in workbox-v4.3.1/workbox-background-sync.dev.js [249:276]
static async fromRequest(request) {
const requestData = {
url: request.url,
headers: {}
}; // Set the body if present.
if (request.method !== 'GET') {
// Use ArrayBuffer to support non-text request bodies.
// NOTE: we can't use Blobs becuse Safari doesn't support storing
// Blobs in IndexedDB in some cases:
// https://github.com/dfahlander/Dexie.js/issues/618#issuecomment-398348457
requestData.body = await request.clone().arrayBuffer();
} // Convert the headers from an iterable to an object.
for (const [key, value] of request.headers.entries()) {
requestData.headers[key] = value;
} // Add all other serializable request properties
for (const prop of serializableProperties) {
if (request[prop] !== undefined) {
requestData[prop] = request[prop];
}
}
return new StorableRequest(requestData);
}