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Composition section`response.send`とは何ですか（redux-thunkのREADME.mdから）？
どこから来たのですか？
// This is very useful for server side rendering, because I can wait
// until data is available, then synchronously render the app.
store.dispatch(
makeSandwichesForEverybody()
).then(() =>
response.send(ReactDOMServer.renderToString(<MyApp store={store} />))
);