Create multipart form data
import MultiData from "multi-data";
const formData = new MultiData("boundary-1234-abcd");
formData.append("data1", JSON.stringify({ data1: true }), {
headers: { "Content-ID": 1 },
});
formData.append("data2", JSON.stringify({ data2: true }), {
headers: { "Content-ID": 2 },
});
const res = await fetch("https://somewhere.com/batch", {
method: "POST",
headers: {
"Content-Type": `multipart/mixed; boundary=${formData.boundary}`,
},
data: formData.toString(),
});