curl \
  -X POST 'MEILISEARCH_URL/export' \
  -H 'Content-Type: application/json' \
  --data-binary '{
    "url": "TARGET_INSTANCE_URL",
    "indexes": {
      "*": {
        "overrideSettings": true
      }
    }
  }'

import requests

url = "http://localhost:7700/export"

payload = {
    "url": "https://ms-1234.heaven.meilisearch.com",
    "apiKey": "1234abcd",
    "payloadSize": "24MiB",
    "indexes": { "*": { "filter": None } }
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    url: 'https://ms-1234.heaven.meilisearch.com',
    apiKey: '1234abcd',
    payloadSize: '24MiB',
    indexes: {'*': {filter: null}}
  })
};

fetch('http://localhost:7700/export', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_PORT => "7700",
  CURLOPT_URL => "http://localhost:7700/export",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'url' => 'https://ms-1234.heaven.meilisearch.com',
    'apiKey' => '1234abcd',
    'payloadSize' => '24MiB',
    'indexes' => [
        '*' => [
                'filter' => null
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "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 := "http://localhost:7700/export"

	payload := strings.NewReader("{\n  \"url\": \"https://ms-1234.heaven.meilisearch.com\",\n  \"apiKey\": \"1234abcd\",\n  \"payloadSize\": \"24MiB\",\n  \"indexes\": {\n    \"*\": {\n      \"filter\": null\n    }\n  }\n}")

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

	req.Header.Add("Authorization", "Bearer <token>")
	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.post("http://localhost:7700/export")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"url\": \"https://ms-1234.heaven.meilisearch.com\",\n  \"apiKey\": \"1234abcd\",\n  \"payloadSize\": \"24MiB\",\n  \"indexes\": {\n    \"*\": {\n      \"filter\": null\n    }\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("http://localhost:7700/export")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"url\": \"https://ms-1234.heaven.meilisearch.com\",\n  \"apiKey\": \"1234abcd\",\n  \"payloadSize\": \"24MiB\",\n  \"indexes\": {\n    \"*\": {\n      \"filter\": null\n    }\n  }\n}"

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

{
  "taskUid": 1,
  "status": "enqueued",
  "type": "export",
  "enqueuedAt": "2021-08-11T09:25:53.000000Z"
}

{
  "message": "The Authorization header is missing. It must use the bearer authorization method.",
  "code": "missing_authorization_header",
  "type": "auth",
  "link": "https://docs.meilisearch.com/errors#missing_authorization_header"
}