Content-Type header not set on Asp .Net.

[tdhintz]

The ContentType property must be set instead of the header on ASP .Net 4.7.2, like this or similar:

            public void SetHeaderValue(string header, string value)
            {
                if (header.Equals("content-type", System.StringComparison.OrdinalIgnoreCase))
                {
                    _httpResponse.ContentType = value;
                }
                else
                {
                    _httpResponse.Headers.Set(header, value);
                }
            }