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Page Speed: Make landing page redirects cacheable More Recommendations

Rule Summary

Server
High
Easy
100%

Overview

Many pages, especially mobile pages, redirect users to a different URL, for instance from www.example.com to m.example.com. Making this redirect cacheable by the user's browser can speed up page load times for repeat visitors to a site.

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Details from Google

While the best practice with redirects is to remove them wherever possible, it can sometimes be difficult to eliminate landing page redirects, especially redirects to mobile-specific sites. For instance, the mobile version of a site may be served from a different web server, which can require redirecting to a different hostname. In these cases, it's important to make the redirect to the mobile-specific site cacheable, to reduce page load times for repeat visitors. If the mobile version of your web site is served from the same web server as the desktop version of your site, you should instead eliminate mobile-specific redirects and serve from the same URL as your desktop page.

recommends:

Mobile-specific redirects must be privately cacheable, in order to prevent proxies from serving the mobile redirect to non-mobile users. We recommend using a 302 redirect with a cache lifetime of one day. The redirect should include a Vary: User-Agent header as well as a Cache-Control: private header. These headers prevent proxies from serving mobile-specific redirects to non-mobile users. You may also want to include an Expires header in the past, to prevent old HTTP/1.0 proxies from caching these redirects and serving them to non-mobile users.

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