Wrong Content-Type header generated using MultipartFormDataContent

Question

I have the following code:

private static string boundary = \"----CustomBoundary\" + DateTime.Now.Ticks.ToString(\"x\");

private static async Task

        

Answer 1

Solved this by removing the header from MultipartFormDataContent and re-adding it back without validation:

content.Headers.Remove("Content-Type");
content.Headers.TryAddWithoutValidation("Content-Type", "multipart/form-data; boundary=" + boundary);