Turbo 8 Prefetch (InstantClick)

Inspired by instaclick.io, instaclick has been added as a default behaviour in Turbo 8.

InstantClick makes an assumption about potential user behaviour: now whenever you hover on a link, it will fire a GET request to retrieve that page. So when you actually click on the link, it will load faster.

InstantClick/prefetch example:

Such a request will also have a header X-Sec-Purpose: prefetch

Here are a few tips based on the docs

These links will never be prefetched:

# current page
link_to "Comments", request.path
# anchor tags (obviously on current page)
link_to "Comments", "#comments"
# non-GET requests
link_to "Upvote", upvote_post_path(@post), data: {turbo_method: :post}
# other websites
link_to "Other website", "https://superails.com"

Disable prefetch:

link_to "Admin", admin_path, data: {turbo_prefetch: false}
link_to "Admin", admin_path, data: {turbo: false}

# disable for a block
<div data-turbo="false">
  link_to "Admin", admin_path
</div>

# disable globally in application.html.erb
<meta name="turbo-prefetch" content="true" />

Caution:

• wrong assumptions can lead to more server load
• you would not want to count these prefetch requests as page visits
• whenever you re-hover on a link, it will trigger yet another request