Guides and tutorials for developers: exposing localhost, testing webhooks, running MCP servers, self-hosting and everyday dev tooling.
Jarek Ceborski13 min read
GitHub webhook "We couldn't deliver this payload"? What each error means, from connect failures and timeouts to x509, 404 and 502, and the fix for each.
Recent posts
14 min read
Shopify webhook not firing? A missing scope fails with HTTP 200, a slow 200 is a failure and retries end after 4 hours, each shown with a captured request.
10 min read
php2shell (CVE-2026-109618) on a dev laptop: find Herd, Valet and artisan serve sites behind a tunnel, check their PHP version, and lock them until patched.
11 min read
How to get feedback on a website prototype: what to send reviewers, where they should comment, and what a pinned comment records that a screenshot loses.
15 min read
How to test Stripe webhooks locally: forward events with stripe listen, or point an event destination at a Public URL, then inspect and replay the delivery.
More posts
How to open localhost on your phone: the LAN IP on the same Wi-Fi, the dev server flag it needs, and a Public URL for HTTPS or another network.
10 min read
State of MCP server development in October 2026: a census of 43,012 registry servers, a 500-server handshake probe, the 2026-07-28 spec and SDK numbers.
16 min read
A Tailscale Funnel alternative for sharing localhost outside your tailnet: Funnel's limits, measured bandwidth and URL delays, and custom domains.
9 min read
How to password protect a prototype link on Figma, Vercel, Netlify or your own laptop, what each one costs, and why a JavaScript prompt protects nothing.
10 min read
The localtunnel error "connection refused: localtunnel.me:PORT (check your firewall settings)" is rarely a firewall. Why lt crashes after a sleep, and the fix.
9 min read
Ngrok alternatives compared on free tiers, prices and what a visitor sees first: LocalCan, Cloudflare Tunnel, zrok, localtunnel, PageKite and Tailscale.
12 min read
npx expo start --tunnel runs Metro through Expo's shared ngrok account. What it does, why it fails, and how to point Expo Go at your own stable Public URL.
14 min read
Build an invisible CAPTCHA with no puzzles: the browser measures how a form is filled in, and TypeSafe's Jev decides if a person or an AI agent did it.
25 min read
Discover how local tunneling tools simplify secure internet access to localhost applications, ideal for development, testing, and remote collaboration.
17 min read
How to share a vibe-coded app with a client: Figma, Vercel, Netlify, ngrok, and a Snapshot you publish from the app in one click, with feedback pinned on the page.
15 min read
Secure an MCP server with OAuth 2.1 using Scalekit, connect it to Claude, and see why a stable public URL is non-negotiable for the OAuth callback.
10 min read
Build a local MCP server, expose it with a public HTTPS URL, and connect it to Claude.ai. A working TypeScript walkthrough with the version gotchas named.
12 min read
The npm security best practices we just rolled out across every LocalCan repo to defend against supply chain attacks: lockfile discipline, install-time cooldowns, --ignore-scripts, digest-pinned images, and locking down CI.
12 min read
A workflow built on context management, lead/implementer/reviewer agents, and ruthless planning. What works for me on multi-repo, multi-language codebases.
12 min read
LocalCan 3.0 Beta brings a CLI, YAML configuration, Linux support, multiple endpoints per service, and a global edge network — the biggest update since the app launched.
4 min read
Learn how to create Stripe-style prefixed IDs like cus_abc123 or team_xyz789 in Postgres using Nano ID. No extensions required.
9 min read
Learn how to self-host Next.js on any VPS using Docker Swarm and a GitLab CI pipeline. This tutorial shows how to create a blog with Postgre as data source.
17 min read
Discover which tunneling service leads in speed for 2025. We compare Ngrok, Cloudflare Tunnel, LocalCan, Pinggy, and LocalXpose - see who tops the chart!
8 min read
Learn how AbortController can cancel fetch requests, event listeners, streams, child processes in JavaScript. Stop memory leaks and improve UX with examples
12 min read
Discover 8 underrated macOS developer tools that can supercharge your workflow. From tunneling to API testing, find efficient alternatives to mainstream tools.
9 min read
Rate-limit and protect your WebSocket server from DDoS attacks with strategies using Cloudflare firewall (WAF). Example code implementation with CloudflareAPI, Fastify and node-cache.
6 min read
Learn how to create self-signed certificates for local development using OpenSSL and JavaScript (Node.js). Mirror your production environment closely to test critical features like authentication, secure cookies, service workers, PWAs, and the Geolocation API. Simplify the process with practical examples and step-by-step instructions.
4 min read