Update backend_tls.md
add example snippet
@@ -19,6 +19,21 @@ However, this `tls` block allows a more specific pool configuration per backend
Additionally the `client_certificate`(or `client_certificate_file`) and `client_private_key` (or `client_private_key_file`)
attributes allow the backend to present certificate and key during a TLS handshake to an origin which requires them due to an mTLS setup.
+#### Example
+
+```hcl
+backend "secured" {
+ origin = "https://localhost"
+
+ tls {
+ server_ca_certificate_file = "rootCA.crt"
+ # optional
+ client_certificate_file = "client.crt"
+ client_private_key_file = "client.key"
+ }
+ }
+```
+
::attributes
---
values: [
