entry/response.go
func (r *Response) ContentType() string {
	if r.contentType == "" {
		r.contentType = "text/html; charset=utf-8"
	}
	return r.contentType
}
func (r *Response) ContentType() string {
	if r.contentType == "" {
		r.contentType = "text/html; charset=utf-8"
	}
	return r.contentType
}
// ContentType returns a valid content type