Trying to renegotiate in Cloudflare calls API

I'm trying to renegotiate with api

const renegotiateResponse = await fetch(
${API_BASE}/sessions/${remoteSessionId}/renegotiate,
{
method: "PUT",
headers,
body: JSON.stringify({
sessionDescription: {
sdp: remoteAnswer.sdp,
type: "answer",
},
}),
}
).then((res) => res.json());

But getting {} this kind of response. What could be wrong with my code or backend side. Anyone can help me out in this?
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