Roundtrip
A hands-on way to learn how the web works underneath, with no network code and no internet connection. You assemble an HTTP request piece by piece — choose a method, set the path, add headers, write a body — then watch the round trip play out step by step, so the machinery behind every web page becomes visible.
It is a teaching simulation rather than a real client. Requests run against a small simulated server with endpoints worth exploring, and Roundtrip shows the raw message that would go out alongside the response it produces: status line, headers, body, and the status code explained in plain language so you finally know your 200 from your 404 from your 500.
- Guided lessons covering methods, status codes, headers and message structure, each with a challenge to build the right request — and a hint when you are stuck.
- An endpoints map showing exactly what the simulated server understands, so paths are never guesswork.
- A tappable reference of common methods, status codes and headers, each with a real example.
- Saved request history and progress milestones as you cover more of what HTTP can do.
- Runs entirely on the device. No account, no connection, no advertising, no analytics.
Send a requestthe same simulated server the app ships with — nothing leaves this page
Method
Path
Headers
Body
REQUEST
RESPONSE
request out
response back