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我已经创建了一个ashx的文件,以动态生成图像缩略图。我想在第一次调用这些图像后缓存这些图像。缓存ASHX图像响应
网址:
〜/ image.ashx DIR =用户& W = 25 & H = 25 &力= YES & IMG = matt.jpg
代码背后:
public void ProcessRequest (HttpContext context) {
TimeSpan refresh = new TimeSpan(0, 15, 0);
context.Response.Cache.SetExpires(DateTime.Now.Add(refresh));
context.Response.Cache.SetMaxAge(refresh);
context.Response.Cache.SetCacheability(HttpCacheability.Server);
context.Response.CacheControl = HttpCacheability.Public.ToString();
context.Response.Cache.SetValidUntilExpires(true);
string dir = context.Request.QueryString["dir"];
string img = context.Request.QueryString["img"];
bool force = context.Request.QueryString["force"] == "yes";
double w = 0;
double h = 0;
...
context.Response.ContentType = "image/jpeg";
thumb.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
}
使用开发工具在Chrome中我可以看到下面的响应头:
HTTP/1.1 200 OK
Server: ASP.NET Development Server/10.0.0.0
Date: Mon, 26 Sep 2011 19:17:31 GMT
X-AspNet-Version: 4.0.30319
Set-Cookie: .ASPXAUTH=...; path=/; HttpOnly
Cache-Control: no-cache
Pragma: no-cache
Expires: -1
Content-Type: image/jpeg
Content-Length: 902
Connection: Close
有人可以告诉我,为什么这是不完全相同的网址多次调用缓存吗?任何提示将非常感谢。
谢谢主席先生,我相信做到了。 – Greg
如何清除此缓存呢? –
@SubinJacob - 这些是缓存标题。你在说什么? – Oded