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

In my case (curl 7.47.0), it is because I set the header content-length on curl command manually with a value which is calculated by postman (I used postman to generate curl command parameters and copy them to shell). After I delete header content-length, it works normally.