The plain HTTP request was sent to HTTPS port.
In computer networking, an HTTP (Hypertext Transfer Protocol) request is a request made by a client to send data over the internet. The server responds with its own response, which includes the requested data.
For instance, when a client sends an HTTP GET request to a server, the server returns a response with a status code indicating success or failure.
The provided URLs appear to be links to various conferences hosted by Stanford Law School. These events often focus on topics related to computer networking and cybersecurity.