Nginx错误：attempt to set status 403 via ngx.exit after sending out the response status 200

1. 第三方nginx 防火墙，触发，解决方法 关闭或者修改 规则
https://blog.csdn.net/qq_38883889/article/details/128192632?utm_medium=distribute.pc_relevant.none-task-blog-2~default~baidujs_baidulandingword~default-0-128192632-blog-126101689.235^v40^pc_relevant_3m_sort_dl_base2&spm=1001.2101.3001.4242.1&utm_relevant_index=3

2. 前端返回的错误：'Access-Control-Allow-Origin' header is present on the requested resource.

   可能的原因：

　1. 跨域

   2. client_max_body_size