public async Task PostToServer()
{
var entity = await _entityStore.GetEntity(Data.ObjectId, false);
var owner = await _entityStore.GetEntity((string)entity.Data["actor"].First().Primitive, false);
var unflattened = await _entityFlattener.Unflatten(_entityStore, entity);
var token = await _deliveryService.BuildFederatedJWS(owner, Data.TargetInbox);
var hc = new HttpClient();
var serialized = unflattened.Serialize(true).ToString(Formatting.None);
var content = new StringContent(serialized, Encoding.UTF8);
content.Headers.ContentType = new MediaTypeHeaderValue("application/ld+json");
content.Headers.ContentType.Parameters.Add(new NameValueHeaderValue("profile", "\"https://www.w3.org/ns/activitystreams\""));
var message = new HttpRequestMessage(HttpMethod.Post, Data.TargetInbox);
message.Content = content;
message.Headers.Date = DateTimeOffset.Now;
message.Headers.TryAddWithoutValidation("Accept", "application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\"");
message.Headers.Authorization = new AuthenticationHeaderValue("Bearer", token);
message.Headers.Add("Signature", await _buildSignature(owner.Id, message));
var result = await hc.SendAsync(message);
var resultContent = await result.Content.ReadAsStringAsync();
if (!result.IsSuccessStatusCode && (int)result.StatusCode / 100 == 5)
{
throw new Exception("Failed to deliver. Retrying later.");
}
}