mod_ssl is used by 0.09% of sites

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Web Server Extensions
mod_ssl is an Apache HTTP Server module that provides SSL/TLS encryption and authentication capabilities. It is responsible for enabling secure HTTPS connections between clients (web browsers) and the Apache server.

Here are some key features and functionalities of mod_ssl:

SSL/TLS Support: mod_ssl allows Apache to handle secure communications using the SSL (Secure Sockets Layer) and TLS (Transport Layer Security) protocols. It provides encryption, decryption, and secure data transfer capabilities.

SSL Certificate Configuration: mod_ssl enables you to configure SSL certificates for your Apache server. This includes generating or obtaining SSL certificates, configuring their locations, and specifying various SSL-related settings such as the private key, certificate chain, and SSL protocol versions.

Encryption and Authentication: With mod_ssl, you can enforce secure connections between clients and the server by encrypting the data transmitted over the network. It also enables server authentication using SSL certificates, allowing clients to verify the identity of the server they are connecting to.

Virtual Host Support: mod_ssl supports SSL/TLS configuration on a per-virtual-host basis. This means you can have multiple SSL-enabled websites hosted on the same Apache server, each with its own SSL certificate and configuration.

SSL Session Caching: To optimize SSL/TLS performance, mod_ssl includes a session cache mechanism that allows the server to reuse previously negotiated SSL sessions. This can significantly reduce the SSL handshake overhead for subsequent connections.

Cipher Suite Configuration: mod_ssl provides options to configure the supported SSL/TLS cipher suites. This allows you to control the encryption algorithms and security protocols that the server will negotiate with clients.

SSL Environment Variables: mod_ssl sets various environment variables that can be utilized within Apache configuration files or web applications. These variables contain information related to SSL/TLS connections, such as client certificate details, cipher suite, and SSL protocol version.

mod_ssl is a widely used module for enabling SSL/TLS encryption and secure communication in Apache HTTP Server. It plays a crucial role in securing web applications and protecting sensitive data transmitted over the network.