/// <summary>
/// Checks if the client has the current version cached.
/// </summary>
/// <param name="context">The HTTP Context</param>
/// <param name="serverInfo">The service info</param>
/// <returns>If the client has the same version cached</returns>
public static bool IsCached(HttpContext context, HttpCacheInfo serverInfo)
{
var clientInfo = Get(context);
if (clientInfo.EntityTag == serverInfo.EntityTag)
{
return(true);
}
if (clientInfo.LastModified.HasValue)
{
return(clientInfo.LastModified.Value >= serverInfo.LastModified.Value);
}
return(false);
}
public static HttpCacheInfo Get(HttpContext context)
{
var info = new HttpCacheInfo();
info.EntityTag = context.Request.Headers["If-None-Match"];
string lastMod = context.Request.Headers["If-Modified-Since"];
if (!string.IsNullOrWhiteSpace(lastMod))
{
try {
info.LastModified = DateTime.Parse(lastMod);
} catch {}
}
return(info);
}