Audit: Avoid landing page redirects

[paulirish]

example psi report

We need the request URLs in the redirect chain of the primary HTML resource

Fail if there was a redirect. Calculate the time wasted.

(Also for PSI parity)

[wardpeet]

Could you give some more info about

static get meta() {
    return {
      category: 'Performance',
      name: 'redirects-landingpage',
      description: 'Avoid landing page redirects',
      failureDescription: 'We\'ve found landing page redirects.',
      helpText: '[Learn more](https://developers.google.com/speed/docs/insights/AvoidRedirects).',
@    };
  }

[paulirish]

static get meta() {
    return {
      category: 'Performance',
      name: 'redirects',
      description: 'Avoids page redirects.',
      failureDescription: 'Has page redirects.',
      helpText: ' Redirects introduce additional delays before the page can be loaded. [Learn more](https://developers.google.com/speed/docs/insights/AvoidRedirects).',
@    };
  }

[brendankenny]

This ancient bug also had some ideas: #605 :)