A headless browser runs a browser engine without displaying a normal graphical window. It can load pages, execute JavaScript, and expose the resulting DOM to automation code, which is useful for testing and for collection tasks that genuinely depend on browser rendering.
When to use one
First check whether the needed data is already present in the HTML or a documented endpoint. A direct HTTP request is often simpler and faster. Use a headless browser when content appears only after client-side execution or when the task requires a browser interaction that you are authorized to perform.
Headless does not mean stateless or identical to every visible browser. Rendering can depend on viewport, locale, cookies, fonts, and timing. Wait for a page-specific condition rather than a fixed sleep, and keep browser versions consistent when reproducing a result.
Browsers consume more resources than basic HTTP clients. Limit concurrency, close pages when done, and handle timeouts explicitly. A browser also does not bypass a site’s access rules.
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