curl --request GET \
  --url https://zglosscammera.pl/api/discord/avatar/{discordId}

const options = {method: 'GET'};

fetch('https://zglosscammera.pl/api/discord/avatar/{discordId}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://zglosscammera.pl/api/discord/avatar/{discordId}"

response = requests.get(url)

print(response.text)

{
  "error": "Nieprawidłowe ID"
}

{
  "error": "Nie znaleziono użytkownika"
}