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The library `http-proxy-middleware is a great tool to use when you want to proxy requests to an API. It only takes a couple of lines of code to set up and use, and it's very flexible. When you use this client in your React application to send requests to a GraphQL API, React will execute the request on the client side. This means that the request is visible from the network tab in the browser, and when you're building an application that external users use they will be able to see this API key.