Check MCP-Protocol-Version, Mcp-Method and named-target routing headers for a Streamable HTTP request.
Modern Streamable HTTP requests expose protocol and routing information in headers so gateways and authorization systems can route requests without parsing the entire JSON body.
Validate MCP 2026-07-28 HTTP routing headers against the JSON-RPC request body.
Use MCP HTTP Header Validator as a focused pre-flight utility while building, reviewing or debugging an MCP integration. Paste the relevant configuration, protocol message, metadata, schema or value into the tool and review the returned findings before the same data reaches a production client or server.
Protocol checks are especially useful when debugging interoperability between different MCP clients, servers, gateways and SDK versions. The tool analyzes the data you provide and does not initiate a live MCP exchange.
A clean result means the input passed the rules implemented by this utility. It does not guarantee application security, protocol interoperability or correct business behavior. Test important integrations against the exact MCP client, SDK, gateway and server versions used in your deployment.