nginx include 语句后面如何使用变量

Question

如

include $document_root/aaa.txt;

会报错误
open() "/etc/nginx/$document_root/aaa.txt" failed (2: No such file or directory) in /etc/nginx/nginx.conf:xxx

include后面的变量并未被解析

Answer 1

include的时候还没变量吧，变量是很后面才有的。