Varnish Cache

Varnish is an open-source software brand focused on accelerating web applications through high-performance HTTP caching. Its flagship product, Varnish Cache, is a reverse caching proxy that sits between users and origin servers, serving eligible responses from memory and forwarding other requests to the origin. The software supports HTTPS with in-process TLS termination, follows standard HTTP caching conventions, and uses Varnish Configuration Language (VCL) to define programmable caching policies.

Designed for modern cloud environments, Varnish Cache is available as container images, Kubernetes Helm charts, and native packages for major DEB- and RPM-based Linux distributions. Features include dynamic backends with TLS to origin, structured logging, metrics, and tools for monitoring cache activity. Varnish Software, the company behind Varnish, also offers commercial support for organizations seeking hands-on assistance or specialized advice. Users can find documentation and community help through channels including Discord, Stack Overflow, and LinkedIn. With an emphasis on efficient delivery and flexible deployment, Varnish provides infrastructure software and related support for teams looking to improve application performance.