---
title: "Handle SAML authentication request (Redirect binding)"
method: GET
path: "/api/saml/{id}/authn"
tags: ["SAML applications auth flow"]
---

# Handle SAML authentication request (Redirect binding)

`GET /api/saml/{id}/authn`

Process SAML authentication request using HTTP Redirect binding.

## Path parameters

- `id` string, required

## Query parameters

- `SAMLRequest` string, required
- `Signature` string
- `SigAlg` string
- `RelayState` string, nullable

## Response `200`

OK

## Other responses

- `302` — Redirects to the sign-in page.
- `400` — Invalid SAML request.
- `404` — The SAML application was not found.

---

[API](https://skmtc.net/logto/apis/logto-api-references.md) · [All operations](https://skmtc.net/logto/apis/logto-api-references/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/logto/logto-api-references/revisions/a163dc77d842/schema)