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The http2 module adds support for the HTTP/2 protocol to the server.
Specifically, it supports the protocols "h2" (HTTP2 over TLS) and "h2c"
(HTTP2 over plain HTTP connections via Upgrade). Additionally it offers
the "direct" mode for both encrypted and unencrypted connections.
You may enable it for the whole server or specific virtual hosts only.
BUILD
If you have libnghttp2 (https://nghttp2.org) installed on your system, simply
add
--enable-http2
to your httpd ./configure invocation. Should libnghttp2 reside in a unusual
location, add
--with-nghttp2=<path>
to ./configure. <path> is expected to be the installation prefix, so there
should be a <path>/lib/libnghttp2.*. If your system support pkg-config,
<path>/lib/pkgconfig/libnghttp2.pc will be inspected.
If you want to link nghttp2 statically into the mod_http2 module, you may
similarly to mod_ssl add
--enable-nghttp2-staticlib-deps
For this, the lib directory should only contain the libnghttp2.a, not its
shared cousins.
CONFIGURATION
If mod_http2 is enabled for a site or not depends on the new "Protocols"
directive. This directive list all protocols enabled for a server or
virtual host.
If you do not specify "Protocols" all available protocols are enabled. For
sites using TLS, the protocol supported by mod_http2 is "h2". For cleartext
http:, the offered protocol is "h2c".
The following is an example of a server that only supports http/1.1 in
general and offers h2 for a specific virtual host.
...
Protocols http/1.1
<virtualhost *:443>
Protocols h2 http/1.1
...
</virtualhost>
Please see the documentation of mod_http2 for a complete list and explanation
of all options.
TLS CONFIGURATION
If you want to use HTTP/2 with a browser, most modern browsers will support
it without further configuration. However, browsers so far only support
HTTP/2 over TLS and are especially picky about the certificate and
encryption ciphers used.
Server admins may look for up-to-date information about "modern" TLS
compatibility under:
https://wiki.mozilla.org/Security/Server_Side_TLS#Modern_compatibility
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