Cloudflare DevelopersCD
Cloudflare Developers•2y ago
songhoyun

Issue with FormData Methods in Cloudflare Workers

I am currently developing an API using Cloudflare Workers and have encountered a technical issue with handling FormData objects. Specifically, I am unable to use the form.getBuffer() and form.getBoundary() methods as they are seemingly not recognized as functions. Here is the relevant part of my code:

const form = new FormData();
form.append("manifest", JSON.stringify(manifest), {
  contentType: "application/json",
  header: {
    "content-type": "application/json; charset=utf-8",
    ...(signature ? { "expo-signature": signature } : {}),
  },
});
form.append("extensions", JSON.stringify({ assetRequestHeaders }), {
  contentType: "application/json",
});

return c.newResponse(form.getBuffer(), {
  status: 200,
  headers: {
    "expo-protocol-version": protocolVersion.toString(),
    "expo-sfv-version": "0",
    "cache-control": "private, max-age=0",
    "content-type": `multipart/mixed; boundary=${form.getBoundary()}`,
  },
});


Upon attempting to execute this, I receive the following errors:

  • TypeError: form.getBuffer is not a function
  • TypeError: form.getBoundary is not a function
Could you please advise on how to correctly implement these methods, or suggest an alternative approach to handle multipart/form-data in Cloudflare Workers? Your guidance on how to properly structure this type of request would be greatly appreciated.

Thank you for your assistance.

Best regards,
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