// Open a multipart file file, _ := multipartFile.Open() // Seek to a specific position in the file file.Seek(0, io.SeekStart)
// Create a new multipart writer writer := multipart.NewWriter(body) // Add a file to the multipart request part, _ := writer.CreateFormFile("file", "example.txt") // Open the file file, _ := os.Open("example.txt") // Seek to a specific position in the file file.Seek(0, io.SeekStart) // Copy the file contents to the multipart request io.Copy(part, file)This code creates a new `multipart.Writer` and adds a file to the request. It then opens the file and seeks to the beginning of the file before copying its contents to the multipart request. The package `mime/multipart` provides the `File` and `FormData` types that enable us to work with multipart data.