On Wednesday 04 November 2015 20:05:21 Andrew Hutchings wrote:
> Hi Mateusz,
>
> First of all please see the caveats section of this post, you may need
> to alter your SSL configuration: https://www.nginx.com/blog/nginx-1-9-5/
>
> If this doesn't fix it then it may be that Opera doesn't support NPN
> negotiation that is in OpenSSL 1.0.1 for HTTP/2. If you recompile with
> OpenSSL 1.0.2 it will use ALPN which is actually the standard for HTTP/2.
>
> For now most browsers are supporting both negotiation types but this may
> change in the future.
>
[..]

Missing negotiation causes fallback to HTTPS, not errors.

wbr, Valentin V. Bartenev

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