在看似正确的安装之后，HTTP/2 似乎并未运行。
我运行的是 CentOS 7。
我安装了最新版本的 Apache（版本 httpd-2.4.35-5.el7.x86_64），并一直在尝试让 HTTP/2 正常工作。
为此，我发现我们需要运行 http2_module。那是活跃的并且正在运行。我相信已经通过运行命令确认了这一点httpd -M。 http2_module（共享）列在这些模块下。
我知道要做的下一件事是添加Protocols h2 h2c http/1.1上面的<VirtualHost ...>标签。我也这样做过。
最后，我已经弯曲了我的 URL，并且仍然得到 HTTP/1.1。
卷曲命令：curl -vsko /dev/null --http2 https://www.thehomepainter.com
CURL 的简短回应：
获取/HTTP/1.1
主办方：www.thehomepainter.com
用户代理：curl/7.64.0
接受：/
部分来自 httpd.conf
Protocols h2 h2c http/1.1
<VirtualHost *:443>
SSLEngine on
ServerAdmin ### omitted ###
ServerName thehomepainter.com
ServerAlias www.thehomepainter.com
DocumentRoot /var/www/html/
Options -Indexes
ProxyRequests off
ProxyPreserveHost On
AllowEncodedSlashes NoDecode
ProxyPass "/" "http://localhost:3000/"
ProxyPassReverse "/" "http://localhost:3000/"
RequestHeader set X-Forwarded-Proto "https"
RequestHeader set X-Forwarded-Port "443"
Include /etc/letsencrypt/options-ssl-apache.conf
SSLCertificateFile ### omitted ###
SSLCertificateKeyFile ### omitted ###
SSLCertificateChainFile ### omitted ###
# i have tried this here as well
# Protocols h2 h2c http/1.1
</VirtualHost>
Protocols h2 h2c http/1.1
<VirtualHost *:80>
ServerAdmin [email protected] /cdn-cgi/l/email-protection
ServerName thehomepainter.com
ServerAlias www.thehomepainter.com
DocumentRoot /var/www/html
RewriteEngine on
RewriteCond %{SERVER_NAME} =thehomepainter.com [OR]
RewriteCond %{SERVER_NAME} =www.thehomepainter.com
RewriteRule ^ https://%{SERVER_NAME}%{REQUEST_URI} [END,NE,R=permanent]
# i have tried this here as well
# Protocols h2 h2c http/1.1
</VirtualHost>
所以预期的结果是 HTTP/2 能够正常工作。然而事实并非如此，我也不知道为什么。
翻阅错误日志后，我终于找到了问题所在。
[http2:warn] [pid 7155] AH10034: The mpm module (prefork.c) is not supported by mod_http2. The mpm determines how things are processed in your server. HTTP/2 has more demands in this regard and the currently selected mpm will just not do. This is an advisory warning. Your server will continue to work, but the HTTP/2 protocol will be inactive.
为了解决这个问题，我编辑了 /etc/httpd/conf.modules.d/00-mpm.conf
注释掉这一行：LoadModule mpm_prefork_module modules/mod_mpm_prefork.so
并取消注释底线：LoadModule mpm_event_module modules/mod_mpm_event.so
重启apache然后就可以了。
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