HTTP Error when upload file

Hi All,

I’m facing an issue while uploading files, our server run behind cloudflare so the HTTP error appears if you upload file through internet, but there is no error appear through intranet, we check cloudflare and find that there is an XSS challenge on this path $$$call$$$/wizard/file-upload/file-upload-wizard/upload-file

OJS version 3.3.0-13