public override IObservable <UnityWebRequest> FetchHead(IProgress <float> progress = null)
{
return(Observable.Defer(() =>
{
if (IsHeadFetched)
{
return ReturnNull.ReportOnCompleted(progress);
}
return UnityWebRequest.Head(Url).SendAsObservable(progress /*, ETag, LastModified*/).Do(request =>
{
OnHeadFetched(request);
if (!IsDownloaded && request.GetETag() == ETag)
{
OnDownloaded(request);
}
});
}));
}
//public string ETag { get; set; }
//public string LastModified { get; set; }
public override IObservable <UnityWebRequest> FetchHead(IProgress <float> progress = null)
{
return(Observable.Defer(() =>
{
if (IsHeadFetched)
{
return ReturnNull.ReportOnCompleted(progress);
}
return (Hash.isValid ? AssetLoader.WhenCacheReady() : Observable.ReturnUnit()).ContinueWith(_ =>
{
if (Hash.isValid && Caching.IsVersionCached(Url, Hash))
{
try { OnDownloaded(null); } // TODO remove try-catch block https://github.com/neuecc/UniRx/issues/311
catch (Exception ex) { return Observable.Throw <UnityWebRequest>(ex); }
return ReturnNull.ReportOnCompleted(progress);
}
return UnityWebRequest.Head(Url).SendAsObservable(progress /*, ETag, LastModified*/).Do(OnHeadFetched);
});
}));
}
public override IObservable <UnityWebRequest> Download(IProgress <float> progress = null) =>
Observable.Defer(() => IsHeadFetched ? ReturnNull : FetchHead()).ContinueWith(_ =>
IsDownloaded ? ReturnNull.ReportOnCompleted(progress) : DoDownload(progress));
