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I Cracked Cursor IDE's Walled Garden with a Copilot Proxy – Here's the Dirty Hack

Cursor's slick UI deserves better than its paywall prison. This proxy hack tunnels it straight to Copilot – and calls bullshit on closed AI gardens.

DevTools Feed Apr 03, 2026 3 min read
Diagram showing Cursor IDE proxy flow to GitHub Copilot servers

⚡ Key Takeaways

  • MITM proxy tricks Cursor into using Copilot backend via port 4141/4142 tandem.
  • Prefix 'cus-' and AST cleaner bypass routing and schema mismatches.
  • Exposes walled-garden flaws; predicts open forks ahead.
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#Cursor IDE #GitHub Copilot #MITM proxy #reverse engineering

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Originally reported by dev.to

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