playwright/packages/playwright-core/bin/socks-certs/README.md

Certfificates for Socks Proxy

These certificates are used when client certificates are used with Playwright. Playwright then creates a Socks proxy, which sits between the browser and the actual target server. The Socks proxy then does the TLS upgrade using the certficiates in this directory (locally) while maintaining the client certificates to the target server. The certificates are generated via:

openssl req -new -newkey rsa:2048 -days 3650 -nodes -x509 -keyout key.pem -out cert.pem -subj "/CN=localhost"