Readable stream to read JSON-RPC lines from (default: stdin).
Writable stream to write responses to (default: stdout).
Injectable fetch (default: global fetch).
Optionalinit: RequestInitOptionalinit: RequestInitPromise that resolves when the input stream closes.
Run the fetch-proxy MCP server, reading JSON-RPC messages from
inputand writing responses tooutput.Does not resolve until the input stream closes.