擅长:python、mysql、java
<p>看起来它在没有收到任何流量的30分钟超时后休眠</p>
<blockquote>
<p>If an app has a free web dyno, and that dyno receives no web traffic
in a 30-minute period, it will sleep. In addition to the web dyno
sleeping, the worker dyno (if present) will also sleep.</p>
<p>Free web dynos do not consume free dyno hours while sleeping.</p>
<p>If a sleeping web dyno receives web traffic, it will become active
again after a short delay (assuming your account has free dyno hours
available).</p>
</blockquote>
<p><a href="https://devcenter.heroku.com/articles/free-dyno-hours" rel="nofollow noreferrer">Source</a></p>