Looking at the code of ngx_http_spdy_module might be helpful.

On Sun, Feb 8, 2015 at 2:59 PM, Tigran Bayburtsyan
<tigran.bayburtsyan@gmail.com> wrote:
> Hi.
> I'm trying to find out, how to write module for Nginx which would be able to
> access directly to connection socket and transfer non HTTP data.
> I know that Nginx is written for specially HTTP(S) requests, but I'm
> thinking of use it as a proxy server for my custom binary protocol.
>
> Where can I find out some documentation or examples about it ?
>
> Thanks.
>
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> nginx-devel@nginx.org
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