Rails assets, client requesting expired assets -

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i have rails (4.1.5) app deployed on heroku , monitored newrelic. in last 24 hours site has gone having < 3% errors on newrelic having ~30% errors , errors requests expired javascript , css assets. have not deployed site in on month assets shouldn't have changed.

my question two-fold;
first, why getting load of requests expired asset?
second, rails way handle request expired asset , redirect current asset?


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