<p>Think this issue of Amazon ELB. According <a href="https://tools.ietf.org/html/rfc7540#section-8.1.3" rel="nofollow">RFC7540</a> examples server must return HTTP protocol version same as request.</p>
<ul>
<li>Request</li>
</ul>
<pre><code>POST /resource HTTP/1.1
</code></pre>
<p>Responce must be</p>
<pre><code>HTTP/1.1 200 OK
</code></pre>
<p>Amazon returns</p>
<pre><code>HTTP/2 200
</code></pre>
<p>Wrong version and <code>OK</code> is not present.<br>
I will close ticket.</p>

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