PHP和Nginx组合,页面发送Ajax请求出现502 | inRush

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http://inrush.me/2017/08/23/PHP%E5%92%8CNginx%E7%BB%84%E5%90%88-%E9%A1%B5%E9%9D%A2%E5%8F%91%E9%80%81Ajax%E8%AF%B7%E6%B1%82%E5%87%BA%E7%8E%B0502/