proxy_ignore_client_abort with cache

[Maxim Dounin]

Hello!

On Wed, Jun 19, 2019 at 10:39:45AM -0700, Roger Fischer wrote:

> I am using NGINX (1.17.0) as a reverse proxy with cache. I want 
> the cache to be updated even when the client closes the 
> connection before the response is delivered to the client. 
> 
> Will setting proxy_ignore_client_abort to on do this?

When caching is enabled, nginx will ignore connection close by the 
client regardless of the proxy_ignore_client_abort value, much 
like with "proxy_ignore_client_abort on".  Additionally, it will 
ignore errors when sending the response to the client.

[...]

> The discussion referenced below implies that the upstream 
> connection is still closed when nginx fails to send the response 
> to the client.

Yes, with "proxy_ignore_client_abort on;" (and assuming
proxy_store/proxy_cache is not enabled).

> In the case of a range request, nginx will send the response 
> once the requested range is available, and thus before the 
> resource is completely downloaded.
> Therefore, this would imply that the resource will not be 
> cached, regardless of the value of the proxy_ignore_client_abort 
> directive.
> https://forum.nginx.org/read.php?2,253026,253029#msg-253029

You seems to assume that sending the range once it is available 
implies that nginx will fail to send the response.  This is not 
true - the range filter simply skips unneeded data, and does not 
generate any errors.  Either way, this is completely unrelated to 
caching - which explicitly ignores any errors even if they happen.

-- 
Maxim Dounin
http://mdounin.ru/