async POST with Best HTTP/2

uploading-test.cs

/// <summary>
/// UploadTest function
/// </summary>
private async Task<bool> UploadTest(List<string> imagePaths, string json)
{
    // Set UseAlternateSSLDefaultValue to true for TLS1.2
    HTTPManager.UseAlternateSSLDefaultValue = true;
    
    // Set long time for timeout
    HTTPManager.RequestTimeout = TimeSpan.FromMinutes(10);
    
    var request = new HTTPRequest(new Uri("https://example.com/api"), HTTPMethods.Post);    
    
    // Set callback to capture its progress
    request.OnUploadProgress = OnUploadProgress;

    var form = new MultipartFormDataStream(request);

    // Add json string to the form as MemoryStream
    form.AddStreamField(new MemoryStream(Encoding.UTF8.GetBytes(json)), "params", "@params.json", "application/json");

    // Add png images to the form as FileStream
    for (var i = 0; i < imagePaths.Count; i++)
    {
        form.AddStreamField(new FileStream(imagePaths[i], FileMode.Open, FileAccess.Read), "attachments", $"@{i}.png", "image/png");
    }

    var response = await request.GetHTTPResponseAsync().ConfigureAwait(false);

    switch (request.State)
    {
        case HTTPRequestStates.Finished:
            Debug.Log("Upload finished");

            Debug.Log($"response status: {response.StatusCode}");
            Debug.Log($"response data: {response.DataAsText}");

            return response.IsSuccess;
        case HTTPRequestStates.Error:
            Debug.LogError($"Error: {request.Exception?.Message}");
            return false;
        case HTTPRequestStates.Aborted:
            Debug.Log("Request aborted");
            return false;
        case HTTPRequestStates.TimedOut:
            Debug.Log("Request timed out");
            return false;
        case HTTPRequestStates.ConnectionTimedOut:
            Debug.Log("Connection timed out");
            return false;
        default:
            return false;
    }
}

/// <summary>
/// Callback for capturing progress
/// </summary>
private void OnUploadProgress(HTTPRequest request, long uploaded, long length)
{
    if (length == 0) return;

    Debug.Log($"Progress: {(float)uploaded / (float)length}");
}

/// <summary>
/// Using the function
/// </summary>
public async void DoUpload()
{
    var json = "{}";
    
    // List contains local image paths
    var imagePaths = new List<string>();
    
    var result = await UploadTest(imagePaths, json);

    Debug.log($"Upload completed with result {result}");
}