Webtatic has now released Nginx 1.10.3 for RHEL/CentOS 7.3 as a new set of packages and dynamic modules, including pagespeed and headers_more. Significantly it also will support both SPDY 3.1 and HTTP2 (although the latter browsers wont use until a future release of RHEL 7.4).
This release will, unlike Webtatic's previous Nginx releases, follow all Nginx 1 stable minor releases, rather than just bugfix releases. (So for example if Nginx 1.12 is released, these packages will upgrade to that).
Continuing Nginx with the release of 1.10 with SPDY removed and HTTP2 added in gave a complex non-backwards compatible change:
* SPDY removed, so for example older Android devices could no longer benefit from the performance improvements.
* HTTP2 added, however RHEL/CentOS 6 and 7's openssl doesn't yet support the TLS ALPN extension to negotiate http protocol version. This means newer and newest browsers can't yet benefit from HTTP2 on this OS distribution.
For the former, Webtatic has reintroduced SPDY using patches Cloudflare created to add it to their own Nginx servers. Cloudflare provides the patch open source. It may be removed from Webtatic's releases later (e.g. if it becomes unmaintained).
For the latter, Webtatic aims to resolve as soon as an official RHEL/CentOS openssl upgrade becomes available and supported by them. Redhat are planning to do this as part of their RHEL 7.4 release, but this may be released. between half a year to a year from now.
Given Redhat has no plans to provide an openssl upgrade for RHEL/CentOS 6, Webtatic will no longer provide Nginx releases for that distro version.