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# Add a strategy to a feature flag

POST https://app.unleash-instance.example.com/api/admin/projects/{projectId}/features/{featureName}/environments/{environment}/strategies
Content-Type: application/json

Add a strategy to a feature flag in the specified environment.

Reference: https://docs.getunleash.io/api/add-feature-strategy

## Authentication

- `Authorization` header (required) — API key needed to access this API
- `Authorization` header (bearer token, required) — API key needed to access this API, in Bearer token format

## Request

### Path parameters

- `projectId` (string, required)
- `featureName` (string, required)
- `environment` (string, required)

### Body (application/json)

This endpoint expects a createFeatureStrategySchema.

- `name` (string, required) — The name of the strategy type
- `title` (string, optional, nullable) — A descriptive title for the strategy
- `disabled` (boolean, optional, nullable) — A toggle to disable the strategy. defaults to false. Disabled strategies are not evaluated or returned to the SDKs
- `sortOrder` (double, optional) — The order of the strategy in the list
- `constraints` (list of constraintSchema, optional) — A list of the constraints attached to the strategy. See https://docs.getunleash.io/concepts/activation-strategies#constraints
- `variants` (list of createStrategyVariantSchema, optional) — Strategy level variants
- `parameters` (map from string to string, optional) — An object containing the parameters for the strategy
- `segments` (list of double, optional) — Ids of segments to use for this strategy

## Response

### 200

featureStrategySchema

- `name` (string, required) — The name or type of strategy
- `id` (string, optional) — A uuid for the feature strategy
- `title` (string, optional, nullable) — A descriptive title for the strategy
- `disabled` (boolean, optional, nullable) — A toggle to disable the strategy. defaults to false. Disabled strategies are not evaluated or returned to the SDKs
- `featureName` (string, optional) — The name or feature the strategy is attached to
- `sortOrder` (double, optional) — The order of the strategy in the list
- `segments` (list of double, optional) — A list of segment ids attached to the strategy
- `constraints` (list of constraintSchema, optional) — A list of the constraints attached to the strategy. See https://docs.getunleash.io/concepts/activation-strategies#constraints
- `variants` (list of strategyVariantSchema, optional) — Strategy level variants
- `parameters` (map from string to string, optional) — A list of parameters for a strategy

## Errors

### 401 Unauthorized Error

Authorization information is missing or invalid. Provide a valid API token as the `authorization` header, e.g. `authorization:*.*.my-admin-token`.

- `id` (string, optional) — The ID of the error instance
- `name` (string, optional) — The name of the error kind
- `message` (string, optional) — A description of what went wrong.

### 403 Forbidden Error

The provided user credentials are valid, but the user does not have the necessary permissions to perform this operation

- `id` (string, optional) — The ID of the error instance
- `name` (string, optional) — The name of the error kind
- `message` (string, optional) — A description of what went wrong.

### 404 Not Found Error

The requested resource was not found.

- `id` (string, optional) — The ID of the error instance
- `name` (string, optional) — The name of the error kind
- `message` (string, optional) — A description of what went wrong.

## Types

### constraintSchema

A strategy constraint. For more information, refer to [the strategy constraint reference documentation](https://docs.getunleash.io/concepts/activation-strategies#constraints)

- `contextName` (string, required) — The name of the context field that this constraint should apply to.
- `operator` (enum, required) — The operator to use when evaluating this constraint. For more information about the various operators, refer to [the strategy constraint operator documentation](https://docs.getunleash.io/concepts/activation-strategies#constraint-operators).
  - Allowed values: `NOT_IN`, `IN`, `STR_ENDS_WITH`, `STR_STARTS_WITH`, `STR_CONTAINS`, `NUM_EQ`, `NUM_GT`, `NUM_GTE`, `NUM_LT`, `NUM_LTE`, `DATE_AFTER`, `DATE_BEFORE`, `SEMVER_EQ`, `SEMVER_GT`, `SEMVER_LT`, `SEMVER_GTE`, `SEMVER_LTE`, `REGEX`, `IN_CIDR`
- `caseInsensitive` (boolean, optional, default: false) — Whether the operator should be case sensitive or not. Defaults to `false` (being case sensitive).
- `inverted` (boolean, optional, default: false) — Whether the result should be negated or not. If `true`, will turn a `true` result into a `false` result and vice versa.
- `values` (list of string, optional) — The context values that should be used for constraint evaluation. Use this property instead of `value` for properties that accept multiple values.
- `value` (string, optional) — The context value that should be used for constraint evaluation. Use this property instead of `values` for properties that only accept single values.

### createStrategyVariantSchema

This is an experimental property. It may change or be removed as we work on it. Please don't depend on it yet. A strategy variant allows you to attach any data to strategies instead of only returning `true`/`false`. Strategy variants take precedence over feature variants.

- `name` (string, required) — The variant name. Must be unique for this feature flag
- `weight` (integer, required) — The weight is the likelihood of any one user getting this variant. It is an integer between 0 and 1000. See the section on [variant weights](https://docs.getunleash.io/concepts/feature-flag-variants#variant-weight) for more information
- `weightType` (enum, required) — Set to `fix` if this variant must have exactly the weight allocated to it. If the type is `variable`, the weight will adjust so that the total weight of all variants adds up to 1000. Refer to the [variant weight documentation](https://docs.getunleash.io/concepts/feature-flag-variants#variant-weight).
  - Allowed values: `variable`, `fix`
- `stickiness` (string, required) — The [stickiness](https://docs.getunleash.io/concepts/feature-flag-variants#variant-stickiness) to use for distribution of this variant. Stickiness is how Unleash guarantees that the same user gets the same variant every time
- `payload` (CreateStrategyVariantSchemaPayload, optional) — Extra data configured for this variant

### strategyVariantSchema

This is an experimental property. It may change or be removed as we work on it. Please don't depend on it yet. A strategy variant allows you to attach any data to strategies instead of only returning `true`/`false`. Strategy variants take precedence over feature variants.

- `name` (string, required) — The variant name. Must be unique for this feature flag
- `weight` (integer, required) — The weight is the likelihood of any one user getting this variant. It is an integer between 0 and 1000. See the section on [variant weights](https://docs.getunleash.io/concepts/feature-flag-variants#variant-weight) for more information
- `weightType` (enum, required) — Set to `fix` if this variant must have exactly the weight allocated to it. If the type is `variable`, the weight will adjust so that the total weight of all variants adds up to 1000. Refer to the [variant weight documentation](https://docs.getunleash.io/concepts/feature-flag-variants#variant-weight).
  - Allowed values: `variable`, `fix`
- `stickiness` (string, required) — The [stickiness](https://docs.getunleash.io/concepts/feature-flag-variants#variant-stickiness) to use for distribution of this variant. Stickiness is how Unleash guarantees that the same user gets the same variant every time
- `payload` (StrategyVariantSchemaPayload, optional) — Extra data configured for this variant

### CreateStrategyVariantSchemaPayload

Extra data configured for this variant

- `type` (enum, required) — The type of the value. Commonly used types are string, number, json and csv.
  - Allowed values: `json`, `csv`, `string`, `number`
- `value` (string, required) — The actual value of payload

### StrategyVariantSchemaPayload

Extra data configured for this variant

- `type` (enum, required) — The type of the value. Commonly used types are string, number, json and csv.
  - Allowed values: `json`, `csv`, `string`, `number`
- `value` (string, required) — The actual value of payload

## Examples

**Request**

```json
{
  "name": "flexibleRollout"
}
```

**Response**

```json
{
  "name": "flexibleRollout",
  "id": "6b5157cb-343a-41e7-bfa3-7b4ec3044840",
  "title": "Gradual Rollout 25-Prod",
  "disabled": false,
  "featureName": "myAwesomeFeature",
  "sortOrder": 9999,
  "segments": [
    1,
    2
  ],
  "constraints": [
    {
      "contextName": "appName",
      "operator": "IN",
      "caseInsensitive": false,
      "inverted": false,
      "values": [
        "my-app",
        "my-other-app"
      ],
      "value": "my-app"
    }
  ],
  "variants": [
    {
      "name": "blue_group",
      "weight": 1,
      "weightType": "fix",
      "stickiness": "custom.context.field",
      "payload": {
        "type": "json",
        "value": "{\"color\": \"red\"}"
      }
    }
  ],
  "parameters": {}
}
```

**SDK Code**

```python
import requests

url = "https://app.unleash-instance.example.com/api/admin/projects/projectId/features/featureName/environments/environment/strategies"

payload = { "name": "flexibleRollout" }
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/admin/projects/projectId/features/featureName/environments/environment/strategies';
const options = {
  method: 'POST',
  headers: {Authorization: '<apiKey>', 'Content-Type': 'application/json'},
  body: '{"name":"flexibleRollout"}'
};

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/admin/projects/projectId/features/featureName/environments/environment/strategies"

	payload := strings.NewReader("{\n  \"name\": \"flexibleRollout\"\n}")

	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/admin/projects/projectId/features/featureName/environments/environment/strategies")

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 = "{\n  \"name\": \"flexibleRollout\"\n}"

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/admin/projects/projectId/features/featureName/environments/environment/strategies")
  .header("Authorization", "<apiKey>")
  .header("Content-Type", "application/json")
  .body("{\n  \"name\": \"flexibleRollout\"\n}")
  .asString();
```

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

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://app.unleash-instance.example.com/api/admin/projects/projectId/features/featureName/environments/environment/strategies', [
  'body' => '{
  "name": "flexibleRollout"
}',
  'headers' => [
    'Authorization' => '<apiKey>',
    'Content-Type' => 'application/json',
  ],
]);

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

```csharp
using RestSharp;

var client = new RestClient("https://app.unleash-instance.example.com/api/admin/projects/projectId/features/featureName/environments/environment/strategies");
var request = new RestRequest(Method.POST);
request.AddHeader("Authorization", "<apiKey>");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{\n  \"name\": \"flexibleRollout\"\n}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

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

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

let request = NSMutableURLRequest(url: NSURL(string: "https://app.unleash-instance.example.com/api/admin/projects/projectId/features/featureName/environments/environment/strategies")! 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()
```