What is TLS sendfile()?

TLS sendfile is a feature implemented in some web servers that allows a web server to send encrypted data directly from a file to the client without first loading it into the server's memory. This can improve server performance because less memory is required and the web server can handle multiple concurrent connections more efficiently.

The TLS sendfile is an extension of the standard sendfile function, which is normally used to send unencrypted files from the server to the client. The advantage of TLS sendfile is that encrypted data can be sent directly from disk to the client without the web server having to decrypt the data first and cache it in memory. This leads to improved performance and lower server load.