/etc/l7-protocols/extra/httpcachemiss.pat is in l7-protocols 20090528-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | # HTTP - Proxy Cache miss for HyperText Transfer Protocol (RFC 2616)
# Pattern attributes: good notsofast notsofast subset
# Protocol groups: document_retrieval ietf_draft_standard
# Wiki: http://protocolinfo.org/wiki/HTTP
# Copyright (C) 2008 Matthew Strait, Ethan Sommer; See ../LICENSE
#
# Usually runs on port 80
#
# This pattern has been tested and is believed to work well.
#
# To get or provide more information about this protocol and/or pattern:
# http://www.protocolinfo.org/wiki/HTTP
# http://lists.sourceforge.net/lists/listinfo/l7-filter-developers
httpcachemiss
http/(0\.9|1\.0|1\.1)[\x09-\x0d ][1-5][0-9][0-9][\x09-\x0d -~]*(x-cache: miss)
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