TS fetch streaming for GC web message archiver payload

NICE CXone API & Integrations
1

How do you wire up the /api/v2/conversations/webchat/export endpoint when you need to bundle conversation ID ranges with media flags and retention directives in TypeScript? I’m spinning up a CLI archiver and it’s choking on the gzip headers right after the first chunk drops.

{
 "conversationIds": ["wc_123", "wc_124"],
 "includeMedia": true,
 "retentionPolicy": "standard_7yr",
 "chunkSize": 5242880
}

The node response throws a 413 immediately, and I can’t tell if the resumable range headers are clashing with the platform’s storage quota checks or if the webhook callback for the data lake sync is just timing out.

2

You might try adjusting the GZIP DECODE flag before the FETCH STREAM initializes. Gzip headers drop early. It’s usually a decompression mismatch. The EXPORT ENDPOINT expects a manual inflate step when handling binary payloads. Set the CHUNK SIZE parameter explicitly and pipe the response through a standard stream.

const stream = response.body.pipeThrough(new DecompressionStream('gzip'));
for await (const chunk of stream) { /* process */ }
3 
const res = await fetch(url, {
 method: 'POST',
 headers: { 'Content-Type': 'application/json', 'Accept-Encoding': 'gzip' },
 body: JSON.stringify(payload)
});

// Verify encoding before piping to avoid magic byte errors
if (res.headers.get('Content-Encoding') !== 'gzip') {
 throw new Error('Unexpected encoding');
}

const stream = res.body?.pipeThrough(new DecompressionStream('gzip'));

nice-cxone-studio-sdk handles the export stream differently when you route it through a REST Proxy, so we tried the pipeThrough approach mentioned above first and it failed hard when the chunk boundary hit a JSON object mid-character. It’s a pain to debug because the error logs don’t show the raw bytes. We forced a manual buffer accumulation using TextDecoder before parsing, which fixed the truncation error but introduced a memory spike on large archives. Does your CLI handle partial chunk reassembly? We had to write a custom buffer for that. We also tried disabling compression entirely by passing compress: false in the request options, but that just returned a 406 Not Acceptable from the export service. The Accept-Encoding header needs to be explicit because the default fetch behavior sometimes negotiates br instead of gzip, causing the decompression stream to choke on the magic bytes. You’ll want to verify the Content-Encoding response header actually matches gzip before piping, otherwise you’ll get a TypeError on the stream processor. The stream usually resets if you miss the header check.