If content type is multipart/mixed throws exception with the stream #106

@stevcooo

Description

I'm trying to parse multipart/mixed content but it throws exception:
"Unable to determine boundary: either the stream is empty or we reached the end of the stream"

var responseMessage = await httpClient.PostAsync("/batch", multipartContent);
var responseString = await responseMessage.Content.ReadAsStringAsync();
var stream = await responseMessage.Content.ReadAsStreamAsync();
var multipartContentResponse = await MultipartFormDataParser.ParseAsync(stream);

Can you please help me with this one?