Start reading chat response stream immediately after headers are rece…

…ived (#13)

dotnet/Codeblaze.SemanticKernel.Connectors.Ollama/ChatCompletion/OllamaChatCompletionService.cs

@@ -52,7 +52,9 @@ public async IAsyncEnumerable<StreamingChatMessageContent> GetStreamingChatMessa
  options = chatExecutionSettings
  };
 
- var response = await Http.PostAsJsonAsync($"{Attributes["base_url"]}/api/chat", data, cancellationToken).ConfigureAwait(false);
+ var request = new HttpRequestMessage(HttpMethod.Post, $"{Attributes["base_url"]}/api/chat");
+ request.Content = JsonContent.Create(data);
+ using var response = await Http.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, cancellationToken).ConfigureAwait(false);
 
  ValidateOllamaResponse(response);
 
@@ -64,7 +66,7 @@ public async IAsyncEnumerable<StreamingChatMessageContent> GetStreamingChatMessa
 
  while (!done)
  {
- string jsonResponse = await response.Content.ReadAsStringAsync().ConfigureAwait(false);
+ string jsonResponse = await reader.ReadLineAsync();
 
  var chatResponseMessage = JsonSerializer.Deserialize<OllamaChatResponseMessage>(jsonResponse);
  done = chatResponseMessage!.Done;