azurerm_application_gateway configure backend_http_settings hostname

[test-in-prod]

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Description

Azure supports configuring backend HTTP setting rule to specify a Host Name (host header) when proxying requests. Right now terraform doesn't seem to have support for this in backend_http_settings.

New or Affected Resource(s)

• azurerm_application_gateway

Potential Terraform Configuration

...

backend_http_settings {
    name                  = "${azurerm_virtual_network.vnet.name}-be-htst"
    cookie_based_affinity = "Disabled"
    port                  = 80
    protocol              = "Http"
    request_timeout       = 1
    host_name        = "backend-host.azurewebsites.net" # Host Name textbox
}

...

Now, I wonder if emulating the checkbox to pick from backend address, terraform could look into fqdn list of backend_address_pool respective via request_routing_rule.

---

Custom Host specified

Using backend address

[test-in-prod]

I guess a temporary workaround could be running a null_resource provisioner that calls:

az network application-gateway http-settings update -g <rg name> --gateway-name <apg name> -n <http setting name> --host-name-from-backend-pool true

But this is not ideal since null_resource only runs when parent resource gets created.

[tombuildsstuff]

hi @CryptonZylog

Thanks for opening this issue :)

Support for this has previously been requested in #1875 - rather than having multiple issues open tracking the same thing I'm going to close this issue in favour of #1875 - please subscribe to that issue for updates.

Thanks!

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. If you feel I made an error 🤖 🙉 , please reach out to my human friends 👉 [email protected]. Thanks!