# File lib/parts.rb, line 47
    def build_head(boundary, name, filename, type, content_len)
      part = ''
      part << "--#{boundary}\r\n"
      part << "Content-Disposition: form-data; name=\"#{name.to_s}\"; filename=\"#{filename}\"\r\n"
      part << "Content-Length: #{content_len}\r\n"
      part << "Content-Type: #{type}\r\n"
      part << "Content-Transfer-Encoding: binary\r\n"
      part << "\r\n"
    end