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# Proxy configuration
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Configuring Baby Buddy to run behind a proxy may require some additional configuration
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depending on the individual proxy configuration. Baby Buddy's environment variables for
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configuration should allow most proxy setups to work, but it may require some testing
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and tweaking of settings.
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## Important configuration
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### [`CSRF_TRUSTED_ORIGINS`](../configuration#csrf_trusted_origins)
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[Cross Site Request Forgery](https://owasp.org/www-community/attacks/csrf) protection is
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an important way to prevent malicious users from sending fake requests to Baby Buddy to
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read, alter, or destroy data.
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To protect against this threat Baby Buddy checks the `Origin` header of certain requests
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to ensure that it matches a "trusted" origin for the application. If the origin and host
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are the same CSRF will pass without any extra configuration but if the two are different
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the origin must be in `CSRF_TRUSTED_ORIGINS` to pass.
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For example if Baby Buddy is configured in a container with a private network and a host
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`babybuddy` that is exposed publicly by a proxy (e.g., nginx) at the address
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`https://baby.example.com` then form submissions from browsers will have an `Origin` of
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`https://baby.example.com` that *does not match* the host `babybudy`. This will cause a
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CSRF error and the request will be rejected with a `403 Forbidden` error. To support
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this example configuration the environment variable `CSRF_TRUSTED_ORIGINS` should be set
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to the full public address (including the scheme): `https://baby.example.com` for CSRF
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protected requests to succeed.
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Note: multiple origins can be added by separating origins with commas. E.g.:
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```shell
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CSRF_TRUSTED_ORIGINS=https://baby.example.com,https://baby.example.org
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```
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### [`SECURE_PROXY_SSL_HEADER`](../configuration#secure_proxy_ssl_header)
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If Baby Buddy is configured behind a standard HTTP proxy requests will always been seen
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as insecure even if the exposed public connection uses HTTPS between the client and
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proxy.
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To address this most proxies can be configured to pass a special header to Baby Buddy
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indicating the scheme used by the original request. [`X-Forwarded-Proto`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-Proto)
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is a common standard header for this feature and it is currently the only header
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supported by Baby Buddy. To use this feature the `SECURE_PROXY_SSL_HEADER` environment
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variable to `True` and Baby Buddy will consider the scheme indicated by the
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`X-Forwarded-Proto` header to be the scheme used for the request.
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**Additional Resources**
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- [Caddy Reverse Proxy Defaults](https://caddyserver.com/docs/caddyfile/directives/reverse_proxy#defaults)
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- [NGINX - Using the `Forwarded` Header](https://www.nginx.com/resources/wiki/start/topics/examples/forwarded/)
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(Note: NGINX treats `X-Forwarded-Proto` as legacy. See the bottom of this resource for relevant information.)
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- [Redirect HTTP to HTTPS with HAProxy](https://www.haproxy.com/blog/redirect-http-to-https-with-haproxy/)
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- [Traefik Routing - EntryPoints - Forwarded Headers](https://doc.traefik.io/traefik/v2.3/routing/entrypoints/#forwarded-headers)
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