What is the curl error 52 “empty reply from server”?

Question

I have a cron job setup on one server to run a backup script in PHP that is hosted on another server.

The command I\'ve been using is

curl -sS http://w         


        

Answer 1

It can happen when server does not respond due to 100% CPU or Memory utilization.

I got this error when I was trying to access sonarqube API and the server was not responding due to full memory utilization

Answer 2

this error also can happen if the server is processing the data. It usually happens to me when I do post some files to REST API websites that have many entries and take long for the records creation and return

Answer 3

you can try this curl -sS "http://www.example.com/backup.php" by putting your URL into "" that worked for me I don't know the exact reason but I suppose that putting the url into "" completes the request to the server or just completes the header request.