[Varnish] #1771: External VDP filters can't change resp_len on cached objects

[Varnish]

#1771: External VDP filters can't change resp_len on cached objects
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 Reporter:  fgsch     |      Owner:
     Type:  defect    |     Status:  new
 Priority:  normal    |  Milestone:
Component:  varnishd  |    Version:  trunk
 Severity:  normal    |   Keywords:
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 If you push a VDP filter in vcl_deliver{} and it needs to change the
 object's length, changing req->resp_len in either the vmod or the VDP init
 function will be lost in cnt_vdp()
 for cached objects.
 For non-cached objects (bo != NULL) the filter could unset C-L to get away
 but if we are coming from vcl_hit{} there is no way around it.

 As per discussion on irc:

 12:28 < phk> fgs, yes, right now.  That's what I said yesterday:  We need
 to move that C-L thing up before vcl_deliver{}

 To be addressed post release.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1771>
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