{"service":"Unified MCP Gateway","version":"1.0.0","usage":{"method1":"POST / with X-Target-URL header (or X-MCP-Target alias)","method2":"POST /token?target=https://oauth.example.com/token (query target fallback)","method3":"https://{slug}.run.mcp-use.com/mcp (subdomain/custom-domain routing)"},"examples":["POST / -H \"X-Target-URL: https://mcp.linear.app/mcp\"","POST / -H \"X-MCP-Target: https://mcp.linear.app/mcp\"","POST /token?target=https://mcp.linear.app/token","POST https://winter-sun-1234.run.mcp-use.com/mcp"],"headers":{"required":["Content-Type"],"optional":["Authorization","X-Target-URL","X-MCP-Target","X-Server-Id","X-User-Id","Mcp-Session-Id"]}}