Think this issue of Amazon ELB. According
[RFC7540](https://tools.ietf.org/html/rfc7540#section-8.1.3) examples server
must return HTTP protocol version same as request.
* Request
```
POST /resource HTTP/1.1
```
Responce must be
```
HTTP/1.1 200 OK
```
Amazon returns
```
HTTP/2 200
```
Wrong version and `OK` is not present.
I will close ticket.
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