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This patch implements a new mode of network tethering for Playwright server & its clients. With this patch: - playwright server could be launched with the `--browser-proxy-mode=tether` flag to engage in the new mode - a new type of client, "Network Tethering Client" can connect to the server to provide network traffic to the browsers - all clients that connect to the server with the `x-playwright-proxy: *` header will get traffic from the "Network Tethering Client" This patch also adds an environment variable `PW_OWNED_BY_TETHER_CLIENT`. With this env, playwright server will auto-close when the network tethering client disconnects. It will also auto-close if the network client does not connect to the server in the first 10 seconds of the server existence. This way we can ensure that `npx playwright docker start` blocks terminal & controls the lifetime of the started container.
See building instructions at /browser_patches/winldd/README.md