/// <summary>
/// Like GET, but only returns the header fields and not the body. You
/// can use this call to get the current revision of a document or check if
/// the document was deleted.
/// HEAD/_api/document/{document-handle}
/// </summary>
/// <param name="documentId"></param>
/// <param name="headers">Object containing a dictionary of Header keys and values</param>
/// <exception cref="System.ArgumentException">Document ID is invalid.</exception>
/// <remarks>
/// 200: is returned if the document was found.
/// 304: is returned if the “If-None-Match” header is given and the document has the same version.
/// 404: is returned if the document or collection was not found.
/// 412: is returned if an “If-Match” header is given and the found document has a different version. The response will also contain the found document’s current revision in the Etag header.
/// </remarks>
/// <returns></returns>
public virtual async Task <HeadDocumentResponse> HeadDocumentAsync(
string documentId,
HeadDocumentHeader headers = null)
{
ValidateDocumentId(documentId);
string uri = _docApiPath + "/" + documentId;
WebHeaderCollection headerCollection;
if (headers == null)
{
headerCollection = new WebHeaderCollection();
}
else
{
headerCollection = headers.ToWebHeaderCollection();
}
using (var response = await _client.HeadAsync(uri, headerCollection))
{
return(new HeadDocumentResponse
{
Code = (HttpStatusCode)response.StatusCode,
Etag = response.Headers.ETag
});
}
}