# Handle SAML authentication request (Redirect binding)

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

Process SAML authentication request using HTTP Redirect binding.


## Servers
- Logto endpoint address.: https://[tenant_id].logto.app (Logto endpoint address.)


## Authentication methods
- O auth2


## Parameters

#### Path parameters
- **id** (string)
  The ID of the SAML application.

#### Query parameters
- **SAMLRequest** (string)
  The SAML request message.
- **Signature** (string)
  The signature of the request.
- **SigAlg** (string)
  The signature algorithm.
- **RelayState** (string)
  The relay state parameter.


## Responses
### 200: OK

### 302: Redirects to the sign-in page.

### 400: Invalid SAML request.

### 404: The SAML application was not found.


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