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Merge pull request #290 from koic/thread_model_requirement

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[Doc] Clarify that `StreamableHTTPTransport` requires a single-process server
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Koichi ITO 2026-04-04 05:51:58 +09:00 • committed by GitHub
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@ -350,6 +350,13 @@ transport = MCP::Server::Transports::StreamableHTTPTransport.new(server, session
### Usage
> [!IMPORTANT]
> `MCP::Server::Transports::StreamableHTTPTransport` stores session and SSE stream state in memory,
> so it must run in a single process. Use a single-process server (e.g., Puma with `workers 0`).
> Multi-process configurations (Unicorn, or Puma with `workers > 0`) fork separate processes that
> do not share memory, which breaks session management and SSE connections.
> Stateless mode (`stateless: true`) does not use sessions and works with any server configuration.
#### Rails Controller
When added to a Rails controller on a route that handles POST requests, your server will be compliant with non-streaming