在官方wiki找到的

fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name

在alias下路径报错

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fastcgi_param SCRIPT_FILENAME $request_filename

index取值忽略fastcgi_index的设定, 直接取http或者server字段下的index设定值.

https://www.nginx.com/resources/wiki/start/topics/tutorials/config_pitfalls/