File Uploads with Apollo Server 2.0

The Apollo Server 2.0 has been updated with a feature that allows file uploads in GraphQL, enabling developers to upload files as part of their mutations. This feature is based on the GraphQL multipart form requests specification and follows the client-server workflow for uploading files. The server returns an upload promise that resolves an object containing information about the uploaded file, such as its filename, mimetype, encoding, and stream. To use this feature, developers need to install the `apollo-upload-client` package and set up a schema with the `Upload` type. They can then send multipart requests in their mutations, which will be handled by the server-side resolver function. The client can validate the file before sending it to the server and handle multiple files or blobs using different approaches. A full-stack example is available on GitHub for developers to try out and learn more about this feature.

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