upstream_response_length and upstream_addr can't work

[Roman Arutyunyan]

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

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-- 
Roman Arutyunyan