All configured HTTP headers are reset when using Upload extension #1489

// STEP 1: Prove that destructuring isn't a good approach with a Header Object
const myHeaders = new Headers();
myHeaders.append("Content-Type", "text/xml");
myHeaders.append("Vary", "Accept-Language");

console.log("\n\nLogging headers: ", myHeaders)
console.log("Using destructuring: ", { ...myHeaders })
console.log("Converting to Object from entries: ", Object.fromEntries(myHeaders.entries()))


// STEP 2: Live test: inspect request payload sent @ https://graffle_upload.requestcatcher.com/
import { Graffle } from 'graffle'
import { Upload } from 'graffle/extensions/upload'
import { inspect } from 'node:util';

const graffle = Graffle
  .create()
  .transport({
    url: "https://graffle_upload.requestcatcher.com/",
    headers: {
      Authorization: 'Basic ' + Buffer.from("username:password").toString('base64'),
      'x-custom-header': 'MY_CUSTOM_VALUE',
    },
  })
  .use(Upload)
  .anyware(async ({ encode }) => {
    // Inspect requests contents 
    console.log("\n\nENCODE (before pack hook): ==> ", inspect(encode.input.transport, { depth: 3 }))
    const { pack } = await encode()
    console.log("\n\nPACK (after pack hook): ==> ", inspect(pack.input.transport, { depth: 3 }))
    return await pack()
  })


// Test Request with file
const data = graffle.gql(`
  mutation UploadFile($file: Upload!) {
    uploadFile(file: $file) {
      id
      url
    }
  }
`).$send({
  blob: new Blob([`Hello World: this is a file!`], { type: `text/plain` }),
})

try {
  let res = await data
  console.log("DATA IS :", res)

} catch (error) {
  // Expected error, as ping API will not respond with a JSON.
}