A Playwright script can look stable until a proxy enters the workflow.

Without a proxy, the page opens. The selector works. The click happens. The test passes.

Then you add a proxy.

Suddenly the page hangs. Authentication fails. Login behaves differently. A request times out. The same script works in visible mode but fails in headless mode . A retry succeeds once and fails again five minutes later.

The first reaction is usually simple:

The proxy is bad.

Sometimes that is true.

But a Playwright proxy failure is not always a proxy failure. It can be a browser context , proxy authentication , profile state , region mismatch , or retry-boundary problem.

If you debug all of those as “proxy not working,” you will waste time changing IPs while the real issue stays hidden.

Why Playwright proxy bugs are hard to diagnose

Proxy issues are hard to debug because they sit between several layers:

the proxy server

the Playwright launch configuration

the browser engine

the browser context

the target site

the…