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Support for Multiple Domain names (instance behind reverse proxy) #2256

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05f96ef
fix csrf and domain_name when the instance is behind multiple differe…
Mar 11, 2026
d87143a
add some documentation about multiple domains
Mar 11, 2026
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5 changes: 4 additions & 1 deletion ...on/docs/Developers_and_Administrators/How-to-deploy-Codabench-on-your-server.md
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Original file line number Diff line number Diff line change
Expand Up @@ -439,4 +439,7 @@ Caddyfile :
path /{$AWS_STORAGE_BUCKET_NAME}* /{$AWS_STORAGE_PRIVATE_BUCKET_NAME}*
}
reverse_proxy @min_bucket minio:{$MINIO_PORT}
```
```

## Codabench Instance behind a reverse proxy
If you put your instance behind a reverse proxy and want that proxy to contact the instance via http or https, your `DOMAIN_NAME` might not be reachable from the outside. In this case, you can set `DOMAIN_NAME` as your internal domain name, used by the reverse proxy, and `EXTERNAL_DOMAIN_NAME` as the domain name that is known on external networks (like the internet).
18 changes: 12 additions & 6 deletions src/settings/base.py
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Expand Up @@ -19,15 +19,21 @@
csrf_https_domain = "https://" + os.environ.get("DOMAIN_NAME").split(':')[0]
csrf_http_domain = "http://" + os.environ.get("DOMAIN_NAME").split(':')[0]

CSRF_TRUSTED_ORIGINS = [csrf_https_domain, csrf_http_domain]
CSRF_ALLOWED_ORIGINS = [csrf_https_domain, csrf_http_domain]
if os.environ.get("EXTERNAL_DOMAIN_NAME", "") != "":
csrf_https_external_domain = "https://" + os.environ.get("EXTERNAL_DOMAIN_NAME", "").split(':')[0]
csrf_http_external_domain = "http://" + os.environ.get("EXTERNAL_DOMAIN_NAME", "").split(':')[0]
CSRF_TRUSTED_ORIGINS = [csrf_https_domain, csrf_http_domain, csrf_https_external_domain, csrf_http_external_domain]
CSRF_ALLOWED_ORIGINS = [csrf_https_domain, csrf_http_domain, csrf_https_external_domain, csrf_http_external_domain]

SITE_ID = 1
DOMAIN_NAME = os.environ.get('EXTERNAL_DOMAIN_NAME').split(':')[0]
else:
CSRF_TRUSTED_ORIGINS = [csrf_https_domain, csrf_http_domain]
CSRF_ALLOWED_ORIGINS = [csrf_https_domain, csrf_http_domain]

SITE_DOMAIN = os.environ.get('SITE_DOMAIN', 'http://localhost')
DOMAIN_NAME = os.environ.get('DOMAIN_NAME', 'localhost').split(':')[0]
DOMAIN_NAME = os.environ.get('DOMAIN_NAME', 'localhost').split(':')[0]

SELENIUM_HOSTNAME = os.environ.get("SELENIUM_HOSTNAME", "localhost")
SITE_DOMAIN = os.environ.get('SITE_DOMAIN', 'http://localhost')
SITE_ID = 1


THIRD_PARTY_APPS = (
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