// When there is only a single range the bytes are sent directly in the body.
internal Task SendRangeAsync()
{
bool rangeNotSatisfiable = false;
if (_ranges.Count == 0)
{
rangeNotSatisfiable = true;
}
if (rangeNotSatisfiable)
{
// 14.16 Content-Range - A server sending a response with status code 416 (Requested range not satisfiable)
// SHOULD include a Content-Range field with a byte-range-resp-spec of "*". The instance-length specifies
// the current length of the selected resource. e.g. */length
_response.Headers[Constants.ContentRange] = "bytes */" + _length.ToString(CultureInfo.InvariantCulture);
ApplyResponseHeaders(Constants.Status416RangeNotSatisfiable);
return(Constants.CompletedTask);
}
// Multi-range is not supported.
Debug.Assert(_ranges.Count == 1);
long start, length;
_response.Headers[Constants.ContentRange] = ComputeContentRange(_ranges[0], out start, out length);
_response.ContentLength = length;
ApplyResponseHeaders(Constants.Status206PartialContent);
string physicalPath = _fileInfo.PhysicalPath;
SendFileFunc sendFile = _response.Get <SendFileFunc>(Constants.SendFileAsyncKey);
if (sendFile != null && !string.IsNullOrEmpty(physicalPath))
{
return(sendFile(physicalPath, start, length, _request.CallCancelled));
}
Stream readStream = _fileInfo.CreateReadStream();
readStream.Seek(start, SeekOrigin.Begin); // TODO: What if !CanSeek?
var copyOperation = new StreamCopyOperation(readStream, _response.Body, length, _request.CallCancelled);
Task task = copyOperation.Start();
task.ContinueWith(resultTask => readStream.Close(), TaskContinuationOptions.ExecuteSynchronously);
return(task);
}
public async Task SendAsync()
{
ApplyResponseHeaders(Constants.Status200Ok);
string physicalPath = _fileInfo.PhysicalPath;
SendFileFunc sendFile = _response.Get <SendFileFunc>(Constants.SendFileAsyncKey);
if (sendFile != null && !string.IsNullOrEmpty(physicalPath))
{
await sendFile(physicalPath, 0, _length, _request.CallCancelled);
}
Stream readStream = _fileInfo.CreateReadStream();
var copyOperation = new StreamCopyOperation(readStream, _response.Body, _length, _request.CallCancelled);
await copyOperation.Start();
readStream.Close();
}