/// <summary>
/// 计算响应头ContentType对应的内容
/// </summary>
/// <param name="extname"></param>
/// <returns></returns>
private StaticFileOption GetStaticFileOption(string extname)
{
StaticFileOption option = (StaticFileOption)s_mineTable[extname];
if (option == null)
{
option = new StaticFileOption();
option.Cache = 3600 * 24 * 365; // 默认缓存1年
option.Mine = GetMimeType(extname);
s_mineTable[extname] = option;
}
return(option);
}
/// <summary>
/// 设置响应头
/// </summary>
private void SetHeaders()
{
StaticFileOption option = GetStaticFileOption(_fileinfo.Extension);
if (option.Cache > 0)
{
// 设置缓存响应头
_context.Response.AppendHeader("Cache-Control", "public, max-age=" + option.Cache);
_context.Response.AppendHeader("X-StaticFileHandler", option.Cache.ToString());
_context.Response.AppendHeader("ETag", _fileinfo.LastWriteTime.Ticks.ToString());
}
else
{
//参考链接：https://www.coderxing.com/http-cache-control.html
_context.Response.AppendHeader("Cache-Control", "no-store, max-age=0");
}
// 设置响应内容标头
_context.Response.ContentType = option.Mine;
}