Use a HEAD request rather than POST to get headers
Use a HEAD request rather than POST to get headers

I introduced this bug when I ported Oz to python-requests.

Signed-off-by: Patrick Uiterwijk <bd6d5394796bee9cca2245486eb583fd64b70226@redhat.com>

nullr0ute/oz,imcleod/oz,clalancette/oz,nullr0ute/oz,imcleod/oz,clalancette/oz