Fast, multi-platform web server with automatic HTTPS
Caddy is an extensible server platform that uses TLS by default.
The simplest, cross-platform way is to download from GitHub Releases and place the executable file in your PATH.
For other install options, see https://caddyserver.com/docs/download.
Note: These steps will 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, 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 runwhich creates temporary binaries, you can still do this. Make an executable file called
setcap.sh(or whatever you want) with these contents:
#!/bin/sh sudo setcap cap_net_bind_service=+ep "$1" "[email protected]"
then you can use
go runlike so:
$ go run -exec ./setcap.sh main.go
If you don't want to type your password for
sudo visudoto 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
usernamewith 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.
Using our builder tool,
$ xcaddy build
...the following steps are automated:
go mod init caddy
go get github.com/caddyserver/caddy/[email protected]replacing
versionwith a git tag or commit.
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 --
http-- ship standard with Caddy.
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.
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.
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:
The docs are also open source. You can contribute to them here: https://github.com/caddyserver/website
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!
Individuals can exchange help for free on our community forum at https://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 our issue tracker only for bug reports and feature requests, i.e. actionable development items (support questions will usually be referred to the forums).
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 apilayer GmbH.