Opens the remote PDF file at uri through HTTP range requests.
public static Task<PdfDocument> OpenAsync(HttpClient httpClient, Uri uri, PdfOptions options)
The client the requests go through; not disposed. It stays in use until the document is disposed.
The file's address.
The options, such as the range block size, cache limit and whether synchronous reads may fetch.
Spec #33, viewer capability 5. As OpenAsync(HttpClient, Uri, PdfOptions, CancellationToken), without cancellation.