Function getCachableResponse

getCachableResponse(
request: Request,
response: Response,
): Promise<CacheResponse>

Creates a cacheable response object from a Request and Response pair. This function serializes the response content based on its content type and generates a hash for the request to be used as a cache key.

Parameters

request: Request
The original Request object
response: Response
The Response object to be cached

Returns Promise<CacheResponse>

A Promise that resolves to a CacheResponse object containing: - hash: The RequestHashObject with request details and hash - data: A SerializedResponse containing the content type and serialized content

Example

const request = new Request('https://api.example.com/data');
const response = await fetch(request);
const cacheResponse = await getCachableResponse(request, response);
// Returns: {
//   hash: {
//     hash: '01b5190db0c0f8c232d2ad4d8957d5f4',
//     file: 'api.example.com/01b5190db0c0f8c232d2ad4d8957d5f4.json',
//     url: URL object
//   },
//   data: {
//     contentType: 'application/json',
//     content: '{"serialized":"content"}'
//   }
// }

Source

export async function getCachableResponse(
  request: Request,
  response: Response,
): Promise<CacheResponse> {
  const reqHash = getRequestHash(request);

  // Generate a serialized object to be saved
  const dataType = contentType.parse(response.headers.get("content-type")?.toString() ?? "");

  const serializedResponse: SerializedResponse = {
    contentType: dataType.type,
  };

  const clonedResponse = response.clone();

  if (serializedResponse.contentType === "application/json") {
    // Json gets stringified
    serializedResponse.content = serialize(JSON.stringify(await clonedResponse.json()));
  } else {
    // Everything else is treated as text
    serializedResponse.content = serialize(await clonedResponse.text());
  }

  return {
    hash: reqHash,
    data: serializedResponse,
  } satisfies CacheResponse;
}