Hello.

Switched to Varnish from Nginx for additional functionality and better control 
of handling requests.
But still can't implement what i want. And I want simple behaviour "Redirect on 
MISS/PASS".
I want to use VC for deploying quick "cdn" servers for our mp4-video-servers 
(used for HTML5 players), without need to store all files on this quick (ssd, 
upto 2x480GB space, full database about 6TB).

Currently we have 6 servers with SATA HDDs and hitting iowait like a trucks :) 

Examples:
- Request -> Varnish -> HIT: serve it using Varnish.
- Request -> Varnish -> MISS: start caching data from backend, and instantly 
reply to client: `Location: http://backend/$req.url";
- Request -> Varnish -> UPDATE: see `-> MISS` behaviour.

>From my perspective, i should do this "detach & reply redirect" somewhere in 
>`vcl_miss` OR `vcl_backend_fetch`, because if i understood correctly 
>https://www.varnish-cache.org/docs/4.1/reference/states.html, i need 
>vcl_backend_response to keep run in background (as additional thread) while 
>doing return(synth(...)) to redirect user.

Similiar thing is "hitting stale content while object is updating".
But in my case "replying redirect while object is updating".

Also, i pray to implement this without writing additional scripts, why? I could 
do external php/ruby checker/cache-pusher with nginx & etc. But scared by 
performance downgrade :(
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