Contexto GET

using var http = new HttpClient();
http.DefaultRequestHeaders.Add("X-Api-Key", apiKey);

string json = await http.GetStringAsync("https://staging-api.mynexusapi.com/v1/contexto");
Console.WriteLine(json);

import os, requests

r = requests.get(
    "https://staging-api.mynexusapi.com/v1/contexto",
    headers={"X-Api-Key": os.environ["ECUAFACT_API_KEY"]},
    timeout=30)
print(r.status_code, r.text)

const res = await fetch('https://staging-api.mynexusapi.com/v1/contexto', {
  headers: { 'X-Api-Key': process.env.ECUAFACT_API_KEY }
});
console.log(res.status, await res.text());

<?php
$ch = curl_init('https://staging-api.mynexusapi.com/v1/contexto');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER => ['X-Api-Key: ' . getenv('ECUAFACT_API_KEY')],
]);
$respuesta = curl_exec($ch);
$estado = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
echo $estado . ' ' . $respuesta;

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

HttpClient cliente = HttpClient.newHttpClient();
HttpRequest peticion = HttpRequest.newBuilder()
    .uri(URI.create("https://staging-api.mynexusapi.com/v1/contexto"))
    .header("X-Api-Key", System.getenv("ECUAFACT_API_KEY"))
    .GET()
    .build();
HttpResponse<String> respuesta = cliente.send(peticion, HttpResponse.BodyHandlers.ofString());
System.out.println(respuesta.statusCode() + " " + respuesta.body());