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The Caddy

Caddy is an open-source, cross-platform web server written in Go. It differentiates itself from other web servers through its automatic HTTPS configuration using Let's Encrypt, its ease of use, and its modern configuration file format (Caddyfile).

Overview

Caddy is designed to be a user-friendly and secure web server. Key features include:

  • Automatic HTTPS: Caddy automatically obtains and renews TLS certificates from Let's Encrypt or other ACME CAs, simplifying the process of securing websites with HTTPS.
  • Modern Configuration: The Caddyfile is a human-readable configuration file that is easier to learn and use compared to traditional web server configurations.
  • Extensibility: Caddy can be extended with plugins, allowing users to add custom functionality and support for various protocols and features.
  • Cross-Platform Compatibility: Caddy is available for Windows, macOS, Linux, and other platforms.
  • HTTP/3 Support: Caddy supports the latest HTTP/3 protocol for improved performance and reliability.
  • Reverse Proxy: Caddy can act as a reverse proxy, forwarding requests to backend servers.
  • Load Balancing: Caddy can distribute traffic across multiple backend servers to improve performance and availability.
  • Built-in Metrics: Caddy provides built-in metrics for monitoring server performance.

History

Caddy was created by Matthew Holt and released in 2015. It was designed to address the complexities and security concerns associated with configuring traditional web servers. The project has evolved significantly over time, with major version releases introducing new features and improvements.

Configuration

Caddy's configuration is primarily managed through the Caddyfile. The Caddyfile uses a simple, declarative syntax to define site configurations, including domain names, TLS settings, and request handling directives. Caddy can also be configured via JSON.

Use Cases

Caddy is suitable for a variety of use cases, including:

  • Serving static websites
  • Acting as a reverse proxy for web applications
  • Providing TLS termination for backend servers
  • Load balancing traffic across multiple servers
  • Serving as a development server for testing web applications

Alternatives

Alternatives to Caddy include:

  • Apache HTTP Server
  • Nginx
  • Microsoft IIS

Caddy distinguishes itself from these alternatives through its automatic HTTPS configuration and user-friendly configuration format.

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