HAR-Derived API Client

Drive a website once with a real browser while recording its network traffic to a HAR file, then distill that HAR into the site's private JSON API so you can call it directly with plain HTTP — far cheaper and faster than browser-controlling the page on every request. Credit: trick by Jared Longster, popularized by Dax (thdxr). This captures and replays; it does NOT bypass auth, solve CAPTCHAs, or defeat bot-detection — if the site needs a logged-in session, you carry its headers/cookies forward, you don't forge them.

The scripts are stdlib-plus-Playwright: capture needs Playwright, derivation is pure stdlib, replay needs only requests/httpx (or curl).

Covers every Hermes browser pathway: the default local browser_navigate backend, plus the cloud/remote backends (Browserbase, Browser-Use, Firecrawl) and any /browser connect CDP endpoint. There are two capture scripts — one for a browser you launch, one for a browser you attach to over CDP — because HAR recording works differently in each case (see How to Run).