code: func (ctx *Context) ServeContent(name string, r io.ReadSeeker, params ...interface{}) {
  	modtime := time.Now()
  	for _, p := range params {
  		switch v := p.(type) {
  		case time.Time:
  			modtime = v
  		}
  	}
  
  	ctx.setRawContentHeader()
  	http.ServeContent(ctx.Resp, ctx.Req.Request, name, modtime, r)
  }
docs: // ServeContent serves given content to response.