curl --request PUT \
  --url https://app.launchdarkly.com/api/v2/projects/{projectKey}/flags/{flagKey}/release \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "releasePipelineKey": "<string>",
  "releaseVariationId": "<string>"
}
'

import requests

url = "https://app.launchdarkly.com/api/v2/projects/{projectKey}/flags/{flagKey}/release"

payload = {
    "releasePipelineKey": "<string>",
    "releaseVariationId": "<string>"
}
headers = {
    "Authorization": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'PUT',
  headers: {Authorization: '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({releasePipelineKey: '<string>', releaseVariationId: '<string>'})
};

fetch('https://app.launchdarkly.com/api/v2/projects/{projectKey}/flags/{flagKey}/release', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://app.launchdarkly.com/api/v2/projects/{projectKey}/flags/{flagKey}/release",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PUT",
  CURLOPT_POSTFIELDS => json_encode([
    'releasePipelineKey' => '<string>',
    'releaseVariationId' => '<string>'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: <api-key>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

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

func main() {

	url := "https://app.launchdarkly.com/api/v2/projects/{projectKey}/flags/{flagKey}/release"

	payload := strings.NewReader("{\n  \"releasePipelineKey\": \"<string>\",\n  \"releaseVariationId\": \"<string>\"\n}")

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

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

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

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

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.put("https://app.launchdarkly.com/api/v2/projects/{projectKey}/flags/{flagKey}/release")
  .header("Authorization", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"releasePipelineKey\": \"<string>\",\n  \"releaseVariationId\": \"<string>\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://app.launchdarkly.com/api/v2/projects/{projectKey}/flags/{flagKey}/release")

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

request = Net::HTTP::Put.new(url)
request["Authorization"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"releasePipelineKey\": \"<string>\",\n  \"releaseVariationId\": \"<string>\"\n}"

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

{
  "name": "Example release pipeline",
  "releasePipelineKey": "example-release-pipeline",
  "releasePipelineDescription": "Our release pipeline for typical testing and deployment",
  "phases": [
    {
      "_id": "1234a56b7c89d012345e678f",
      "_name": "Phase 1 - Testing",
      "complete": true,
      "_creationDate": "1684262711507",
      "_audiences": [
        {
          "_id": "1234a56b7c89d012345e678g",
          "name": "Phase 1 - Testing",
          "_links": {},
          "environment": {
            "_links": {
              "self": {
                "href": "/api/v2/projects/my-project/environments/my-environment",
                "type": "application/json"
              }
            },
            "key": "environment-key-123abc",
            "name": "My Environment",
            "color": "F5A623"
          },
          "configuration": {
            "releaseStrategy": "monitoredRelease",
            "requireApproval": true,
            "notifyMemberIds": [
              "1234a56b7c89d012345e678f"
            ],
            "notifyTeamKeys": [
              "example-reviewer-team"
            ],
            "releaseGuardianConfiguration": {
              "monitoringWindowMilliseconds": 60000,
              "rolloutWeight": 50,
              "rollbackOnRegression": true,
              "randomizationUnit": "user"
            }
          },
          "segmentKeys": [
            "segment-key-123abc"
          ],
          "status": "active",
          "_ruleIds": [
            "<string>"
          ]
        }
      ],
      "_completionDate": "1684262711509",
      "_completedBy": {
        "member": {
          "_links": {
            "self": {
              "href": "/api/v2/members/569f183514f4432160000007",
              "type": "application/json"
            }
          },
          "_id": "569f183514f4432160000007",
          "role": "admin",
          "email": "ariel@acme.com",
          "firstName": "Ariel",
          "lastName": "Flores"
        },
        "token": {
          "_links": {},
          "_id": "<string>",
          "name": "DevOps token",
          "ending": "2345",
          "serviceToken": false
        }
      },
      "status": "Started",
      "started": true,
      "_startedDate": 123,
      "configuration": {}
    }
  ],
  "_version": 1,
  "_links": {},
  "_releaseVariationId": "<string>",
  "_canceledAt": "1684262711507"
}

{
  "code": "invalid_request",
  "message": "Invalid request body"
}

{
  "code": "unauthorized",
  "message": "Invalid access token"
}

{
  "code": "not_found",
  "message": "Invalid resource identifier"
}

{
  "code": "rate_limited",
  "message": "You've exceeded the API rate limit. Try again later."
}