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DateTime dt;
if (DateTime.TryParse(request.Headers["If-Modified-Since"], out dt))
{
if ((DateTime.Now - dt).Hours < 60)
{
response.StatusCode = 304;
response.End();
return;
}
}
制作LastModified代码如下:
response.ClearContent();
response.ContentType = request.ContentType;
response.Cache.SetCacheability(HttpCacheability.Public);
response.Cache.SetLastModified(DateTime.Now);
response.Expires = 60;