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wtf is caddy?

fsword/caddy — explained in plain English

Analysis updated 2026-07-18 · repo last pushed 2020-06-16

DockerfileAudience · ops devopsComplexity · 2/5DormantSetup · easy

TL;DR

A Dockerized Caddy setup that auto-generates web-server routing and free HTTPS certificates for multiple domains just from environment variables, no manual config editing needed.

Mindmap

mindmap
  root((repo))
    What it does
      Routes multi-domain traffic
      Auto HTTPS certs
      Generates config live
    Tech stack
      Docker
      Caddy
    Use cases
      Microservices routing
      Multi-app hosting
      WebSocket support
    Audience
      Ops devops

Code map

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filefunction / class

Why would anyone build with this?

REASON 1

Expose several services on different subdomains by setting one environment variable per domain, with HTTPS handled automatically.

REASON 2

Route traffic to multiple Node.js microservices from their own domains without hand-editing a Caddyfile.

REASON 3

Enable WebSocket support for a real-time chat or app service behind a domain-based route with zero extra config.

REASON 4

Spin up the container with your domain-to-service mappings as env vars and get a working HTTPS setup in one step.

What's in the stack?

DockerCaddy

How it stacks up

fsword/caddyag-grid/ag-charts-server-side-examplecaspermeijn/wallabag-test-server
LanguageDockerfileDockerfileDockerfile
Last pushed2020-06-162026-03-132024-12-24
MaintenanceDormantMaintainedStale
Setup difficultyeasymoderateeasy
Complexity2/52/52/5
Audienceops devopsdeveloperdeveloper

Figures from each repo's GitHub metadata at analysis time.

How do you spin it up?

Difficulty · easy Time to first run · 30min

Requires Docker and a valid email address for automatic HTTPS certificate issuance.

No license information was stated in the explanation.

Yoink these prompts

Prompt 1
Show me how to set environment variables so this Caddy Docker setup routes app.example.com to a service on port 3000 with HTTPS enabled.
Prompt 2
Write the docker run command and environment variables needed to expose three services (web, api, chat) on their own subdomains using this Caddy image.
Prompt 3
Explain how this project turns CADDY_* environment variables into a working Caddy configuration file with automatic TLS certificates.
Prompt 4
How do I add WebSocket support for a chat service running behind this Caddy Docker container?

Frequently asked questions

wtf is caddy?

A Dockerized Caddy setup that auto-generates web-server routing and free HTTPS certificates for multiple domains just from environment variables, no manual config editing needed.

What language is caddy written in?

Mainly Dockerfile. The stack also includes Docker, Caddy.

Is caddy actively maintained?

Dormant — no commits in 2+ years (last push 2020-06-16).

What license does caddy use?

No license information was stated in the explanation.

How hard is caddy to set up?

Setup difficulty is rated easy, with roughly 30min to a first successful run.

Who is caddy for?

Mainly ops devops.

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