The server can't tell if or which articles you accessed in a query.
If the server has removed an article, then it's possible it would send back a broken response to you, but the server would not be able to tell if that happened. There would only be an information leak if you reacted to the broken response.
If you mean observing that you made a query at all, versus not making a query, sure that's observable.
The server can't tell if or which articles you accessed in a query.
If the server has removed an article, then it's possible it would send back a broken response to you, but the server would not be able to tell if that happened. There would only be an information leak if you reacted to the broken response.
If you mean observing that you made a query at all, versus not making a query, sure that's observable.