phantomas/modules/redirects/redirects.js

Headless Chromium-based web performance metrics collector and monitoring tool

/**
 * Analyzes HTTP redirects
 */
"use strict";

module.exports = function (phantomas) {
  phantomas.setMetric("redirects"); // @desc number of HTTP redirects (either 301, 302 or 303)
  phantomas.setMetric("redirectsTime"); // @desc time it took to send and receive redirects

  phantomas.on("recv", function (entry, res) {
    if (entry.isRedirect) {
      phantomas.incrMetric("redirects");
      phantomas.incrMetric("redirectsTime", entry.timeToLastByte);

      phantomas.addOffender(
        "redirects",
        entry.url +
          " is a redirect (HTTP " +
          entry.status +
          " " +
          entry.statusText +
          ") " +
          "to " +
          (res.redirectURL || entry.headers.Location) +
          " (took " +
          entry.timeToLastByte +
          " ms)"
      );
    }
  });
};