misconfigured `servlet-root` leads to confusing state
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调研方向
使用文件根目录 "htdocs" 和 servlet 根目录 "." 重现该配置，然后跟踪报告行附近的 filesystem-map.rkt 循环以及链接的 Racket issue 5488。确定配置错误在哪里被吞掉，并考虑 Web 服务器如何提供清晰的响应，而不是通用的文件未找到页面。
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描述
I am trying to move an old use of the web server (from version 3.99 approx) to the new web server library and it has a configuration table that gets used via configuration-table->sexpr. In that configuration, file-root is set to "htdocs" and servlet-root is set to ".", but in the actual file system, the servlets are in the directory that contains "htdocs". That is, the correct configuration should have been setting servlet-root to ".." (or moving the servlets I suppose).
The problem, however, is that this configuration did not result an a sensible error message or even any error message. Instead, what happens is that an attempt to run the servlets results in a web page that says “The file you were looking for was not found on this server.”. This seems to be happening because there are some error-swallowing handlers that are pretty misleading. The real troublesome one seems to be the one in this loop that causes the web server to iterate through all of the path components of the url and eventually terminate due to this error.
I'm not sure of the best approach to dealing with this, but some thought towards a better response from the webserver to a similar kind of misconfiguration would be much appreciated. It doesn't have to be anything particularly sophisticated but tracing through what happened in the code to understand my misconfiguration was not a nice experience! 😅
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