Free HTTP inspector: Watch HTTP requests and replay them, in your browser.

An HTTP debugging proxy for the lab's practice sites: browse a site and watch every request in an HTTP history, then open one in the repeater to change the method, headers or body and resend it, seeing the raw response. Everything runs locally against the built-in practice APIs; no real network is touched.

Free, no login, nothing to install. Your work stays in this browser.

What you can do

• Browse a practice site and capture every HTTP request
• Inspect a request's method, headers, body and response
• Resend a request with changes in the repeater
• Compare how the server answers different requests

Graded, AI-assisted versions live in API, web development and web security courses.