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Merge pull request #243 from jlowin/mermaid

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Update mermaid diagram
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Jeremiah Lowin 2025-04-24 12:16:09 -04:00 • committed by GitHub
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18
docs/patterns/proxy.mdx
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@ -14,18 +14,20 @@ FastMCP provides a powerful proxying capability that allows one FastMCP server i
Proxying means setting up a FastMCP server that doesn't implement its own tools or resources directly. Instead, when it receives a request (like `tools/call` or `resources/read`), it forwards that request to a *backend* MCP server, receives the response, and then relays that response back to the original client.
```mermaid
sequenceDiagram
participant Client
participant ProxyServer as FastMCP Proxy Server
participant BackendServer as Backend MCP Server
participant ClientApp as Your Client (e.g., Claude Desktop)
participant FastMCPProxy as FastMCP Proxy Server
participant BackendServer as Backend MCP Server (e.g., remote SSE)
Client->>ProxyServer: Request (e.g., stdio)
ProxyServer->>BackendServer: Request (e.g., sse)
BackendServer-->>ProxyServer: Response (e.g., sse)
ProxyServer-->>Client: Response (e.g., stdio)
ClientApp->>FastMCPProxy: MCP Request (e.g. stdio)
Note over FastMCPProxy, BackendServer: Proxy forwards the request
FastMCPProxy->>BackendServer: MCP Request (e.g. sse)
BackendServer-->>FastMCPProxy: MCP Response (e.g. sse)
Note over ClientApp, FastMCPProxy: Proxy relays the response
FastMCPProxy-->>ClientApp: MCP Response (e.g. stdio)
```
### Use Cases
- **Transport Bridging**: Expose a server running on one transport (e.g., a remote SSE server) via a different transport (e.g., local Stdio for Claude Desktop).