经常得到空的 $_POST 数据和 proxy_fcgi 错误 / Apache2 / PHP-FPM

Question

我有一个带有 PHP-FPM 的 Apache2 服务器（在 Ubuntu 20 上工作），我经常得到来自客户端的空 $_POST 数据，但标头中的 Content-Length > 0。我的流量不小 (~20 req/sec (max)在 PHP-FPM 上） 并且从一些客户端我收到一个空的 POST 请求 （它可以是 1 小时或有时 > 10）。这是我收到的示例标题：

[Content-Length] => 454
[Content-Type] => application/x-www-form-urlencoded
[User-Agent] => BestHTTP/2 v2.3.1
[Te] => identity
[Keep-Alive] => timeout=21
[Connection] => Keep-Alive, TE
[Accept-Encoding] => gzip, identity
[Host] => example.com

还有来自 $_SERVER 的一些信息：

[USER] => www-data
[HOME] => /var/www
[SCRIPT_NAME] => some/path/set_score.php
[REQUEST_URI] => some/path/set_score.php
[REQUEST_METHOD] => POST
[SERVER_PROTOCOL] => HTTP/1.1
[GATEWAY_INTERFACE] => CGI/1.1
[REMOTE_PORT] => 43852
[SCRIPT_FILENAME] => //var/www/example.com/public_html/some/path/set_score.php
[SERVER_ADMIN] => webmaster@localhost
[CONTEXT_DOCUMENT_ROOT] => /var/www/example.com/public_html/
[REQUEST_SCHEME] => https
[DOCUMENT_ROOT] => /var/www/example.com/public_html/
[REMOTE_ADDR] => **.**.***.**
[SERVER_PORT] => 443
[SERVER_ADDR] => ***.***.***.***
[SERVER_NAME] => example.com
[SERVER_SOFTWARE] => Apache
[SERVER_SIGNATURE] => <address>Apache Server at example.com Port 443</address>

[PATH] => /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin
[CONTENT_LENGTH] => 454
[CONTENT in /var/www/example.com/public_html/some/path/set_score.php on line 3

如您所见，Content-Length > 0，但 $_POST 数据数组为空。同时，这个空的 POST 请求经常伴随 proxy_fcgi 错误：

[Sun May 02 04:17:59.777441 2021] [proxy_fcgi:error] [pid 105827:tid 140667812566784] (70007)The timeout specified has expired: [client ***.***.***.***:40171] AH01075: Error dispatching request to : (reading input brigade)

此外，当发生此错误时，在 access.log 中我会看到 408 代码。 而且我不知道问题是 Apache 配置还是 PHP-FPM，因为我从客户端发送的 POST 数据很小，而且只是文本数据。奇怪的是在以前的服务器上 (cloudways) 我没有这些问题。但是现在当我做自己的服务器时，就会发生这个神奇的错误。也许他们只是忽略了这些类型的错误，或者超时值太大了。我的脚本执行时间 （我猜）。

这是我的配置中的一些重要设置：

apache2.conf

Timeout 60
KeepAlive On
MaxKeepAliveRequests 164
KeepAliveTimeout 5

HostnameLookups Off

<Directory />
        Options FollowSymLinks
        AllowOverride None
        Require all denied
</Directory>

<Directory /usr/share>
        AllowOverride None
        Require all granted
</Directory>

<Directory /var/www/>
        Options FollowSymLinks
        AllowOverride None
        Require all granted
</Directory>

/apache2/sites-available/example.com.conf

<VirtualHost *:443>
        ServerAdmin webmaster@localhost
        ServerName example.com
        ServerAlias www.example.com
        DocumentRoot /var/www/example.com/public_html/

        SSLEngine on
        SSLProtocol -all +TLSv1.2 +TLSv1.3
        SSLCertificateFile /etc/ssl/certs/example.com.crt
        SSLCertificateKeyFile /etc/ssl/private/example.com.key
        SSLCertificateChainFile /etc/ssl/certs/ca-example.com.crt

        # tried to fix that "Error dispatching request to"
        <IfModule reqtimeout_module>
                RequestReadTimeout header=20-40,minrate=150
                RequestReadTimeout body=20,minrate=150
        </IfModule>

        <FilesMatch ".+\.ph(ar|p|tml)$">
                SetHandler "proxy:unix:/run/php/php7.4-fpm-example.com.sock|fcgi://localhost/"
        </FilesMatch>
</VirtualHost>

<VirtualHost *:80>
        ServerName example.com
        ServerAlias www.example.com
        Redirect 301 / https://example.com/
</VirtualHost>

/php/7.4/fpm/pool.d/example.com.conf

[example.com]
user = www-data
group = www-data
listen = /run/php/php7.4-fpm-example.com.sock
listen.owner = www-data
listen.group = www-data

pm = dynamic
pm.max_children = 64
pm.start_servers = 16
pm.min_spare_servers = 8
pm.max_spare_servers = 16

php_admin_value[error_log] = /var/www/example.com/logs/error-fpm-php.log
php_admin_flag[log_errors] = on

Answer 1

通过从 HTTP/1.1 协议切换到 HTTP/2 修复了超时错误的外观。空 POST 请求现在很少出现，但确实如此。