curl --request GET \
  --url https://matcher.sandbox.lerian.net/v1/contexts/{contextId}/sources/{sourceId} \
  --header 'Authorization: Bearer <token>'

package main

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

func main() {

	url := "https://matcher.sandbox.lerian.net/v1/contexts/{contextId}/sources/{sourceId}"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("Authorization", "Bearer <token>")

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

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

	fmt.Println(string(body))

}

const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};

fetch('https://matcher.sandbox.lerian.net/v1/contexts/{contextId}/sources/{sourceId}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://matcher.sandbox.lerian.net/v1/contexts/{contextId}/sources/{sourceId}"

headers = {"Authorization": "Bearer <token>"}

response = requests.get(url, headers=headers)

print(response.text)