public void ContentType_UseAddMethod_AddedValueCanBeRetrievedUsingProperty()
{
_headers.TryAddWithoutValidation("Content-Type", "text/plain; charset=utf-8; custom=value");
MediaTypeHeaderValue value = new MediaTypeHeaderValue("text/plain");
value.CharSet = "utf-8";
value.Parameters.Add(new NameValueHeaderValue("custom", "value"));
Assert.Equal(value, _headers.ContentType);
}