Synthetic monitoring
that doesn’t flake

import { chromium } from 'playwright';const { endpoint, token, id } = await fetch('https://api.browser.city/v1/sessions', {  method: 'POST',  headers: { Authorization: `Bearer ${process.env.BROWSERCITY_API_KEY}`, 'Content-Type': 'application/json' },  body: JSON.stringify({ browser: 'chromium' }),}).then((r) => r.json());try {  const browser = await chromium.connect(endpoint, {    headers: { Authorization: `Bearer ${token}` },  });  const page = browser.contexts().at(0)!.pages().at(0)!;  await page.goto('https://example.com');  if (!(await page.title()).toLowerCase().includes('example')) throw new Error('bad title');} finally {  await fetch(`https://api.browser.city/v1/sessions/${id}`, {    method: 'DELETE',    headers: { Authorization: `Bearer ${process.env.BROWSERCITY_API_KEY}` },  });}

import os, requestsfrom playwright.sync_api import sync_playwrightauth = {'Authorization': f"Bearer {os.environ['BROWSERCITY_API_KEY']}"}session = requests.post(    'https://api.browser.city/v1/sessions', headers=auth, json={'browser': 'chromium'}).json()endpoint = session['endpoint']token = session['token']session_id = session['id']playwright = Nonetry:    playwright = sync_playwright().start()    browser = playwright.chromium.connect(        endpoint,        headers={'Authorization': f'Bearer {token}'},    )    page = browser.contexts[0].pages[0]    page.goto('https://example.com')    if 'example' not in page.title().lower():        raise RuntimeError('bad title')finally:    try:        requests.delete(f'https://api.browser.city/v1/sessions/{session_id}', headers=auth)    finally:        if playwright:            playwright.stop()

using Microsoft.Playwright;using System.Net.Http.Headers;using System.Net.Http.Json;var http = new HttpClient();http.DefaultRequestHeaders.Authorization = new(    "Bearer", Environment.GetEnvironmentVariable("BROWSERCITY_API_KEY"));var session = await (await http.PostAsJsonAsync(    "https://api.browser.city/v1/sessions", new { browser = "chromium" }))    .Content.ReadFromJsonAsync<Session>();var (id, endpoint, token) = session!;IPlaywright? pw = null;try {    pw = await Playwright.CreateAsync();    var browser = await pw.Chromium.ConnectAsync(endpoint, new() {        Headers = new() { ["Authorization"] = $"Bearer {token}" }    });    var page = browser.Contexts[0].Pages[0];    await page.GotoAsync("https://example.com");    if (!(await page.TitleAsync()).ToLower().Contains("example")) throw new Exception("bad title");} finally {    try {        if (session is not null) await http.DeleteAsync($"https://api.browser.city/v1/sessions/{id}");    } finally {        pw?.Dispose();    }}record Session(string Id, string Endpoint, string Token);

import com.fasterxml.jackson.databind.ObjectMapper;import com.microsoft.playwright.*;import java.net.URI;import java.net.http.*;import java.util.Map;public class SyntheticMonitor {  public static void main(String[] args) throws Exception {    var key = System.getenv("BROWSERCITY_API_KEY");    var http = HttpClient.newHttpClient();    var json = new ObjectMapper();    var req = HttpRequest.newBuilder(URI.create("https://api.browser.city/v1/sessions"))        .header("Authorization", "Bearer %s".formatted(key))        .header("Content-Type", "application/json")        .POST(HttpRequest.BodyPublishers.ofString("{\"browser\":\"chromium\"}"))        .build();    var created = json.readValue(http.send(req, HttpResponse.BodyHandlers.ofString()).body(), Session.class);    var id = created.id();    var endpoint = created.endpoint();    var token = created.token();    Playwright pw = null;    try {      pw = Playwright.create();      var browser = pw.chromium().connect(endpoint,          new BrowserType.ConnectOptions().setHeaders(Map.of("Authorization", "Bearer %s".formatted(token))));      var page = browser.contexts().get(0).pages().get(0);      page.navigate("https://example.com");      if (!page.title().toLowerCase().contains("example")) throw new RuntimeException("bad title");    } finally {      try {        http.send(HttpRequest.newBuilder(URI.create("https://api.browser.city/v1/sessions/" + id))            .header("Authorization", "Bearer %s".formatted(key)).DELETE().build(), HttpResponse.BodyHandlers.discarding());      } finally {        if (pw != null) pw.close();      }    }  }  record Session(String id, String endpoint, String token) {}}