See varnish-cache commits
* 2da6c5e539f8f858c446812d30f00de600ecc3e4
* 63807dd22725653e23c20071a9eb958642413f36

Ref varnish-cache master 2d0843eac8d77cfb3369591a61234d9c3ed6881e

Introduced

Ref: varnish-cache 9ad80c88f26d9a90d21b59f265d31be61ae545a0

The VSM API has changed.

Ref: e9c70c7306eb94c14768648dca03fc5b6c3252f9

in particular to find varnishncsa

do that any more. But will have to revisit the formatting, because
Varnish VSL and its tools apparently don't use VSB_quote for binary
data any more.

tag to be read for a specific header, but also the first occurrence of
the tag. For example when both %{Varnish:first_byte}x (which requires
Timestamp:Resp) and %{tag:Timestamp}x (without a header specifier)
appear in the output format.

only calls VSB_quote() for the payload if the payload contains a
non-printable character (for somewhat better compatibility with
varnishncsa).

with varnishncsa