[1] File: SPEC (2009-03-25 22:25:13 +09:00 版) <http://rack.rubyforge.org/doc/files/SPEC.html>

[2] File: SPEC ['Rack Documentation'] ( (2010-01-11 00:57:50 +09:00 版)) <http://rack.rubyforge.org/doc/SPEC.html>