# `AttestoPhoenix.BackChannelLogout.Req`
[🔗](https://github.com/XukuLLC/attesto_phoenix/blob/v0.19.0/lib/attesto_phoenix/back_channel_logout/req.ex#L1)

Default `AttestoPhoenix.BackChannelLogout` deliverer, built on `Req`.

POSTs the `logout_token` to the Relying Party's `backchannel_logout_uri` as
`application/x-www-form-urlencoded` (OpenID Connect Back-Channel Logout 1.0
§2.5). Redirects and retries are disabled and the timeout is short: logout
delivery is best-effort and must not let a slow or hostile RP stall the
end-session response. A 2xx is success; anything else (non-2xx, transport
error) is reported so the caller can log it.

`Req` is an optional dependency. A host that enables Back-Channel Logout with
the default deliverer must have `:req` available; one that supplies its own
`logout: [http_client: ...]` does not.

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*Consult [api-reference.md](api-reference.md) for complete listing*