I know that Varnish is not supposed to cache POST requests, but I
think it may be doing it anyway.
I have a very simple API that the user will pass a couple of data
fields via a POST request. Even though the post data changes, the
returned data does not.
Looking at the logs I see:
2011-10-11T20:53:27+00:00 app[web.1]: Started POST "/printed.xml"
for 172.0.0.1 at 2011-10-11 20:53:27 +0000
2011-10-11T20:53:27+00:00 app[web.1]: cache: [POST /printed.xml]
invalidate, pass
2011-10-11T20:53:27+00:00 app[web.1]: Processing by
PrintedController#index as XML
2011-10-11T20:53:27+00:00 app[web.1]: Parameters:
{"print_date"=>"2011-10-11T00:00:00Z"}
2011-10-11T20:53:27+00:00 app[web.1]: Completed 200 OK in 131ms
(Views: 16.7ms | ActiveRecord: 111.9ms)
2011-10-11T21:07:03+00:00 heroku[router]: GET
xxx-74.herokuapp.com/ dyno=web.1 queue=0 wait=0ms service=7ms
status=301 bytes=0
What does the "cache: [...] invalidate, pass" mean?
Is Varnish (or something else) caching the response? If not, then why
does the returned data not change?
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