MCP Router: maxResponseBodyBytes

maxResponseBodyBytes bounds MCP responses and buffered downstream responses.

• Type: Integer of at least 2048, in bytes
• Default: 4194304 (4 MiB)

The router checks known Content-Length, enforces the limit while buffering, and bounds serialized JSON-RPC results such as tools/list. Oversized backend or catalog results fail safely instead of allocating without limit. Values below 2048 reject configuration because the gateway reserves enough space for bounded protocol error responses.