I’m using Puppeteer connected to a self-hosted Browserless instance via WebSocket, but externalProxyServer does not seem to be applied.

My connection URL is:

wss://brows.harshchaudhary.dev/chromium?token=xx12345xx&launch={"stealth":true,"headless":false,"blockConsentModals":true,"externalProxyServer":"http://USERNAME:PASSWORD@p.webshare.io:80"}

Observed behavior:

• Browser launches successfully

• Pages load normally

• Outgoing IP remains my VPS IP instead of the proxy IP

• The proxy itself works via curl inside the Browserless container

• I have tried both raw and URL-encoded versions of the WebSocket URL (including encoded versions generated via ChatGPT)

Environment: self-hosted Browserless + Puppeteer over WebSocket.

Question:
Why is externalProxyServer not being applied in this setup?