Cloudflare R2 Worker throwing 'Network Connection Lost' error - cloudflare

Question

In my worker I am converting a base64 string I get from the request to a blob with some function. However, when I try to PUT the blob into my bucket, I get "Network Connection Lost" error. I can successfully PUT just the base64 string or any other string but not a blob. Here is my worker:
// Function to convert b64 to blob (working fine)
function b64toBlob(b64Data, contentType, sliceSize=512) {
const byteCharacters = atob(b64Data);
const byteArrays = [];
for (let offset = 0; offset < byteCharacters.length; offset += sliceSize) {
const slice = byteCharacters.slice(offset, offset + sliceSize);
const byteNumbers = new Array(slice.length);
for (let i = 0; i < slice.length; i++) {
byteNumbers[i] = slice.charCodeAt(i);
}
const byteArray = new Uint8Array(byteNumbers);
byteArrays.push(byteArray);
}
const blob = new Blob(byteArrays, {type: contentType});
return blob;
}
export default {
async fetch(request, env) {
const url = new URL(request.url);
const key = url.pathname.slice(1);
switch (request.method) {
case 'PUT':
const contentType = 'application/pdf';
const b64Data = request.body;
const blob = b64toBlob(b64Data, contentType);
try {
await env.qa_sub_agreements_bucket.put(key, blob, { // Failing here
httpMetadata: request.headers,
})
return new Response(blob) // Successfully returns the blob when above PUT is commented out
} catch (e) {
console.error(e.message, e.stack); // Logs out "Error: Network Connection Lost"
}

Answer 1

Hard to say definitively because the Worker posted doesn't appear to be totally complete. An eagle-eyed coworker spotted that it looks like the problem may be that you're invoking atob on a ReadableStream and likely that conversion is what's throwing the exception.