hata | CyberSEO Pro | Support Forum

As far as I can see the post was added successfully and the image was generated as well.

The cURL error "HTTP/2 stream 0 was not closed cleanly: PROTOCOL_ERROR (err 1)" indicates that there was an issue with the HTTP/2 protocol while processing the request. This error is related to the way the server and client communicate over HTTP/2, and it usually happens when there's a violation of the protocol by either the server or the client.

In this specific case, the "PROTOCOL_ERROR" means that there was a violation of the HTTP/2 protocol by the server or the client. This can occur due to various reasons, such as:

1. The server or client sending a malformed frame that doesn't conform to the HTTP/2 specification.
2. The server or client using an unsupported frame type.
3. The server or client sending a frame with an invalid size.
4. The server or client violating the flow control rules.

This means that the server you are connecting does not support HTTP/2 correctly. Also make sure your cURL library and PHP are up to date, as older versions might not support HTTP/2 correctly or have known issues.