http - How to combine "via" header from a upstream using nginx -


for example, used 

set $myvia "newserver"; if ($upstream_http_via) {     set $myvia "$upstream_http_via,newserver"; } add_header via $myvia;

but in nginx not work, response via:newserver client. if use $upstream_http_via straight away, works, can not check if upstream have via header or not. can me, lot.


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