fix(relay): gate githubcopilot.com MITM to Copilot so Cursor MCP servers connect#151
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NicolasGirardot
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Jul 21, 2026
…bypass loopback Cursor's remote MCP (e.g. github at api.githubcopilot.com/mcp/) is fetched via --proxy-server through Electron's net stack, which validates against the system cert store, not NODE_EXTRA_CA_CERTS. Because githubcopilot.com was on the always- MITM inference list, the relay terminated its TLS with the Edgee CA and the MCP failed with 'fetch failed'. githubcopilot.com and api.github.com are only inference/control-plane hosts for the Copilot-VS-Code relay, so MITM them only there; every other relay (cursor, claude, codex) blind-tunnels them so MCP servers reach the real host with the real certificate. Also set NO_PROXY for loopback so local MCP servers connect directly.
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Cursor fetches remote MCP servers (e.g. github at api.githubcopilot.com/mcp/) via --proxy-server through Electron's net stack, which validates TLS against the system cert store, not NODE_EXTRA_CA_CERTS. Because githubcopilot.com was always-MITM'd, the relay terminated its TLS with the untrusted Edgee CA → 'fetch failed'. Gate githubcopilot.com + api.github.com MITM to the Copilot-VS-Code relay only; other relays blind-tunnel them so MCP servers reach the real host with the real cert. Also set NO_PROXY for loopback.