bad gateway when i use git plugin behind traefik

Hello,

I can't solve how to use the plugin behind traefik, i get a **bad gateway** error.

## First container, my docker-compose file:
```
version: '2'
#
# [ server stack ]
#
services:
web:
image: abiosoft/caddy:php
container_name: domaine.com
restart: unless-stopped
networks:
- config_traefik_network
ports:
- 2016:80
volumes:
# app
- ./localhost:/srv
# configs
- ./config/Caddyfile:/etc/Caddyfile
labels:
- "traefik.frontend.rule=Host:domaine.com"
- "traefik.port=2016"
- "traefik.backend=domaine.com"
- "traefik.frontend.entryPoints=http,https"
- "traefik.enable=true"
- "traefik.docker.network=config_traefik_network"
#
# [ networks definition ]
#
networks:
config_traefik_network:
external: true
```

**This caddyfile works well**:
```
0.0.0.0:2016
fastcgi / 127.0.0.1:9000 php # php variant only
startup php-fpm7 # php variant only
browse
gzip
log stdout
errors stderr
```

**This caddyfile doesn't work** (Bad gateway):
```
0.0.0.0:2016
fastcgi / 127.0.0.1:9000 php # php variant only
startup php-fpm7 # php variant only
browse
gzip
log stdout
errors stderr
git github.com/user/depot . {
hook /_webhook secret-key
}
```

## Second container, my docker-compose file:
```
version: '2'
#
# [ server stack ]
#
services:
web:
image: abiosoft/caddy
container_name: domain2.com
restart: unless-stopped
networks:
- config_traefik_network
ports:
- 2015:80
volumes:
# app
- ./localhost:/srv
# configs
- ./config/Caddyfile:/etc/Caddyfile
labels:
- "traefik.frontend.rule=Host:domain2.com"
- "traefik.port=2015"
- "traefik.backend=domain2.com"
- "traefik.frontend.entryPoints=http,https"
- "traefik.enable=true"
- "traefik.docker.network=config_traefik_network"
#
# [ networks definition ]
#
networks:
config_traefik_network:
external: true
```

**This caddyfile works well**:
```
0.0.0.0:2015
browse
gzip
log stdout
errors stderr
git github.com/user/depot2 . {
hook /_webhook secret-key
}
```

As far as i understand, the problem is due to php in the caddy container?
All advice are appreciate.

Thank you in advance