# Retrieve enabled feature flags for the provided context, using POST.

POST https://app.unleash-instance.example.com/api/frontend
Content-Type: application/json

This endpoint returns the list of feature flags that the frontend API evaluates to enabled for the given context, using POST. Context values are provided as a `context` property in the request body. If the Frontend API is disabled 404 is returned.

Reference: https://docs.getunleash.io/api/get-frontend-api-features-with-post

## OpenAPI Specification

```yaml
openapi: 3.1.1
info:
  title: Retrieve enabled feature flags for the provided context, using POST.
  version: endpoint_frontendApi.getFrontendApiFeaturesWithPost
paths:
  /api/frontend:
    post:
      operationId: get-frontend-api-features-with-post
      summary: Retrieve enabled feature flags for the provided context, using POST.
      description: >-
        This endpoint returns the list of feature flags that the frontend API
        evaluates to enabled for the given context, using POST. Context values
        are provided as a `context` property in the request body. If the
        Frontend API is disabled 404 is returned.
      tags:
        - - subpackage_frontendApi
      parameters:
        - name: Authorization
          in: header
          description: Header authentication of the form `undefined <token>`
          required: true
          schema:
            type: string
      responses:
        '200':
          description: frontendApiFeaturesSchema
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/frontendApiFeaturesSchema'
        '401':
          description: >-
            Authorization information is missing or invalid. Provide a valid API
            token as the `authorization` header, e.g.
            `authorization:*.*.my-admin-token`.
          content: {}
        '404':
          description: The requested resource was not found.
          content: {}
      requestBody:
        description: frontendApiFeaturesPostSchema
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/frontendApiFeaturesPostSchema'
components:
  schemas:
    FrontendApiFeaturesPostSchemaContext:
      type: object
      properties:
        appName:
          type: string
          description: The name of the application.
        currentTime:
          type: string
          format: date-time
          description: >-
            A DateTime (or similar) data class instance or a string in an
            RFC3339-compatible format. Defaults to the current time if not set
            by the user.
        environment:
          type: string
          description: The environment the app is running in.
        properties:
          type: object
          additionalProperties:
            type: string
          description: Additional Unleash context properties
        remoteAddress:
          type: string
          description: The app's IP address
        sessionId:
          type: string
          description: An identifier for the current session
        userId:
          type: string
          description: An identifier for the current user
    frontendApiFeaturesPostSchema:
      type: object
      properties:
        context:
          $ref: '#/components/schemas/FrontendApiFeaturesPostSchemaContext'
          description: The Unleash context.
    FrontendApiFeatureSchemaVariantPayloadType:
      type: string
      enum:
        - value: json
        - value: csv
        - value: string
        - value: number
    FrontendApiFeatureSchemaVariantPayload:
      type: object
      properties:
        type:
          $ref: '#/components/schemas/FrontendApiFeatureSchemaVariantPayloadType'
          description: The format of the payload.
        value:
          type: string
          description: The payload value stringified.
      required:
        - type
        - value
    FrontendApiFeatureSchemaVariant:
      type: object
      properties:
        name:
          type: string
          description: The variants name. Is unique for this feature flag
        enabled:
          type: boolean
          description: Whether the variant is enabled or not.
        payload:
          $ref: '#/components/schemas/FrontendApiFeatureSchemaVariantPayload'
          description: Extra data configured for this variant
        feature_enabled:
          type: boolean
          description: Whether the feature is enabled or not.
        featureEnabled:
          type: boolean
          description: Use `feature_enabled` instead.
      required:
        - name
        - enabled
    frontendApiFeatureSchema:
      type: object
      properties:
        name:
          type: string
          description: Unique feature name.
        enabled:
          type: boolean
          description: Always set to `true`.
        impressionData:
          type: boolean
          description: >-
            `true` if the impression data collection is enabled for the feature,
            otherwise `false`.
        variant:
          $ref: '#/components/schemas/FrontendApiFeatureSchemaVariant'
          description: Variant details
      required:
        - name
        - enabled
        - impressionData
    frontendApiFeaturesSchema:
      type: object
      properties:
        toggles:
          type: array
          items:
            $ref: '#/components/schemas/frontendApiFeatureSchema'
          description: The actual features returned to the Frontend SDK
      required:
        - toggles

```

## SDK Code Examples

```python
import requests

url = "https://app.unleash-instance.example.com/api/frontend"

payload = {}
headers = {
    "Authorization": "<apiKey>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.json())
```

```javascript
const url = 'https://app.unleash-instance.example.com/api/frontend';
const options = {
  method: 'POST',
  headers: {Authorization: '<apiKey>', 'Content-Type': 'application/json'},
  body: '{}'
};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}
```

```go
package main

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

func main() {

	url := "https://app.unleash-instance.example.com/api/frontend"

	payload := strings.NewReader("{}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "<apiKey>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
```

```ruby
require 'uri'
require 'net/http'

url = URI("https://app.unleash-instance.example.com/api/frontend")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = '<apiKey>'
request["Content-Type"] = 'application/json'
request.body = "{}"

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

```java
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.post("https://app.unleash-instance.example.com/api/frontend")
  .header("Authorization", "<apiKey>")
  .header("Content-Type", "application/json")
  .body("{}")
  .asString();
```

```php
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://app.unleash-instance.example.com/api/frontend', [
  'body' => '{}',
  'headers' => [
    'Authorization' => '<apiKey>',
    'Content-Type' => 'application/json',
  ],
]);

echo $response->getBody();
```

```csharp
using RestSharp;

var client = new RestClient("https://app.unleash-instance.example.com/api/frontend");
var request = new RestRequest(Method.POST);
request.AddHeader("Authorization", "<apiKey>");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = [
  "Authorization": "<apiKey>",
  "Content-Type": "application/json"
]
let parameters = [] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://app.unleash-instance.example.com/api/frontend")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```