Faster reproducer:
# working case without proxy:
$ python -c 'import jockey.detection; from jockey.oslib import OSLib;
OSLib.inst = OSLib(); print
jockey.detection.OpenPrintingDriverDB._check_get_fingerprint("https://linux.avasys.jp/drivers/lsb/epson-inkjet/key/fingerprint")'
E522 0FB7 014D 0FBD A50D FC2B E5E8 6C00 8AA6 5D56
# failing case with proxy:
$ http_proxy="http://localhost:3128/" https_proxy="https://localhost:3128/"
python -c 'import jockey.detection; from jockey.oslib import OSLib; OSLib.inst
= OSLib(); print
jockey.detection.OpenPrintingDriverDB._check_get_fingerprint("https://linux.avasys.jp/drivers/lsb/epson-inkjet/key/fingerprint")'
WARNING:root:https://linux.avasys.jp/drivers/lsb/epson-inkjet/key/fingerprint
has invalid certificate, ignoring driver: Host localhost:3128 returned an
invalid certificate (_ssl.c:499: error:140770FC:SSL
routines:SSL23_GET_SERVER_HELLO:unknown protocol)
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https://bugs.launchpad.net/bugs/729185
Title:
fingerprint SSL check does not work behind a proxy
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