curl --request PUT \
  --url https://app.launchdarkly.com/api/v2/code-refs/repositories/{repo}/branches/{branch} \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data @- <<EOF
{
  "name": "main",
  "head": "a94a8fe5ccb19ba61c4c0873d391e987982fbbd3",
  "syncTime": "1636558831870",
  "updateSequenceId": 25,
  "references": [
    {
      "path": "/main/index.js",
      "hunks": [
        {
          "startingLineNumber": 45,
          "lines": "var enableFeature = 'enable-feature';",
          "projKey": "default",
          "flagKey": "enable-feature",
          "aliases": [
            "enableFeature",
            "EnableFeature"
          ]
        }
      ],
      "hint": "javascript"
    }
  ],
  "commitTime": "1636558831870"
}
EOF

import requests

url = "https://app.launchdarkly.com/api/v2/code-refs/repositories/{repo}/branches/{branch}"

payload = {
    "name": "main",
    "head": "a94a8fe5ccb19ba61c4c0873d391e987982fbbd3",
    "syncTime": "1636558831870",
    "updateSequenceId": 25,
    "references": [
        {
            "path": "/main/index.js",
            "hunks": [
                {
                    "startingLineNumber": 45,
                    "lines": "var enableFeature = 'enable-feature';",
                    "projKey": "default",
                    "flagKey": "enable-feature",
                    "aliases": ["enableFeature", "EnableFeature"]
                }
            ],
            "hint": "javascript"
        }
    ],
    "commitTime": "1636558831870"
}
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({
    name: 'main',
    head: 'a94a8fe5ccb19ba61c4c0873d391e987982fbbd3',
    syncTime: '1636558831870',
    updateSequenceId: 25,
    references: [
      {
        path: '/main/index.js',
        hunks: [
          {
            startingLineNumber: 45,
            lines: 'var enableFeature = \'enable-feature\';',
            projKey: 'default',
            flagKey: 'enable-feature',
            aliases: ['enableFeature', 'EnableFeature']
          }
        ],
        hint: 'javascript'
      }
    ],
    commitTime: '1636558831870'
  })
};

fetch('https://app.launchdarkly.com/api/v2/code-refs/repositories/{repo}/branches/{branch}', 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/code-refs/repositories/{repo}/branches/{branch}",
  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([
    'name' => 'main',
    'head' => 'a94a8fe5ccb19ba61c4c0873d391e987982fbbd3',
    'syncTime' => '1636558831870',
    'updateSequenceId' => 25,
    'references' => [
        [
                'path' => '/main/index.js',
                'hunks' => [
                                [
                                                                'startingLineNumber' => 45,
                                                                'lines' => 'var enableFeature = \'enable-feature\';',
                                                                'projKey' => 'default',
                                                                'flagKey' => 'enable-feature',
                                                                'aliases' => [
                                                                                                                                'enableFeature',
                                                                                                                                'EnableFeature'
                                                                ]
                                ]
                ],
                'hint' => 'javascript'
        ]
    ],
    'commitTime' => '1636558831870'
  ]),
  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/code-refs/repositories/{repo}/branches/{branch}"

	payload := strings.NewReader("{\n  \"name\": \"main\",\n  \"head\": \"a94a8fe5ccb19ba61c4c0873d391e987982fbbd3\",\n  \"syncTime\": \"1636558831870\",\n  \"updateSequenceId\": 25,\n  \"references\": [\n    {\n      \"path\": \"/main/index.js\",\n      \"hunks\": [\n        {\n          \"startingLineNumber\": 45,\n          \"lines\": \"var enableFeature = 'enable-feature';\",\n          \"projKey\": \"default\",\n          \"flagKey\": \"enable-feature\",\n          \"aliases\": [\n            \"enableFeature\",\n            \"EnableFeature\"\n          ]\n        }\n      ],\n      \"hint\": \"javascript\"\n    }\n  ],\n  \"commitTime\": \"1636558831870\"\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/code-refs/repositories/{repo}/branches/{branch}")
  .header("Authorization", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"name\": \"main\",\n  \"head\": \"a94a8fe5ccb19ba61c4c0873d391e987982fbbd3\",\n  \"syncTime\": \"1636558831870\",\n  \"updateSequenceId\": 25,\n  \"references\": [\n    {\n      \"path\": \"/main/index.js\",\n      \"hunks\": [\n        {\n          \"startingLineNumber\": 45,\n          \"lines\": \"var enableFeature = 'enable-feature';\",\n          \"projKey\": \"default\",\n          \"flagKey\": \"enable-feature\",\n          \"aliases\": [\n            \"enableFeature\",\n            \"EnableFeature\"\n          ]\n        }\n      ],\n      \"hint\": \"javascript\"\n    }\n  ],\n  \"commitTime\": \"1636558831870\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://app.launchdarkly.com/api/v2/code-refs/repositories/{repo}/branches/{branch}")

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  \"name\": \"main\",\n  \"head\": \"a94a8fe5ccb19ba61c4c0873d391e987982fbbd3\",\n  \"syncTime\": \"1636558831870\",\n  \"updateSequenceId\": 25,\n  \"references\": [\n    {\n      \"path\": \"/main/index.js\",\n      \"hunks\": [\n        {\n          \"startingLineNumber\": 45,\n          \"lines\": \"var enableFeature = 'enable-feature';\",\n          \"projKey\": \"default\",\n          \"flagKey\": \"enable-feature\",\n          \"aliases\": [\n            \"enableFeature\",\n            \"EnableFeature\"\n          ]\n        }\n      ],\n      \"hint\": \"javascript\"\n    }\n  ],\n  \"commitTime\": \"1636558831870\"\n}"

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

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

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

{
  "code": "forbidden",
  "message": "Forbidden. Access to the requested resource was denied."
}

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

{
  "code": "optimistic_locking_error",
  "message": "Conflict. Optimistic lock error. Try again later."
}

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