Please read the section about timeouts in https://blog.cloudflare.com/exposing-go-on-the-internet/ very carefully. This should explain your file descriptor issues. The broken pipe and connection resets are probably clients that closed connections because of timeouts on their side, which may a hint that you have performance issues on the server. You should load test your development server before rollout to production. Apache JMeter or Selenium that are popular with Java developers. Go has Vegeta, but I have never used it.
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