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1 forms found in the DOM

GET https://developers.google.com/s/results

<form class="devsite-search-form" action="https://developers.google.com/s/results" method="GET">
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    <button type="button" search-open="" class="devsite-search-button devsite-header-icon-button button-flat material-icons" aria-label="Open search"></button>
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      <div class="devsite-search-image material-icons" aria-hidden="true">
      </div>
    </div>
  </div>
  <div class="devsite-popout" id="devsite-search-popout-container-id-1">
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</form>

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   * Additional requirements for Google Search
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 * On this page
 * Implement SXG
   * Additional requirements for Google Search
 * Monitor and debug SXG
 * Debug the Google SXG cache
 * Stay informed
 * 


GET STARTED WITH SIGNED EXCHANGES ON GOOGLE SEARCH

bookmark_borderbookmark Stay organized with collections Save and categorize
content based on your preferences.

Signed exchanges (SXG) allow Google Search to prefetch your content while
preserving the user’s privacy. In practice, this means that both AMP and non-AMP
results shown on Google Search may prefetch a few key resources (such as HTML,
JavaScript, CSS, images, or fonts) in a privacy-preserving manner, if the
associated website supports SXG.

When the user ultimately clicks the result, the web page starts rendering much
sooner since key resources are already available, leading to a better user
experience. This could mean a lower Largest Contentful Paint (LCP) score for
your content. While Google Search doesn't consider use of SXG as a direct factor
in ranking, the lower LCP may affect ranking because page experience is a
ranking factor.

Note: For more detailed information, visit the Core Web Vitals and Page
experience FAQ.


IMPLEMENT SXG

To implement SXG, follow web.dev's in-depth guide. After implementing, follow
this guide to measuring and optimizing performance improvement with SXG.

For AMP pages, follow amp.dev's in-depth guide.


ADDITIONAL REQUIREMENTS FOR GOOGLE SEARCH

Google uses a cache of SXG to prefetch your content. Google may serve these
cached SXG multiple times.

To make sure that up-to-date content displays in Google Search, set the SXG
expiration values appropriately. As a rule of thumb, make sure that the
expiration date is less than both of these dates:

 * The cache expiration determined by your HTTP headers
 * 1 day in the future if the content is JavaScript or inlines JavaScript;
   otherwise 7 days in the future

To make sure that content displays properly when served on multiple devices, do
the following:

 1. Move personalized content, such as shopping carts, into lazy-loaded elements
    that are outside of the SXG. Alternatively, add the Vary: Cookie signed
    header; SXGs with this header will be shown only to visitors without a
    cookie for your site.
 2. Build the pages with responsive web design. Alternatively, serve desktop and
    mobile pages on separate URLs, or annotate the pages to state that they
    aren't responsive, using the supported-media meta tag. For example, in the
    page's <head> element, add the following tag:
    
    <meta name=supported-media content="only screen and (max-width: 640px)">


MONITOR AND DEBUG SXG

For a list of tools that you can use to debug SXG, check out web.dev's guide to
SXG tools.

In the event that Googlebot can't parse an SXG, it may recrawl the URL without
application/signed-exchange;v=b3 in the Accept header, in order to retrieve the
text/html variant. In the event of any SXG indexing error, Google Search will
link to the original URL, without SXG.

For AMP pages, use the AMP status report in Search Console to monitor SXG
errors.


DEBUG THE GOOGLE SXG CACHE

To determine whether SXG meets the cache requirements, use the SXG Validator
Chrome extension.

Alternatively, query the Google SXG cache directly. For example, if the SXG URL
is https://signed-exchange-testing.dev/sxgs/valid.html, formulate the
corresponding cache URL:

https://signed--exchange--testing-dev.webpkgcache.com/doc/-/s/signed-exchange-testing.dev/sxgs/valid.html

The algorithm for computing the subdomain and the URL path suffix is the same as
for the AMP Cache, while the infix string /doc/-/ is different.

If the response is a SXG, then this means the response from the origin server
meets the Google SXG cache requirements. Otherwise, it will include an HTTP
header that indicates the reason.

 * If there is a Warning header, then it indicates an error that prevented the
   SXG from meeting the cache requirements.
 * If there is a Location header, then it has not yet been fetched by the cache.
   This is not an error in your SXG.

Regardless of the response, the cache enqueues a request to the original URL for
an updated copy. There are several factors for when and if this request happens,
including how fast Googlebot can crawl your site.

Google doesn't cache SXGs for longer than the expires value of the SXG signature
or the freshness lifetime of the unsigned headers of the SXG response.

For AMP pages, you can use the URL Inspection Tool to debug caching errors.


STAY INFORMED

Subscribe to the webpackaging-announce mailing list to stay up-to-date with the
following changes:

 * Changes to the Google SXG cache that enable new capabilities or deprecate
   other capabilities.
 * Major changes to the SXG tools Web Packager, NGINX SXG module, and libsxg.

If you have questions about SXG on Google Search, visit the Search Central Help
Community.

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the Apache 2.0 License. For details, see the Google Developers Site Policies.
Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2024-01-09 UTC.

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