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authorEelco Dolstra <eelco.dolstra@logicblox.com>2012-07-11T21·53-0400
committerEelco Dolstra <eelco.dolstra@logicblox.com>2012-07-11T21·53-0400
commitb74d92755d1ca6a1538f292dcb5a906f66af7b51 (patch)
tree4369859a40dc8a13b58e2d507edace3c239078b3 /perl/lib/Nix/Config.pm.in
parent09a6321aeb7393cdb4b5af62d2e4106d83124fdf (diff)
download-from-binary-cache: Use HEAD requests if possible
In "nix-env -qas", we don't need the substitute info, we just need to
know if it exists.  This can be done using a HTTP HEAD request, which
saves bandwidth.

Note however that curl currently has a bug that prevents it from
reusing HTTP connections if HEAD requests return a 404:

https://sourceforge.net/tracker/?func=detail&aid=3542731&group_id=976&atid=100976

Without the patch attached to the issue, using HEAD is actually quite
a bit slower than GET.
Diffstat (limited to 'perl/lib/Nix/Config.pm.in')
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