1. The problem I’m having:
Hi!
When the following configuration is set in Caddy Server:
:8080 {
respond "Hello, world from 8080!"
}
:9090 {
respond "Hello, world from 9090!"
}
{
"apps":{
"http":{
"servers":{
"srv0":{
"listen":[
":8080"
],
"routes":[
{
"handle":[
{
"body":"Hello, world from 8080!",
"handler":"static_response"
}
]
}
]
},
"srv1":{
"listen":[
":9090"
],
"routes":[
{
"handle":[
{
"body":"Hello, world from 9090!",
"handler":"static_response"
}
]
}
]
}
}
}
}
}
Making calls to those ports will produce these results:
~ ❯ curl http://localhost:8080
Hello, world from 8080!
~ ❯ curl http://localhost:9090
Hello, world from 9090!
The curious part is when I make a call to port 80, Caddy’s default HTTP port. The response is as below:
~ ❯ curl localhost:80
Hello, world from 8080!
Caddy responds with the same content as the one defined in the block corresponding to port :8080. About this behavior, I have several questions.
- Why does Caddy behave this way?
- Looking at the configuration in
JSON, it can be seen that the configuration of port:8080is the first one, the one corresponding tosrv0. Does this mean that Caddy, by default, unless there is an explicit configuration for port:80(HTTPport), is going to serve on port:80the first configuration that is defined in theCaddyfile, that is, thesrv0? - If I want to prevent this from happening and block those responses from port
:80, how could I do it? This applies to more complete configurations as well. The case that someone tries to access Caddy through port:80using the server’s IP comes to mind. Could that be blocked?
Thank you very much.
2. Error messages and/or full log output:
N/A
3. Caddy version:
v2.8.4 running in docker container
4. How I installed and ran Caddy:
Using docker with the following image:
caddy:latest
a. System environment:
- OS:
Ubuntu 24.04 - Docker Version: `Docker version 27.3.1, build ce12230``
b. Command:
docker compose up
c. docker-compose.yml:
services:
caddy:
image: caddy:latest
container_name: caddy
ports:
- 80:80
- 8080:8080
- 9090:9090
volumes:
- ./Caddyfile:/etc/caddy/Caddyfile
d. Caddyfile:
:8080 {
respond "Hello, world from 8080!"
}
:9090 {
respond "Hello, world from 9090!"
}
5. Links to relevant resources:
N/A