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Caddy is an extensible server platform that uses TLS by default.

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• Easy configuration with theCaddyfile
• Powerful configuration with itsnative JSON config
• Dynamic configuration with theJSON API
• Config adapters if you don't like JSON
• Automatic HTTPS by default
  • ZeroSSL andLet's Encrypt for public names
  • Fully-managed local CA for internal names & IPs
  • Can coordinate with other Caddy instances in a cluster
  • Multi-issuer fallback
  • Encrypted ClientHello (ECH) support
• Stays up when other servers go down due to TLS/OCSP/certificate-related issues
• Production-ready after serving trillions of requests and managing millions of TLS certificates
• Scales to hundreds of thousands of sites as proven in production
• HTTP/1.1, HTTP/2, and HTTP/3 all supported by default
• Highly extensiblemodular architecture lets Caddy do anything without bloat
• Runs anywhere withno external dependencies (not even libc)
• Written in Go, a language with highermemory safety guarantees than other servers
• Actuallyfun to use
• So much more todiscover

The simplest, cross-platform way to get started is to download Caddy fromGitHub Releases and place the executable file in your PATH.

Seeour online documentation for other install instructions.

Requirements:

• Go 1.24.0 or newer

Note: These stepswill not embed proper version information. For that, please follow the instructions in the next section.

$ git clone"https://github.com/caddyserver/caddy.git"$cd caddy/cmd/caddy/$ go build

When you run Caddy, it may try to bind to low ports unless otherwise specified in your config. If your OS requires elevated privileges for this, you will need to give your new binary permission to do so. On Linux, this can be done easily with:sudo setcap cap_net_bind_service=+ep ./caddy

If you prefer to usego run which only creates temporary binaries, you can still do this with the includedsetcap.sh like so:

$ go run -exec ./setcap.sh main.go

If you don't want to type your password forsetcap, usesudo visudo to edit your sudoers file and allow your user account to run that command without a password, for example:

username ALL=(ALL:ALL) NOPASSWD: /usr/sbin/setcap

replacingusername with your actual username. Please be careful and only do this if you know what you are doing! We are only qualified to document how to use Caddy, not Go tooling or your computer, and we are providing these instructions for convenience only; please learn how to use your own computer at your own risk and make any needful adjustments.

Usingour builder tool,xcaddy...

$ xcaddy build

...the following steps are automated:

1. Create a new folder:mkdir caddy
2. Change into it:cd caddy
3. CopyCaddy's main.go into the empty folder. Add imports for any custom plugins you want to add.
4. Initialize a Go module:go mod init caddy
5. (Optional) Pin Caddy version:go get github.com/caddyserver/caddy/v2@version replacingversion with a git tag, commit, or branch name.
6. (Optional) Add plugins by adding their import:_ "import/path/here"
7. Compile:go build -tags=nobadger,nomysql,nopgx

TheCaddy website has documentation that includes tutorials, quick-start guides, reference, and more.

We recommend that all users -- regardless of experience level -- do ourGetting Started guide to become familiar with using Caddy.

If you've only got a minute,the website has several quick-start tutorials to choose from! However, after finishing a quick-start tutorial, please read more documentation to understand how the software works. 🙂

Caddy is most often used as an HTTPS server, but it is suitable for any long-running Go program. First and foremost, it is a platform to run Go applications. Caddy "apps" are just Go programs that are implemented as Caddy modules. Two apps --tls andhttp -- ship standard with Caddy.

Caddy apps instantly benefit fromautomated documentation, graceful on-lineconfig changes via API, and unification with other Caddy apps.

AlthoughJSON is Caddy's native config language, Caddy can accept input fromconfig adapters which can essentially convert any config format of your choice into JSON: Caddyfile, JSON 5, YAML, TOML, NGINX config, and more.

The primary way to configure Caddy is throughits API, but if you prefer config files, thecommand-line interface supports those too.

Caddy exposes an unprecedented level of control compared to any web server in existence. In Caddy, you are usually setting the actual values of the initialized types in memory that power everything from your HTTP handlers and TLS handshakes to your storage medium. Caddy is also ridiculously extensible, with a powerful plugin system that makes vast improvements over other web servers.

To wield the power of this design, you need to know how the config document is structured. Please seeour documentation site for details aboutCaddy's config structure.

Nearly all of Caddy's configuration is contained in a single config document, rather than being scattered across CLI flags and env variables and a configuration file as with other web servers. This makes managing your server config more straightforward and reduces hidden variables/factors.

Our website has complete documentation:

https://caddyserver.com/docs/

The docs are also open source. You can contribute to them here:https://github.com/caddyserver/website

• We advise companies using Caddy to secure a support contract throughArdan Labs before help is needed.

• Asponsorship goes a long way! We can offer private help to sponsors. If Caddy is benefitting your company, please consider a sponsorship. This not only helps fund full-time work to ensure the longevity of the project, it provides your company the resources, support, and discounts you need; along with being a great look for your company to your customers and potential customers!

• Individuals can exchange help for free on our community forum athttps://caddy.community. Remember that people give help out of their spare time and good will. The best way to get help is to give it first!

Please use ourissue tracker only for bug reports and feature requests, i.e. actionable development items (support questions will usually be referred to the forums).

Matthew Holt began developing Caddy in 2014 while studying computer science at Brigham Young University. (The name "Caddy" was chosen because this software helps with the tedious, mundane tasks of serving the Web, and is also a single place for multiple things to be organized together.) It soon became the first web server to use HTTPS automatically and by default, and now has hundreds of contributors and has served trillions of HTTPS requests.

The name "Caddy" is trademarked. The name of the software is "Caddy", not "Caddy Server" or "CaddyServer". Please call it "Caddy" or, if you wish to clarify, "the Caddy web server". Caddy is a registered trademark of Stack Holdings GmbH.

• Project on X:@caddyserver
• Author on X:@mholt6

Caddy is a project ofZeroSSL, a Stack Holdings company.

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