⚠️ CRITICAL SECURITY NOTICE (February 2026)
6 CVEs fixed in Caddy v2.11.1: FastCGI RCE, CSRF bypass, TLS auth fail-open, and more. All users should upgrade immediately. See Security for details.
Caddy is a powerful, enterprise-ready, open-source web server with automatic HTTPS written in Go. It is designed to be simple, secure, and fast. Caddy can serve static files, reverse proxy to other servers, and provide a variety of other features.
Caddy stands out due to its simplicity and ease of use. Unlike other web servers that require complex configuration files and manual certificate management, Caddy automates these processes, making it an excellent choice for both beginners and experienced administrators. Its modular architecture allows for extensive customization through plugins, enabling users to tailor the server to their specific needs. Additionally, Caddy’s native support for HTTP/2 and its cross-platform compatibility ensure that it can be deployed in a wide range of environments. Whether you are hosting a small personal website or managing a large-scale enterprise application, Caddy provides the tools and features necessary to ensure a secure and efficient web server experience.
- Current stable: Caddy 2.11.1 (2026-02-23) - CRITICAL SECURITY UPDATE
- Previous stable: 2.10.2 (2025-08-23)
- Release notes: 6 CVEs fixed including FastCGI RCE, CSRF bypass, TLS auth fail-open
⚠️ URGENT: All users should upgrade to v2.11.1 immediately due to 6 security vulnerabilities fixed in this release.
Caddy v2.10.x introduces several important enterprise-grade features:
- Encrypted ClientHello (ECH): Encrypts the last plaintext portion of a TLS connection for enhanced privacy
- Post-quantum (PQC) key exchange: Support for the standardized x25519mlkem768 cryptographic group
- ACME profiles: Support for experimental draft allowing more flexible certificate properties
- Global DNS provider: Ability to specify a default DNS module instead of configuring it locally everywhere
- Wildcard certificate optimization: Wildcards are now used by default for subdomains instead of individual certificates
- Updated libdns 1.0 APIs: Improved interfaces for DNS provider modules
- Automatic HTTPS with minimal configuration.
- Modern reverse proxy and API gateway use cases.
- Quick, secure defaults for small-to-medium deployments.
Caddy v2.10+ includes cutting-edge security features:
- Encrypted ClientHello (ECH): Encrypts the ClientHello message in TLS handshakes, hiding server identity and SNI from passive observers
- Post-Quantum Cryptography (PQC): Implements the x25519mlkem768 key exchange algorithm for quantum-resistant security
- Automatic Security Headers: Built-in support for modern security headers including HSTS, CSP, and more
- Privacy-First Architecture: Designed with privacy considerations at every level
- Automatic HTTPS: Caddy automatically manages TLS certificates using Let’s Encrypt.
- Extensible: Caddy’s modular architecture allows you to extend its functionality with plugins.
- Easy Configuration: Caddy uses a simple, human-readable configuration file.
- HTTP/2 Support: Caddy supports HTTP/2 out of the box.
- HTTP/3 and QUIC: Native support for HTTP/3 over QUIC protocol for improved performance and reduced latency.
- Cross-Platform: Caddy runs on Windows, macOS, Linux, BSD, and Android.
- Advanced Security: Includes support for Encrypted ClientHello (ECH) and Post-Quantum Cryptography (PQC).
| Feature |
Caddy |
Apache2 |
Nginx |
Lighttpd |
HAProxy |
| Automatic HTTPS |
✅ Yes (built-in) |
❌ No (requires manual setup) |
❌ No (requires manual setup) |
❌ No (requires manual setup) |
❌ No (requires manual setup) |
| Ease of Configuration |
⭐⭐⭐⭐⭐ Simple, human-readable |
⭐⭐ Moderate, complex XML-like |
⭐⭐ Moderate, block-based |
⭐⭐⭐ Relatively simple |
⭐⭐⭐⭐ Moderately complex |
| Performance |
⭐⭐⭐⭐ High |
⭐⭐⭐ Moderate |
⭐⭐⭐⭐⭐ Very High |
⭐⭐⭐⭐ High |
⭐⭐⭐⭐⭐ Very High |
| Resource Usage |
⭐⭐⭐⭐ Low-Moderate |
⭐⭐ High |
⭐⭐⭐⭐⭐ Very Low |
⭐⭐⭐⭐⭐ Very Low |
⭐⭐⭐⭐ Low |
| Static Content Delivery |
⭐⭐⭐⭐ Good |
⭐⭐⭐ Good |
⭐⭐⭐⭐⭐ Excellent |
⭐⭐⭐⭐⭐ Excellent |
⭐⭐⭐⭐ Good |
| Reverse Proxy |
⭐⭐⭐⭐ Good |
⭐⭐⭐ Good (with mod_proxy) |
⭐⭐⭐⭐⭐ Excellent |
⭐⭐⭐ Good |
⭐⭐⭐⭐⭐ Excellent |
| Load Balancing |
⭐⭐⭐⭐ Good |
⭐⭐ Limited (requires modules) |
⭐⭐⭐⭐⭐ Excellent |
⭐⭐ Limited |
⭐⭐⭐⭐⭐ Excellent |
| HTTP/2 Support |
⭐⭐⭐⭐⭐ Native |
⭐⭐⭐⭐ Yes (with mod_http2) |
⭐⭐⭐⭐⭐ Native |
⭐⭐⭐⭐ Yes |
⭐⭐⭐⭐ Yes |
| HTTP/3 Support |
⭐⭐⭐⭐⭐ Native (QUIC) |
❌ No native |
⭐⭐⭐⭐ Experimental |
⭐⭐⭐ Experimental |
⭐⭐⭐ Experimental |
| SSL/TLS Termination |
⭐⭐⭐⭐⭐ Automated |
⭐⭐⭐ Manual setup |
⭐⭐⭐⭐ Manual setup |
⭐⭐⭐ Manual setup |
⭐⭐⭐⭐ Manual setup |
| Modular Architecture |
⭐⭐⭐⭐ High (plugins) |
⭐⭐⭐⭐⭐ Very High (modules) |
⭐⭐⭐⭐ High (dynamic modules) |
⭐⭐⭐ Moderate |
⭐⭐⭐⭐ High |
| Security Features |
⭐⭐⭐⭐⭐ Advanced (ECH, PQC) |
⭐⭐⭐⭐ Strong |
⭐⭐⭐⭐ Strong |
⭐⭐⭐ Moderate |
⭐⭐⭐⭐ Strong |
| Use Case - Small Sites |
⭐⭐⭐⭐⭐ Perfect |
⭐⭐⭐ Good |
⭐⭐⭐ Good |
⭐⭐⭐⭐ Perfect |
⭐⭐ Not ideal |
| Use Case - High Traffic |
⭐⭐⭐⭐ Good |
⭐⭐ Moderate |
⭐⭐⭐⭐⭐ Excellent |
⭐⭐⭐⭐ Good |
⭐⭐⭐⭐⭐ Excellent |
| Use Case - APIs |
⭐⭐⭐⭐ Good |
⭐⭐ Moderate |
⭐⭐⭐⭐⭐ Excellent |
⭐⭐⭐ Good |
⭐⭐⭐⭐⭐ Excellent |
| Use Case - Reverse Proxy |
⭐⭐⭐⭐⭐ Excellent |
⭐⭐⭐ Good |
⭐⭐⭐⭐⭐ Excellent |
⭐⭐⭐ Good |
⭐⭐⭐⭐⭐ Excellent |
| Development Language |
Go |
C |
C |
C |
C |
| License |
Apache-2.0 |
Apache-2.0 |
BSD-2-Clause |
BSD-2-Clause |
GPL/2 |
| Community Support |
⭐⭐⭐ Growing |
⭐⭐⭐⭐⭐ Extensive |
⭐⭐⭐⭐⭐ Extensive |
⭐⭐⭐ Moderate |
⭐⭐⭐⭐ Good |
- Caddy: Uses a simple, human-readable Caddyfile or JSON configuration. Automatic HTTPS configuration eliminates the need for complex SSL certificate management.
- Apache: Uses complex .htaccess files and httpd.conf with XML-like syntax. Rich module system but configuration can become unwieldy.
- Nginx: Uses block-based configuration with nested directives. More efficient than Apache but requires learning curve.
- Lighttpd: Minimalist configuration, focused on efficiency and simplicity.
- HAProxy: Specialized configuration for load balancing and proxying, not general web serving.
- Caddy: Efficient Go-based architecture with good performance for most use cases. HTTP/3 support gives edge in modern deployments.
- Apache: Traditional process/thread model can consume more resources under high load, though MPM options help.
- Nginx: Event-driven architecture optimized for high concurrency with low memory footprint.
- Lighttpd: Extremely lightweight, designed for speed and low resource usage.
- HAProxy: Optimized specifically for load balancing with exceptional performance in that role.
- Caddy: Leading edge with Encrypted ClientHello (ECH) and Post-Quantum Cryptography (PQC) support. Automatic security best practices.
- Apache: Mature security module ecosystem, extensive documentation on hardening.
- Nginx: Strong security posture, good SSL/TLS implementation, extensive access controls.
- Lighttpd: Secure but smaller attack surface due to minimalist design.
- HAProxy: Enterprise-grade security features for load balancing and proxying.
- Caddy: Development, small-to-medium production sites, automatic HTTPS requirements, modern web applications.
- Apache: Legacy applications, .htaccess-dependent sites, complex rewrite rules, shared hosting.
- Nginx: High-traffic sites, API gateways, microservices, reverse proxying, static file serving.
- Lighttpd: Embedded systems, small sites, performance-critical applications with limited resources.
- HAProxy: Load balancing, high-availability setups, traffic routing for complex architectures.
- Go (97.8%)
- Additional: HTML (2.2%)
- ✅ Actively maintained - Recent release (Feb 2026)
- ✅ Official Docker image -
caddy (500M+ pulls)
- 🔧 HTTP/3/QUIC support - Native implementation
- ⚠️ CRITICAL SECURITY - 6 CVEs fixed in v2.11.1 - UPGRADE NOW
- 📦 Repository available - Cloudsmith (Debian/Ubuntu), COPR (RHEL)
- 🏢 Commercial backing - Part of ZeroSSL (HID Global)
- 🔐 Leading security - ECH, PQC support since v2.10
¶ History and References
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