cachePolicy == null)
{
throw new ArgumentNullException("cachePolicy");
}
// Max-Age is the current standard, and Expires is the older one
cachePolicy.SetMaxAge(cacheExpiryTime.Subtract(currentTime));
cachePolicy.SetExpires(cacheExpiryTime);
// Public allows caching on shared proxies as well as users' own browsers
cachePolicy.SetCacheability(responseIsIdenticalForEveryUser ? HttpCacheability.Public : HttpCacheability.Private);
}
protected override void OnStartProcessingRequest(ProcessRequestArgs args)
{
base.OnStartProcessingRequest(args);
HttpContext context = HttpContext.Current;
if (null != context)
{
HttpCachePolicy c = context.Response.Cache;
c.SetCacheability(HttpCacheability.ServerAndPrivate);
c.SetExpires(context.Timestamp.AddSeconds(30));
c.VaryByHeaders["Accept"] = true;
c.VaryByHeaders["Accept-Charset"] = true;
c.VaryByHeaders["Accept-Encoding"] = true;
c.VaryByParams["*"] = true;
}
}
/// <summary>
/// When overridden in a derived class, returns a read-only stream to the virtual resource.
/// </summary>
/// <returns>
/// A read-only stream to the virtual file.
/// </returns>
public override Stream Open()
{
// Set the response headers here. It's a bit hacky.
HttpCachePolicy cache = HttpContext.Current.Response.Cache;
cache.SetCacheability(HttpCacheability.Public);
cache.VaryByHeaders["Accept-Encoding"] = true;
IFileSystem azureBlobFileSystem = FileSystemProviderManager.Current.GetUnderlyingFileSystemProvider("media");
int maxDays = ((AzureBlobFileSystem)azureBlobFileSystem).FileSystem.MaxDays;
cache.SetExpires(DateTime.Now.ToUniversalTime().AddDays(maxDays));
cache.SetMaxAge(new TimeSpan(maxDays, 0, 0, 0));
cache.SetRevalidation(HttpCacheRevalidation.AllCaches);
return(this.stream());
}
protected override void OnStartProcessingRequest(ProcessRequestArgs args)
{
base.OnStartProcessingRequest(args);
HttpCachePolicy c = HttpContext.Current.Response.Cache;
c.SetCacheability(HttpCacheability.ServerAndPrivate);
c.SetExpires(HttpContext.Current.Timestamp.AddSeconds(600));
c.VaryByHeaders["Accept"] = true;
c.VaryByHeaders["Accept-Charset"] = true;
c.VaryByHeaders["Accept-Encoding"] = true;
c.VaryByParams["*"] = true;
// don't allow clients to mess with this. its valid period
c.SetValidUntilExpires(true);
}
private static void SetCache(bool suppressLastModified = false)
{
HttpContext.Current.Response.AddHeader("Age", ((int)(PortalContext.Current.LastModified - DateTime.Now).TotalSeconds).ToString(CultureInfo.InvariantCulture));
HttpCachePolicy cache = HttpContext.Current.Response.Cache;
TimeSpan expires = TimeSpan.FromDays(14);
cache.SetExpires(DateTime.UtcNow.Add(expires));
cache.SetMaxAge(expires);
DateTime dt = PortalContext.Current.LastModified;
string eTagDate = "\"" + dt.ToString("s", DateTimeFormatInfo.InvariantInfo) + "\"";
HttpContext.Current.Response.AddHeader("ETag", eTagDate);
if (!suppressLastModified)
{
cache.SetLastModified(PortalContext.Current.LastModified);
}
}
