ExMCP.Plugs.ProtocolVersion (ex_mcp v1.0.0-rc.8)

Plug for validating and extracting the MCP-Protocol-Version header.

This plug ensures that incoming HTTP requests carry a protocol version the server actually supports.

Behavior

If no header is present, the configured default (also returned by ExMCP.protocol_version/0) is assumed
If an unsupported version is provided, returns 400 Bad Request
Adds the validated version to conn.assigns[:mcp_version]

The supported list and default come from ExMCP's canonical internal version registry, so clients, server transports, and this plug cannot drift.

plug ExMCP.Plugs.ProtocolVersion

Get the default protocol version.

Get the list of supported protocol versions.

@spec default_version() :: String.t()

Get the default protocol version.

@spec supported_versions() :: [String.t()]

Get the list of supported protocol versions.