A DESCRIPTION OF THE PROBLEM :
On this line:

https://github.com/openjdk/jdk/blob/master/src/java.net.http/share/classes/jdk/internal/net/http/ResponseSubscribers.java#L483

HttpResponseInputStream catches InterruptedException and ignores it. This makes it impossible (?) to interrupt or a cancel a thread that is downloading a file by copying the inputstream to disk. There's no explanation in the code of why the code swallows exceptions in this way.