internal virtual IAsyncResult BeginSend(BaseWriter writer, bool sendEnvelope, bool allowUnicode,
AsyncCallback callback, object state)
{
PrepareHeaders(sendEnvelope, allowUnicode);
writer.WriteHeaders(Headers, allowUnicode);
if (Content != null)
{
return(Content.BeginSend(writer, callback, allowUnicode, state));
}
else
{
LazyAsyncResult result = new LazyAsyncResult(this, state, callback);
IAsyncResult newResult = writer.BeginGetContentStream(EmptySendCallback, new EmptySendContext(writer, result));
if (newResult.CompletedSynchronously)
{
writer.EndGetContentStream(newResult).Close();
}
return(result);
}
}