Caddy is a Go-based web server and application platform that is designed to make HTTPS the default and to manage modern HTTP serving with minimal operational friction.
Caddy is an extensible server platform, best known as an HTTP server that supports HTTP/1.1, HTTP/2, and HTTP/3. It is commonly used to serve websites over HTTPS, but the README also frames it more broadly as a platform for running long-lived Go applications through modular "apps". It supports configuration through the Caddyfile, native JSON, a JSON API, and config adapters.
It addresses the complexity of running modern web services securely, especially the burden of HTTPS, certificate handling, and configuration management. The project aims to make secure-by-default serving easier, while still supporting dynamic changes and advanced setups for production environments.
Conceptually, Caddy works by combining a core server with modular components that handle HTTP and TLS-related behavior. It can automatically obtain and manage certificates for public names, provide a managed local CA for internal names and IPs, and accept configuration through multiple formats or via API updates. The README also says it can coordinate with other Caddy instances in a cluster and use issuer fallback when needed.
It is gaining attention because it sits at the intersection of secure web serving, modern protocol support, and developer-friendly operations. The repository description and README emphasize automatic HTTPS, support for HTTP/3, strong extensibility, cross-platform use, and a large production track record, all of which are attractive in current infrastructure and DevOps workflows.
The README does not list direct competitors, but comparable approaches include other HTTP servers and reverse proxies used for HTTPS serving and routing. Based on the repository topics and description, likely points of comparison are servers or proxies that handle TLS, reverse proxying, and HTTP/1-2-3 traffic, though no specific alternatives are named in the provided material.
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