I think that's for the Page Previews feature
(i.e., when a user hovers
over a link on desktop Wikipedia) or
its corresponding feature in the the Wikipedia for
Android (triggered by
default on link tap)
The code that Fran pointed to only discounts "previews" by Android app as
we stablished that convention a while back. Page previews (hovers over
wikipedia links that display a short popup) are not counted as pageviews at
all at this time.
By "prefetching", I meant X's Wikipedia
page shows up in the search
results and the browser prefetches/preloads the search
results but I do not
click on X's Wikipedia page. If so, the >pageview data seem to over-count
the number of visits to X's Wikipedia page.
This functionality needs to be implemented by the client (it is not
automagically implemented by the browser) and it is not implemented on
Wikipedia. Searches trigger requests to the API, that return pageview urls,
not pageview prefetches. You can follow these workflows on the dev tools of
the browser you might be using. chrome://net-export/ is a new addition to
the toolset that gives you a readable dump.
Are you saying that browser-based prefetch activity
(e.g., with resource
hinting like
https://www.w3.org/TR/resource-hints/ ) is also
tagged the
same way?
No. Browser prefetches cannot be tagged, they are initiated by the browser.
Wikipedia's pages do not do any prefetches and or pre-renderings of content
using those directives as far as I can see. dns-prefetches are done for two
domains: login and meta, neither of which counts as a pageview cause a dns
prefetch does not receive an http response. Just instantiates a connection
and resolves TLS if any. Prefetches might be indicated by a standard set of
headers like "Link:" in the future (this would be initiated by the browser)
but that seems on the works.
Thanks,
Nuria
On Wed, Dec 19, 2018 at 9:43 AM Adam Baso <abaso(a)wikimedia.org> wrote:
Fran, the preview to which you refer, I think
that's for the Page Previews
feature (i.e., when a user hovers over a link on desktop Wikipedia) or its
corresponding feature in the the Wikipedia for Android (triggered by
default on link tap) and Wikipedia for iOS (force press) apps, is that
right? Are you saying that browser-based prefetch activity (e.g., with
resource hinting like
https://www.w3.org/TR/resource-hints/ ) is also
tagged the same way?
Chenqi Zhu, I think what you're suggesting is the possibility that
browsers might be issuing HTTP prefetches for Wikimedia-hosted pages and
that could inflate pageviews. I'm not sure, but have you happened to
observe user agents making prefetches when resource hinting (
https://www.w3.org/TR/resource-hints/ ) is absent? I'm not sure how
often, if at all, discovery platforms like search engines are actually
placing resource hints into markup (which is mostly deterministic as far as
browser behavior) for Wikimedia content...nor to what degree there might be
heuristics being used for prefetching independently of any resource hints.
Do you have any data or field observations to help clarify?
Browser settings allude to this sort of behavior (e.g., in Chrome, there's
"Use a prediction service to load pages more quickly", which is described
at
https://support.google.com/chrome/answer/114836 ), although I think
without digging into browser source code it's a bit hard to know for
certain what's going on "under the hood". We do use preconnect and
prefetch
semantics and the like in different contexts (cf.
https://phabricator.wikimedia.org/search/query/G2tr8i0YZii9 ,
https://phabricator.wikimedia.org/search/query/.dtx_hqaj3wj , ...there
may be more).
-Adam
On Wed, Dec 19, 2018 at 11:00 AM Francisco Dans <fdans(a)wikimedia.org>
wrote:
Hi Chenqi,
You can find out more about what constitutes a pageview in its Metawiki
article:
https://meta.wikimedia.org/wiki/Research:Page_view#Definition
As you can see, one of the conditions is whether the request being
examined is a preview or not, in which case it is not counted as a page
view. Hope this helps!
Fran
On Wed, Dec 19, 2018 at 5:30 PM Chenqi Zhu <czhu(a)stern.nyu.edu> wrote:
Hi everyone,
I am trying to better understand the pageview data. I have a quick
question. I apologize if the question has been asked or it is so naive.
If the web browser prefetches a Wikipedia page, does it count as one
pageview in the pageview data? By "prefetching", I meant X's Wikipedia
page
shows up in the search results and the browser prefetches/preloads the
search results but I do not click on X's Wikipedia page. If so, the
pageview data seem to over-count the number of visits to X's Wikipedia page.
Thanks in advance for any insight.
Chenqi Zhu
New York University
44 W 4th St., Suite 10-185(B),
New York, NY 10012, U.S.A.
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