---
title: "External-SSO failure landing — clears state and redirects to SPA login"
method: GET
path: "/auth/idp/fail"
tags: ["Auth"]
---

# External-SSO failure landing — clears state and redirects to SPA login

`GET /auth/idp/fail`

## Request

- Base URL: `https://api.mnemom.ai/v1`
- URL: `https://api.mnemom.ai/v1/auth/idp/fail`
- Auth: none required

MNE-1449 re-flip. The idpIntent `failureUrl`: the external IdP / Zitadel signaled a failure. No session is minted; clears the `mnemom_idp_initiator` cookie and 302-redirects to the SPA login with an error flag. Returns 503 unless the cell is configured for Zitadel login.

## Other responses

- `302`: Redirects to the SPA login with an error flag. Clears `mnemom_idp_initiator`.
- `429`: Rate-limit exceeded. The global per-IP limiter (100 requests/minute, applied to every `/v1/*` route) rejected this request. Back off until the window resets — `Retry-After` carries the cooldown in seconds and `X-RateLimit-Reset` the absolute reset time.
- `500`: Server error — request was well-formed but the server failed to fulfill it. Typically a downstream dependency (DB / RPC / external API) returned an unexpected error.
- `503`: An upstream dependency is currently unavailable. The request was not processed; retry after the cooldown window.

---

[API](https://skmtc.dev/mnemom/apis/mnemom-api.md) · [All operations](https://skmtc.dev/mnemom/apis/mnemom-api/llms.txt) · [OpenAPI document](https://skmtc.dev/mnemom/apis/mnemom-api/revisions/274b7a6ea182?raw)