docs: Add deployment guidelines for proxying MCP servers#2528
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Closes modelcontextprotocol#2528 Covers the proxy-specific config changes needed for production MCP deployments: required header forwarding (Mcp-Session-Id, Mcp-Protocol-Version, Authorization, Last-Event-ID), SSE buffering disabled, session affinity, connection timeouts, SSRF protection for user-supplied backend URLs, payload logging guidance, and TLS end-to-end recommendations. Includes config examples for nginx, Caddy, Traefik, AWS ALB, and Cloudflare, plus a summary checklist.
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Split from #2521 per feedback from @localden. This PR adds operational guidance for deploying MCP servers behind reverse proxies and API gateways.
Covers:
This is a standalone docs article with practical configuration examples. No spec changes.