纠结： mod_gnutls 启用时不能输出 h2，禁用后使用 OpenSSL 能够输出 h2，是哪里配置错了么？

h2 这个缩写也是不错

当禁用 mod_gnutls 时：

Firefox 显示：版本： http/2.0

响应头：

Content-Encoding: gzip
Content-Length: 118
Content-Type: text/html; charset=
Date: Wed, 10 Aug 2016 02:13:43 GMT
Server: Apache/2.4.23 (Unix) OpenSSL/1.0.2h PHP/5.6.24
Vary: Accept-Encoding
X-Firefox-Spdy: h2
X-Powered-By: PHP/5.6.24

测试：

nghttp -v https://domain.org

输出：

[ 0.098] Connected
The negotiated protocol: h2
...

当启用 mod_gnutls 时：

Firefox 显示：版本： http/1.1

响应头：

Connection: Upgrade, Keep-Alive
Content-Encoding: gzip
Content-Length: 118
Content-Type: text/html; charset=
Date: Wed, 10 Aug 2016 02:30:22 GMT
Keep-Alive: timeout=5, max=100
Server: Apache/2.4.23 (Unix) OpenSSL/1.0.2h PHP/5.6.24 mod_gnutls/0.7.5 GnuTLS/3.5.2
Upgrade: h2
Vary: Accept-Encoding
X-Powered-By: PHP/5.6.24

测试：

nghttp -v https://domain.org

输出：

[ 0.240] Connected
The negotiated protocol: http/1.1
[ERROR] HTTP/2 protocol was not selected. (nghttp2 expects h2)
Some requests were not processed. total=1, processed=0

怎样才能在使用 mod_gnutls 的情况下也能支持 HTTP/2 。

去瞅了一眼 mod_h2 的代码, 不可能. 代码已经写死用 mod_ssl 了.

另外 nghttp2 也是 openssl/libressl only 的项目, 只是有人尝试用过 gnutls.