Hi,

On Wed, Nov 27, 2019 at 09:14:09AM +0800, lx wrote:
> Hi:
> When we use module of slice, the nuber of bytes from upstream server
> is more than the bytes which sent to client, So I want to get the number
> of bytes from upstream server, How to get it?

We don't have a variable that returns the sum of all upstream response sizes
from all subrequests.

Also, there can be multiple upstream servers. And each slice can be fetched
from a different one.

> Thank you
>
> Roman Arutyunyan <arut@nginx.com> 于2019年11月26日周二 下午9:10写道：
>
> > Hi,
> >
> > On Tue, Nov 26, 2019 at 07:24:00PM +0800, lx wrote:
> > > hi all:
> > > When I use module of slice, upstream_response_length and
> > > upstream_addr can't work.
> > > nginx.conf :
> > > #########################################################################
> > > include mime.types;
> > > default_type application/octet-stream;
> > >
> > > log_format main
> > >
> > '$status^$scheme^$request^$body_bytes_sent^$request_time^$upstream_cache_status^$remote_addr^$http_referer^$http_user_agent^$content_type^$http_range^$cookie_name^$upstream_addr^$upstream_response_time^$upstream_bytes_received^$upstream_response_length^[$time_local]';
> > >
> > >
> > > access_log logs/access.log main;
> > > rewrite_log on;
> > >
> > > sendfile on;
> > > aio threads;
> > >
> > > keepalive_timeout 65;
> > >
> > > if ($uri ~ ^/([a-zA-Z0-9\.]+)/([a-zA-Z0-9\.]+)/(.*)) {
> > > set $cdn $1;
> > > set $new_host $2;
> > > set $new_uri $3;
> > > }
> > >
> > > location / {
> > > slice 1m;
> > > proxy_cache_lock on;
> > > proxy_cache my_cache;
> > > proxy_cache_key $uri$is_args$args$slice_range;
> > > proxy_set_header Range $slice_range;
> > > proxy_cache_valid 200 206 24h;
> > > proxy_pass http://$cdn/$new_uri;
> > > }
> > > #########################################################################
> > > I Initiate a rang htttp request, for example
> > > #########################################################################
> > > curl -o result -H 'Range: bytes=2001-4932000' "
> > >
> > http://127.0.0.1:64002/A.com/B.com/appstore/developer/soft/20191008/201910081449521157660.patch
> > > "
> > > #########################################################################
> > > upstream_response_length and upstream_bytes_received is just 1 MB, not
> > > 4.9MB. I find nginx build 5 http request to A.com by tcpdump, and nginx
> > > implement slice by subrequest.
> > >
> > > This is why? How to fix it?
> >
> > Yes. When using the slice module, response is served by multiple
> > subrequests.
> > Each subrequest serves its own part. It has a separate cache key, fetches
> > a
> > separate cache entry and contacts the upstream server using a serparate
> > connection. When you use an $upstream_XXX variable, it returns data from
> > a subrequest.
> >
> > If you want combined numbers, use client-side variables like $bytes_sent
> > instead.
> >
> > >
> > > Thank you
> >
> > > _______________________________________________
> > > nginx mailing list
> > > nginx@nginx.org
> > > http://mailman.nginx.org/mailman/listinfo/nginx
> >
> >
> > --
> > Roman Arutyunyan
> > _______________________________________________
> > nginx mailing list
> > nginx@nginx.org
> > http://mailman.nginx.org/mailman/listinfo/nginx
> >

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--
Roman Arutyunyan
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