Understanding and Resolving the curl (52) Empty Reply from Server Error

Causes and Fixes for curl (52) Empty Reply from Server

1. Using a Very Old Version of libcurl

   Cause: Using an old version of libcurl is a common reason for the “curl (52) empty reply from server” error.

   Fix: The version of libcurl should be updated to the most recent stable release. By upgrading, your curl calls will work better with the server, and you’ll be less likely to get this error.

2. Network or Firewall Restrictions

   Cause: The “empty reply” error happens when the server doesn’t react to curl requests because of the way the network or firewall is set up.

   Fix: Our Support Engineers say to check the firewall rules and make sure that the necessary ports and services (like HTTP and HTTPS) are allowed in the firewall. By allowing the necessary network flow, you can fix this problem and get your client and server to talk to each other.

3. oopback Request Failure in WordPress

   Cause: The “curl (52) empty reply from server” problem might happen when loopback requests fail for WordPress users. Loopback requests are used to run events on a plan and check that the code in themes and plugins is stable.

   Fix: Add the code below to your “wp-config.php” file and save it to fix this:

   php define('ALTERNATE_WP_CRON', true);

   
By using this alternative Cron job system, you can fix problems with failed loopback requests and bring back the functions that depend on the

4. The Port Number in the curl URL is Wrong

   Cause: The “empty reply” mistake can happen if you use a specific port assignment in the curl URL in the wrong way.

   Fix: We suggest using the right port for the server to talk to the computer. Make sure the port in the URL matches the port where the server is constantly listening for requests to come in.

5. Using Plain HTTP on a HTTPS Server

   Cause: The “curl (52) empty reply from server” problem can happen if you try to use plain HTTP on a server that needs HTTPS.

   Fix: To fix this problem, change your curl script to use HTTPS instead of HTTP. This will make sure that all of your messages to the computer are encrypted and safe.

6. Server Redirection Issues

   Cause: The error could be caused by the server changing the path, so the curl script doesn’t go where it’s supposed to.

   Fix: We suggest using the ‘-L’ option in your curl script to fix this. The “-L” flag tells curl to follow any redirects from the server and get to the right endpoint, which fixes the “empty reply” problem.

Conclusion

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