---
title: Service Provider Initiated Inbound SSO
description: The GET /{{envID}}/saml20/sp/sso operation initiates the SAML single sign-on action at the external identity provider. In the request URL, the idpId parameter specifies the external identity provider's ID, and the flowId parameter specifies the PingOne flow ID.
component: pingone-api
page_id: pingone-api:auth:saml-2.0/service-provider-initiated-inbound-sso
canonical_url: https://developer.pingidentity.com/pingone-api/auth/saml-2.0/service-provider-initiated-inbound-sso.html
section_ids:
  example-request: Example Request
---

# Service Provider Initiated Inbound SSO

##

```none
GET {{authPath}}/{{envID}}/saml20/sp/sso?idpId={{extIdpID}}&flowId={{flowID}}
```

The `GET /{{envID}}/saml20/sp/sso` operation initiates the SAML single sign-on action at the external identity provider. In the request URL, the `idpId` parameter specifies the external identity provider's ID, and the `flowId` parameter specifies the PingOne flow ID.

|   |                                                                                                                                                                                                                                                                                                                                                                                                 |
| - | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
|   | When a login hint is specified, the value should be included on the SAML authorization request as the `subject` element. When the OIDC equivalent of `acr_values` are specified, the values should be included on the SAML authorization request as `AuthnContextClassRef` elements. The authentication context references list, if more than one value is specified, are separated by a space. |

> **Collapse: Query parameters**
>
> | Parameter | Description                      |
> | --------- | -------------------------------- |
> | `flowId`  | The ID of the specified flow.    |
> | `idpId`   | The ID of the identity provider. |

##

### Example Request

* cURL

* C#

* Go

* HTTP

* Java

* jQuery

* NodeJS

* Python

* PHP

* Ruby

* Swift

```shell
curl --location --globoff '{{authPath}}/{{envID}}/saml20/sp/sso?idpId={{extIdpID}}&flowId={{flowID}}'
```

```csharp
var options = new RestClientOptions("{{authPath}}/{{envID}}/saml20/sp/sso?idpId={{extIdpID}}&flowId={{flowID}}")
{
  MaxTimeout = -1,
};
var client = new RestClient(options);
var request = new RestRequest("", Method.Get);
RestResponse response = await client.ExecuteAsync(request);
Console.WriteLine(response.Content);
```

```golang
package main

import (
  "fmt"
  "net/http"
  "io"
)

func main() {

  url := "{{authPath}}/{{envID}}/saml20/sp/sso?idpId={{extIdpID}}&flowId={{flowID}}"
  method := "GET"

  client := &http.Client {
  }
  req, err := http.NewRequest(method, url, nil)

  if err != nil {
    fmt.Println(err)
    return
  }
  res, err := client.Do(req)
  if err != nil {
    fmt.Println(err)
    return
  }
  defer res.Body.Close()

  body, err := io.ReadAll(res.Body)
  if err != nil {
    fmt.Println(err)
    return
  }
  fmt.Println(string(body))
}
```

```http
GET /{{envID}}/saml20/sp/sso?idpId={{extIdpID}}&flowId={{flowID}} HTTP/1.1
Host: {{authPath}}
```

```java
OkHttpClient client = new OkHttpClient().newBuilder()
  .build();
MediaType mediaType = MediaType.parse("text/plain");
RequestBody body = RequestBody.create(mediaType, "");
Request request = new Request.Builder()
  .url("{{authPath}}/{{envID}}/saml20/sp/sso?idpId={{extIdpID}}&flowId={{flowID}}")
  .method("GET", body)
  .build();
Response response = client.newCall(request).execute();
```

```javascript
var settings = {
  "url": "{{authPath}}/{{envID}}/saml20/sp/sso?idpId={{extIdpID}}&flowId={{flowID}}",
  "method": "GET",
  "timeout": 0,
};

$.ajax(settings).done(function (response) {
  console.log(response);
});
```

```javascript
var request = require('request');
var options = {
  'method': 'GET',
  'url': '{{authPath}}/{{envID}}/saml20/sp/sso?idpId={{extIdpID}}&flowId={{flowID}}',
  'headers': {
  }
};
request(options, function (error, response) {
  if (error) throw new Error(error);
  console.log(response.body);
});
```

```python
import requests

url = "{{authPath}}/{{envID}}/saml20/sp/sso?idpId={{extIdpID}}&flowId={{flowID}}"

payload = {}
headers = {}

response = requests.request("GET", url, headers=headers, data=payload)

print(response.text)
```

```php
<?php
require_once 'HTTP/Request2.php';
$request = new HTTP_Request2();
$request->setUrl('{{authPath}}/{{envID}}/saml20/sp/sso?idpId={{extIdpID}}&flowId={{flowID}}');
$request->setMethod(HTTP_Request2::METHOD_GET);
$request->setConfig(array(
  'follow_redirects' => TRUE
));
try {
  $response = $request->send();
  if ($response->getStatus() == 200) {
    echo $response->getBody();
  }
  else {
    echo 'Unexpected HTTP status: ' . $response->getStatus() . ' ' .
    $response->getReasonPhrase();
  }
}
catch(HTTP_Request2_Exception $e) {
  echo 'Error: ' . $e->getMessage();
}
```

```ruby
require "uri"
require "net/http"

url = URI("{{authPath}}/{{envID}}/saml20/sp/sso?idpId={{extIdpID}}&flowId={{flowID}}")

http = Net::HTTP.new(url.host, url.port);
request = Net::HTTP::Get.new(url)

response = http.request(request)
puts response.read_body
```

```swift
var request = URLRequest(url: URL(string: "{{authPath}}/{{envID}}/saml20/sp/sso?idpId={{extIdpID}}&flowId={{flowID}}")!,timeoutInterval: Double.infinity)
request.httpMethod = "GET"

let task = URLSession.shared.dataTask(with: request) { data, response, error in
  guard let data = data else {
    print(String(describing: error))
    return
  }
  print(String(data: data, encoding: .utf8)!)
}

task.resume()
```