fork of 🔒 because I wanted simpler TLS on the admin API listener
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forest 9fd013f8b5 add docker-based build to build 2 years ago
.github change go package path for fork 2 years ago
caddyconfig replace complex default admin endpoint security w/ simple mTLS 2 years ago
caddytest change go package path for fork 2 years ago
cmd add proxyprotocol module 2 years ago
modules prevent http->https redirection to port 0 2 years ago
notify notify: Send all sd_notify signals from main caddy process (#4060) 3 years ago
.gitignore add picopublish build script for the greenhouse installer 2 years ago
.golangci.yml Move from deprecated ioutil to os and io packages (#4364) 3 years ago
.goreleaser.yml change go package path for fork 2 years ago
AUTHORS Add authors file 5 years ago
LICENSE Add license 5 years ago change go package path for fork 2 years ago
admin.go remove unused functions related to the admin endpoint host filtering 2 years ago
admin_test.go admin: Sync server variables (fix #4260) (#4274) 3 years ago
caddy.go replace complex default admin endpoint security w/ simple mTLS 2 years ago
caddy_test.go core: Add support for `d` duration unit (#3323) 4 years ago
context.go caddytls: Implement remote IP connection matcher (#4123) 3 years ago
context_test.go core: Add godoc examples for LoadModule 5 years ago
duration_fuzz.go ci: fuzz: add 4 more fuzzing targets (#4105) 3 years ago
go.mod add proxy protocol module to go.mod 2 years ago
go.sum add proxy protocol module to go.mod 2 years ago
listeners.go make sure to remove unix socket file on close & before listening again 2 years ago
listeners_fuzz.go ci: fuzz: switch engine from libfuzzer to native go-fuzz (#3194) 4 years ago
listeners_test.go admin: Always enforce Host header checks 4 years ago
logging.go Move from deprecated ioutil to os and io packages (#4364) 3 years ago
metrics.go metrics: use buildinfo collector from new collectors pkg (#4187) 3 years ago
modules.go doc: Improve comment 4 years ago
modules_test.go Couple of minor fixes, update readme 4 years ago add docker-based build to build 2 years ago
picopublish.Dockerfile add docker-based build to build 2 years ago add docker-based build to build 2 years ago
replacer.go core: Unix ns and Unix ms time placeholders (#4280) 3 years ago
replacer_fuzz.go ci: fuzz: switch engine from libfuzzer to native go-fuzz (#3194) 4 years ago
replacer_test.go Keep type information with placeholders until replacements happen 4 years ago
sigtrap.go admin: Identity management, remote admin, config loaders (#3994) 3 years ago
sigtrap_nonposix.go Standardize exit codes and improve shutdown handling; update gitignore 5 years ago
sigtrap_posix.go sigtrap_posix: add missing comma to SIGTERM info (#4078) 3 years ago
storage.go pki: Add trust subcommand to install root cert (closes #3204) 4 years ago
usagepool.go core: Simplify shared listeners, fix deadline bug 2 years ago


a project

Every site on HTTPS

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

@caddyserver on Twitter Caddy Forum
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Releases · Documentation · Get Help


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  • Easy configuration with the Caddyfile
  • Powerful configuration with its native JSON config
  • Dynamic configuration with the JSON API
  • Config adapters if you don't like JSON
  • Automatic HTTPS by default
    • ZeroSSL and Let'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
  • 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 tens of thousands of sites ... and probably more
  • HTTP/1.1, HTTP/2, and experimental HTTP/3 support
  • Highly extensible modular architecture lets Caddy do anything without bloat
  • Runs anywhere with no external dependencies (not even libc)
  • Written in Go, a language with higher memory safety guarantees than other servers
  • Actually fun to use
  • So, so much more to discover


The simplest, cross-platform way is to download from GitHub Releases and place the executable file in your PATH.

For other install options, see

Build from source


For development

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

$ git clone ""
$ 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 use go run which only creates temporary binaries, you can still do this with the included like so:

$ go run -exec ./ main.go

If you don't want to type your password for setcap, use sudo 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

replacing username 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.

With version information and/or plugins

Using our builder tool, xcaddy...

$ xcaddy build

...the following steps are automated:

  1. Create a new folder: mkdir caddy
  2. Change into it: cd caddy
  3. Copy Caddy'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 replacing version with a git tag, commit, or branch name.
  6. (Optional) Add plugins by adding their import: _ "import/path/here"
  7. Compile: go build

Quick start

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

We recommend that all users -- regardless of experience level -- do our Getting 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 and http -- ship standard with Caddy.

Caddy apps instantly benefit from automated documentation, graceful on-line config changes via API, and unification with other Caddy apps.

Although JSON is Caddy's native config language, Caddy can accept input from config 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 through its API, but if you prefer config files, the command-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 see our documentation site for details about Caddy'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.

Full documentation

Our website has complete documentation:

The docs are also open source. You can contribute to them here:

Getting help

  • We strongly recommend that all professionals or companies using Caddy get a support contract through Ardan Labs before help is needed.

  • A sponsorship goes a long way! 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's also a great look for your company to your customers and potential customers!

  • Individuals can exchange help for free on our community forum at 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 our issue 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.

Caddy is a project of ZeroSSL, a Stack Holdings company.

Debian package repository hosting is graciously provided by Cloudsmith. Cloudsmith is the only fully hosted, cloud-native, universal package management solution, that enables your organization to create, store and share packages in any format, to any place, with total confidence.