nginx error log

This is the full error log.


    2019/04/19 21:48:56 [error] 23874#23874: *673 FastCGI sent in stderr: "PHP message: [Cloudflare] ERROR: [CLIENT API] Array
    (
        [type] => request
        [path] => https://api.cloudflare.com/client/v4/zones/aaff80a96a4a45dceeb4635073efce2d/purge_cache
        [timeout] => 30
        [method] => DELETE
        [headers] => Array
            (
                [X-Auth-Key] => aaaaaabbbbbbbbbccccccccccdddddddeeeee
                [X-Auth-Email] => [email protected]
                [Content-Type] => application/json
            )

        [body] => {"files":["https:\/\/www.domain.com\/category\/apps","https:\/\/www.domain.com\/category\/apps\/tools","https:\/\/www.domain.com\/tag\/camera","https:\/\/www.domain.com\/tag\/camera","https:\/\/www.domain.com\/author\/Chathu","https:\/\/www.domain.com\/author\/Chathu\/feed","https:\/\/www.domain.com","https:\/\/www.domain.com?feed=rss2","https:\/\/www.domain.com\/2018\/03\/find-camera-android-phone-free.html","http:\/\/feeds....PHP message: [Cloudflare] ERROR: [CLIENT API] Array
    (
        [type] => response
        [reason] => Bad Request
        [code] => 400
    )
     PHP message: [Cloudflare] ERROR: Bad Request" while reading response header from upstream, client: 182.161.12.56, server: domain.com, request: "POST /wp-admin/admin-ajax.php?_fs_blog_admin=true HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "www.domain.com", referrer: "https://www.domain.com/wp-admin/post.php?post=9667&action=edit"