What's the net::ERR_HTTP2_PROTOCOL_ERROR about?

net::ERR_HTTP2_PROTOCOL_ERROR is an error that occurs in the Google Chrome browser when there is an issue with the HTTP/2 protocol. This error is usually accompanied by the message "Error code: HTTP2_PROTOCOL_ERROR".

The HTTP/2 protocol is a newer version of the HTTP protocol designed to improve web communication's speed and efficiency. It allows multiple requests to be sent over a single connection and can improve the performance of websites by making it faster to load content.

If you see the net::ERR_HTTP2_PROTOCOL_ERROR error, it could be due to a problem with the server that is serving the content, or it could be a problem with the client (i.e., your browser). Some common causes of this error include:

  • The server is using an outdated HTTP/2 protocol incompatible with your browser.
  • The server is using a version of the HTTP/2 protocol that has known security vulnerabilities.
  • There is a problem with the network connection between the client and the server.
  • The client or server is using an outdated or misconfigured TLS (Transport Layer Security) certificate.

If you are seeing this error and are using PHP, the issue may be related to how your PHP code interacts with the server. For example, if you are using the curl library to make HTTP requests, it could be that the curl library is not properly configured to use the HTTP/2 protocol. In this case, you may need to update your PHP code to use the latest version of the curl library or to explicitly specify that you want to use the HTTP/2 protocol.