public static void ApplyCacheRequestDirective(this HttpRequestMessage requestMessage, CacheRequestDirective cacheDirective, ConditionalRequestDirective conditionalDirective)
{
var cacheControlHeader = new CacheControlHeaderValue();
cacheControlHeader.MaxAge = cacheDirective.MaxAge;
cacheControlHeader.MaxStale = cacheDirective.MaxStale.HasValue;
if (cacheDirective.MaxStale != TimeSpan.MaxValue)
cacheControlHeader.MaxStaleLimit = cacheDirective.MaxStale;
cacheControlHeader.MinFresh = cacheDirective.MinFresh;
cacheControlHeader.NoCache = cacheDirective.NoCache;
if (cacheDirective.NoCache)
requestMessage.Headers.Pragma.Add(new NameValueHeaderValue("no-cache"));
cacheControlHeader.NoStore = cacheDirective.NoStore;
// TODO deal with no-transform
cacheControlHeader.OnlyIfCached = cacheDirective.OnlyIfCached;
requestMessage.Headers.CacheControl = cacheControlHeader;
requestMessage.Headers.IfModifiedSince = conditionalDirective.IfModifiedSince;
requestMessage.Headers.IfUnmodifiedSince = conditionalDirective.IfUnmodifiedSince;
CopyETags(conditionalDirective.IfMatch, requestMessage.Headers.IfMatch);
CopyETags(conditionalDirective.IfNoneMatch, requestMessage.Headers.IfNoneMatch);
}
public static CacheRequestDirective ReadCacheRequestDirective(this HttpRequest request)
{
var result = new CacheRequestDirective();
var typedHeaders = request.GetTypedHeaders();
var CacheControl = typedHeaders.CacheControl;
if (CacheControl != null)
{
result.MaxAge = CacheControl.MaxAge;
result.MaxStale = CacheControl.MaxStale ? (CacheControl.MaxStaleLimit ?? TimeSpan.MaxValue) : (TimeSpan?)null;
result.MinFresh = CacheControl.MinFresh;
result.NoCache = CacheControl.NoCache;
result.NoStore = CacheControl.NoStore;
result.OnlyIfCached = CacheControl.OnlyIfCached;
}
else
{
result.NoCache = request.Headers[HeaderNames.Pragma].ToString() == "no-cache";
}
return result;
}