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Remove NPN support and focus on ALPN (RFC 7301)
* modules/ssl/mod_ssl.c, modules/ssl/mod_ssl.h: drop
modssl_register_npn optional function and related declarations.
* modules/ssl/ssl_engine_init.c (ssl_init_ctx_callbacks):
no longer set NPN advertisement callback.
* modules/ssl/ssl_engine_io.c (ssl_io_filter_input): remove
NPN handling.
* modules/ssl/ssl_engine_kernel.c (ssl_callback_AdvertiseNextProtos):
remove callback.
* modules/ssl/ssl_private.h: remove NPN prototypes, set
HAVE_TLS_ALPN (OpenSSL 1.0.2 and later) with feature-based detection.
Rename SSLAlpnPreference to SSLALPNPreference, and add documentation.
Previous commits related to NPN and ALPN, for reference purposes:
r1332643 - Add support for TLS Next Protocol Negotiation
r1487772 - mod_ssl: Redesign NPN (Next Protocol Negotiation) API
to avoid use of hooks API and inter-module hard linkage
r1670397 - ALPN support, based on mod_spdy/mod_h2 patch set
r1670434 - More ALPN goodness
(plus some minor tweaks: r1670578, r1670440, r1670578,
r1670738, r1675459, and r1675549)
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httpd/httpd/trunk/docs/manual/mod/directives.html.en