// This tests that when the proxy server returns a 500 response, the client can
// handle it correctly.

import * as common from '../common/index.mjs';
import assert from 'node:assert';
import { once } from 'events';
import http from 'node:http';
import { createProxyServer, runProxiedRequest } from '../common/proxy-server.js';

// Start a server to process the final request.
const server = http.createServer(common.mustCall((req, res) => {
  req.destroy();
}, 1));
server.on('error', common.mustNotCall((err) => { console.error('Server error', err); }));
server.listen(0);
await once(server, 'listening');

// Start a minimal proxy server.
const { proxy, logs } = createProxyServer();
proxy.listen(0);
await once(proxy, 'listening');

const serverHost = `localhost:${server.address().port}`;
const requestUrl = `http://${serverHost}/test`;

const { code, signal, stderr, stdout } = await runProxiedRequest({
  NODE_USE_ENV_PROXY: 1,
  REQUEST_URL: requestUrl,
  HTTP_PROXY: `http://localhost:${proxy.address().port}`,
});

// The proxy client should receive a well-formed 500 response.
assert.match(stdout, /Proxy error ECONNRESET: socket hang up/);
assert.match(stdout, /Status Code: 500/);
assert.strictEqual(stderr.trim(), '');
assert.strictEqual(code, 0);
assert.strictEqual(signal, null);

// The proxy should receive a GET request.
assert.deepStrictEqual(logs[0], {
  method: 'GET',
  url: requestUrl,
  headers: {
    'connection': 'keep-alive',
    'proxy-connection': 'keep-alive',
    'host': serverHost,
  },
});

// The proxy should receive a ECONNRESET from the target server, and then send
// 500 to the client.
assert.strictEqual(logs[1].source, 'proxy request');
assert.strictEqual(logs[1].error.code, 'ECONNRESET');
proxy.close();
server.close();