code: func (c *Ctx) Inline(r io.Reader, filename string) (err error) {
  
  	c.response.Header().Set(ContentDisposition, "inline;filename="+filename)
  	c.response.Header().Set(ContentType, detectContentType(filename))
  	c.response.WriteHeader(http.StatusOK)
  
  	_, err = io.Copy(c.response, r)
  
  	return
  }
docs: // Inline is a helper method for returning a file inline to
  // be rendered/opened by the browser