Как отправить вложение в JIRA с помощью REST API?

Как отправить вложение в JIRA с помощью JIRA REST API и HttpWebRequest в C #?

Из документации в /rest/api/2/issue/{issueIdOrKey}/attachments:

POST

Add one or more attachments to an issue.

This resource expects a multipart post. The media-type multipart/form-data is defined in RFC 1867. Most client libraries have classes that make dealing with multipart posts simple. For instance, in Java the Apache HTTP Components library provides a MultiPartEntity that makes it simple to submit a multipart POST.

In order to protect against XSRF attacks, because this method accepts multipart/form-data, it has XSRF protection on it. This means you must submit a header of X-Atlassian-Token: nocheck with the request, otherwise it will be blocked.

The name of the multipart/form-data parameter that contains attachments must be "file"

A simple example to upload a file called "myfile.txt" to issue REST-123:

curl -D- -u admin:admin -X POST -H "X-Atlassian-Token: nocheck" -F "file=@myfile.txt" http://myhost.test/rest/api/2/issue/TEST-123/attachments

у меня есть

foreach (JIRAAttachments attachm in attachments.attachments)
{
    request = HttpWebRequest.Create(
                  logInformation.GetUri() + "/rest/api/2/issue/" + key + "/attachments"
              ) as HttpWebRequest;
    request.Headers.Add("Authorization: Basic " + logInformation.GetEncodeAuthentication());
    request.Method = "POST";
    request.ContentType = "multipart/form-data";
    request.Headers.Add("X-Atlassian-Token: nocheck file=@" + Path.GetFullPath(@"..\Attachments\" + attachm.filename));
    request.KeepAlive = true;
    request.Proxy = wp;
    response = (HttpWebResponse)request.GetResponse();
    Stream s = response.GetResponseStream();
    FileStream fs = new FileStream(Path.GetFullPath(@"..\Attachments\" + attachm.filename), FileMode.Open);
    byte[] write = new byte[256];
    int count = fs.Read(write, 0, write.Length);
    while (count > 0)
    {
        s.Write(write, 0, count);
        count = fs.Read(write, 0, write.Length);
    }
    fs.Close();
    s.Close();
    response.Close();
}

но возвращает ошибку 404...