net::ERR_CONNECTION_CLOSED error at Chrome with HTTP2.0 + Nginx
<p>How to handle net::ERR_CONNECTION_CLOSED error in Google Chrome (v.51.0) when I try POST images on server (with jQuery or Dropzone.js) by https.</p>

<p>Firefox work great on http and https. Chrome only http. Everything without file uploading works fine on Chrome+HTTPS. I'm getting this error after php timeout ends:</p>

<pre><code>dropzone.min.js:1 POST https://{example.com}/images/upload net::ERR_CONNECTION_CLOSED
</code></pre>

<p>No other messages. Nothing at PHP and Nginx logs.</p>

<p>My server: PHP 7.0.9 + Nginx 1.10 + Ubuntu Server 16.04 + HTTP2.0 with SSL cert by Comodo.</p>

<p><strong>UPDATED</strong></p>

<p><a href="https://serverfault.com/questions/775298/debian-jessie-nginx-with-openssl-1-0-2-to-use-alpn-rather-than-npn">I found the problem and solution.</a></p>