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为什么 Apache SPA mod_rewrite 配置在正则表达式中使用点并且插入符号会导致 Apache 崩溃？

tag-icon • tag-icon apache-2.4 mod-rewrite
为什么 Apache SPA mod_rewrite 配置在正则表达式中使用点并且插入符号会导致 Apache 崩溃？

基于 mod_rewrite 的典型 Apache SPA 配置：

DocumentRoot "${webDir}"

<Directory "${webDir}">
  LogLevel rewrite:trace8

  RewriteEngine On
  RewriteCond %{SCRIPT_FILENAME} !-f
  RewriteRule . index.html [L]
</Directory>

如果我用插入符号替换最后一条规则的正则表达式：

  RewriteRule ^ index.html [L]

Apache 出现段错误http://localhost/（适用于任何非空路径）。错误日志没有可疑之处：

[rewrite:trace3] mod_rewrite.c(493): strip per-dir prefix: /home/user/work/out/ -> 
[rewrite:trace3] mod_rewrite.c(493): applying pattern '^' to uri ''
[rewrite:trace4] mod_rewrite.c(493): RewriteCond: input='/home/user/work/out/' pattern='!-f' => matched
[rewrite:trace2] mod_rewrite.c(493): rewrite '' -> 'index.html'
[rewrite:trace3] mod_rewrite.c(493): add per-dir prefix: index.html -> /home/user/work/out/index.html
[rewrite:trace2] mod_rewrite.c(493): strip document_root prefix: /home/user/work/out/index.html -> /index.html
[rewrite:trace1] mod_rewrite.c(493): internal redirect with /index.html [INTERNAL REDIRECT]

带有点的日志（不会导致崩溃）是：

[rewrite:trace3] mod_rewrite.c(493) strip per-dir prefix: /home/user/work/out/ -> 
[rewrite:trace3] mod_rewrite.c(493) applying pattern '.' to uri ''
[rewrite:trace1] mod_rewrite.c(493) pass through /home/user/work/out/
[rewrite:trace3] mod_rewrite.c(493) strip per-dir prefix: /home/user/work/out/index.html -> index.html
[rewrite:trace3] mod_rewrite.c(493) applying pattern '.' to uri 'index.html'
[rewrite:trace4] mod_rewrite.c(493) RewriteCond: input='/home/user/work/out/index.html' pattern='!-f' => not-matched
[rewrite:trace1] mod_rewrite.c(493) pass through /home/user/work/out/index.html

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