Fix: Unsupported protocol version between an MCP client and server (2025-11-25 vs 2026-07-28)
MCP error -32022 means your client opened at 2025-11-25 but the server only serves 2026-07-28. Make one side dual-era instead of pinning a version.
streamable-http
2 posts
How to Route MCP Traffic Through a Gateway With the Mcp-Method and Mcp-Name Headers
MCP 2026-07-28 mirrors the JSON-RPC method and target name into HTTP headers so a gateway can route, throttle, and audit without parsing the body. Here is a working gateway, plus the header-body agreement rule that will bite you.