CD
Cloudflare Developers•15mo ago
x0nifo

purging fetch cache that uses a custom cache key

I'm using Workers to proxy requests to an origin server and cache the responses using the fetch cache. Essentially I'm doing something like: 
// processes request to https://example.com/foo.json
export default {
  async fetch(request) {
    const url = new URL(request.url);
    const cacheKey = `https://${url.hostname}${url.pathname}`;

    const headers = new Headers(request.headers);
    headers.set("x-foo", url.host);

    # rewrite host so that we proxy to origin
    url.host = 'originserver.com'
    
    let response = await fetch(url.toString(), {
      cf: {
        cacheKey: cacheKey,
        cacheTtl: cacheTtlSec,
        cacheEverything: true,
        cacheTtlByStatus: {
          '100-199': 0,
          '200-299': cacheTtlSec,
          '300-599': 0,
        }
      },
      headers: headers,
    });
    response = new Response(response.body, response);
 
    return response;
  },
};
// processes request to https://example.com/foo.json
export default {
  async fetch(request) {
    const url = new URL(request.url);
    const cacheKey = `https://${url.hostname}${url.pathname}`;

    const headers = new Headers(request.headers);
    headers.set("x-foo", url.host);

    # rewrite host so that we proxy to origin
    url.host = 'originserver.com'
    
    let response = await fetch(url.toString(), {
      cf: {
        cacheKey: cacheKey,
        cacheTtl: cacheTtlSec,
        cacheEverything: true,
        cacheTtlByStatus: {
          '100-199': 0,
          '200-299': cacheTtlSec,
          '300-599': 0,
        }
      },
      headers: headers,
    });
    response = new Response(response.body, response);
 
    return response;
  },
};
Is there a way to purge this fetch cache via the API, using the Purge Cache endpoint? I've tried doing: 
curl -s -X POST "https://api.cloudflare.com/client/v4/zones/xxx/purge_cache" -H "Authorization: Bearer xxx"  -H "Content-Type: application/json" -d '{"files":["https://originserver.com/foo.json"]}'
curl -s -X POST "https://api.cloudflare.com/client/v4/zones/xxx/purge_cache" -H "Authorization: Bearer xxx"  -H "Content-Type: application/json" -d '{"files":["https://originserver.com/foo.json"]}'
but that didn't seem to have an effect in the subsequent requests to the cached resource (i.e. I always get CF-Cache-Status: HIT and Last-Modified remains unchanged). I then tried different combinations like: 
{"files":[{"url":"https://originserver.com/foo.json", "headers": {"x-foo": "example.com"}}]}
{"files":[{"url":"https://originserver.com/foo.json", "headers": {"x-foo": "example.com"}}]}
But that didn't work either. Any insights would be greatly appreciated.
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