Issue
This question might sound stupid but is a CURL request made in PHP code on server, visible to a visitor/user or the browser. Can the user debug the contents of the curl request. I tried to debug it in chrome but it was not visible and this answer is not available on the internet. Hence, I am asking it here.
Solution
No, a visitor to your site cannot see what is happening in the server side code. It may not even be apparent to them that you're making a server side request to another site.
You should ensure your PHP code is making use of the curl_error() function to determine what happened with the request and assist with your debugging.
Answered By - Tom