Function createSetHeader

index.js:71–98

* Create function to set response time header. * @private

(options)

 */

function createSetHeader (options) {
  // response time digits
  var digits = options.digits !== undefined
    ? options.digits
    : 3

  // header name
  var header = options.header || 'X-Response-Time'

  // display suffix
  var suffix = options.suffix !== undefined
    ? Boolean(options.suffix)
    : true

  return function setResponseHeader (req, res, time) {
    if (res.getHeader(header)) {
      return
    }

    var val = time.toFixed(digits)

    if (suffix) {
      val += 'ms'
    }

    res.setHeader(header, val)
  }
}