APIs•7 min read•intermediate

MCP stdio vs HTTP: Security and Transport Architecture

Compare local process stdio isolation with remote HTTP MCP transports under the 2026-07-28 specification.

stdio Transport: Local Process Boundaries

stdio transport launches MCP servers as local child processes over standard input and output streams. Security considerations include avoiding unpinned `npx` packages, preventing execution from temporary folders, and passing arguments safely without intermediate shell interpreters.

HTTP Transport: Stateless Core and Routing Headers

HTTP transport under the 2026-07-28 specification requires TLS (HTTPS) for remote communication and uses stateless request routing headers (`Mcp-Method`, `Mcp-Name`) to enable transparent caching and proxying.

Applied Engineering

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