# 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: application/json (object)

- **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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