403 Forbidden错误

```
location /frontend {
concat on;
concat_max_files 20;
concat_ignore_file_error off;
}
```

http://localhost:9080/frontend/??job.js,news.js

请问是什么原因啊，我看了下，nginx-http-concat已经编辑成功了

Start by reproducing the request to http://localhost:9080/frontend/??job.js,news.js with the shown nginx location settings and inspect the resulting nginx error details. No source file or test is named in the issue; done means identifying the cause of the 403 and documenting a verified configuration or module change that allows the requested files to be concatenated.

Written by the indexing model from the issue text.