以前这么配置：
... RewriteLog logs/gidapp.rewrite_log RewriteLogLevel 3 RewriteEngine On ... LogLevel warn ...
改为：
...
RewriteEngine On
...
LogLevel warn rewrite:trace3
...
查看日志：
tail -f /usr/local/apache/logs/error_log [Sat Mar 21 08:21:34.518820 2020] [rewrite:trace3] [pid 5618:tid 2482998080] mod_rewrite.c(483): ....
调试完还是关掉的好，避免增加服务器负载。
From the official Apache 2.4 Documentation page: Apache Module mod_rewrite