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我在Heroku上托管Rails应用程序，不知道我的静态图像是否被缓存。以下是我的三次加载相同图像的日志。最后两个请求是从缓存中提供的吗？ “陈旧，无效，存储”是什么意思？如何知道图像是否正确缓存？
这些都只是静态的资产，如您似乎未在雪松堆栈上运行我没有使用Rails中3.1
2012-01-24T03:37:27+00:00 app[web.1]: cache: [GET /images/offer-new-reward-button.png?1327376077] miss, store
2012-01-24T03:37:27+00:00 heroku[nginx]: (ip) - - [24/Jan/2012:03:37:27 +0000] "GET /images/offer-new-reward-button.png?1327376077 HTTP/1.1" 200 3692 "-" "curl/7.21.4 (universal-apple-darwin11.0) libcurl/7.21.4 OpenSSL/0.9.8r zlib/1.2.5" myapp.heroku.com
2012-01-24T03:37:27+00:00 heroku[router]: GET myapp.heroku.com/images/offer-new-reward-button.png dyno=web.1 queue=0 wait=0ms service=8ms status=200 bytes=3692
2012-01-24T03:37:52+00:00 app[web.1]: cache: [GET /images/offer-new-reward-button.png?1327376077] stale, invalid, store
2012-01-24T03:37:52+00:00 heroku[nginx]: (ip) - - [24/Jan/2012:03:37:52 +0000] "GET /images/offer-new-reward-button.png?1327376077 HTTP/1.1" 200 3692 "-" "curl/7.21.4 (universal-apple-darwin11.0) libcurl/7.21.4 OpenSSL/0.9.8r zlib/1.2.5" myapp.heroku.com
2012-01-24T03:37:52+00:00 heroku[router]: GET myapp.heroku.com/images/offer-new-reward-button.png dyno=web.1 queue=0 wait=0ms service=6ms status=200 bytes=3692
2012-01-24T03:38:25+00:00 app[web.1]: cache: [GET /images/offer-new-reward-button.png?1327376077] stale, invalid, store
2012-01-24T03:38:25+00:00 heroku[router]: GET myapp.heroku.com/images/offer-new-reward-button.png dyno=web.1 queue=0 wait=0ms service=7ms status=200 bytes=3692
2012-01-24T03:38:25+00:00 heroku[nginx]: (ip) - - [24/Jan/2012:03:38:25 +0000] "GET /images/offer-new-reward-button.png?1327376077 HTTP/1.1" 200 3692 "-" "curl/7.21.4 (universal-apple-darwin11.0) libcurl/7.21.4 OpenSSL/0.9.8r zlib/1.2.5" myapp.heroku.com