[Varnish] #1856: LostHeader setting req.url to an empty string

[Varnish]

#1856: LostHeader setting req.url to an empty string
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 Reporter:  gdelacroix  |       Owner:
     Type:  defect      |      Status:  needinfo
 Priority:  normal      |   Milestone:
Component:  varnishd    |     Version:  trunk
 Severity:  normal      |  Resolution:
 Keywords:              |
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Comment (by fgsch):

 In previous version the request will not fail but further **set req.**
 would be ignored.
 Starting with 4.1 we fail the request altogether.

 I think the issue here is whether we should allow to set variables to an
 empty value via vrt_do_string().
 These variables are special and it doesn't make sense to set e.g. proto to
 "".

 In any case, the workspace exhaustion is incorrect here.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1856#comment:9>
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