proxy_ignore_client_abort not working on linux

[badtzhou]

I can't get proxy_ignore_client_abort to work correctly on linux. The
default option is off. But when I proxy a large cacheable file, nginx
doesn't close the backend connection right away when client abort the
request. The backend connection was not closed until the entire file has
been buffered and cached.
Any idea why? Thanks!

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,271255,271255#msg-271255