caddy-http-router

A Caddy module that routes requests by looking up upstream addresses via HTTP.

Usage

Build Caddy with this module:

xcaddy build --with github.com/AnswerDotAI/caddy-http-router

Configuration

The module extracts the subdomain from incoming requests and calls your lookup service. Your service should return plain text host:port or 404 if not found.

JSON Config

{
  "handler": "http_router",
  "lookup_url": "http://localhost:5002/lookup"
}

Then use with reverse_proxy:

{
  "handler": "reverse_proxy",
  "upstreams": [{"dial": "{http.vars.backend_upstream}"}]
}

Caddyfile

http_router {
    lookup_url http://localhost:5002/lookup
    timeout 1000
}
reverse_proxy {http.vars.backend_upstream}

Options

Option	Default	Description
lookup_url	(required)	URL of the lookup service (subdomain appended)
timeout	1000	HTTP timeout in milliseconds