# Handle SAML authentication request (POST binding)

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

Process SAML authentication request using HTTP POST 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.


## Body parameters
Content-type: application/json

- **SAMLRequest** (string)
  
- **RelayState** (string)
  

## 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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