service worker缓存是否支持cache-controlheaders？

Question

Service Worker 缓存是否支持 cache-control headers？例如，如果缓存中的条目具有 headers cache-control: no-store 或 cache-control: max-age=60，这些是否受到 match() 的尊重？

尽管 header cache-control: no-store 出现在响应中，但以下代码输出 CACHE HIT。（我认为同样的问题适用于 max-age。）

function warm(c) {
  var req = new Request("/foo.txt");
  var res = new Response("hello", {
    status: 200,
    statusText: "OK",
    headers: new Headers({
      "cache-control": "no-store",
      "content-type": "text/plain"
    })
  });
  return c.put(req, res).then(function () { return c; });
}

function lookup(c) {
  return c.match(new Request("/foo.txt")).then(function (r) {
    return r ? "CACHE HIT" : "CACHE MISS";
  });
}

function deleteAllCaches() {
  return caches.keys().then(function (cacheNames) {
    return Promise.all(
      cacheNames.map(function (cacheName) {
        return caches.delete(cacheName);
      })
    );
  });
}

self.addEventListener('install', function (event) {
  event.waitUntil(
    deleteAllCaches()
    .then(caches.open.bind(caches, 'MYCACHE'))
    .then(warm)
    .then(lookup)
    .then(console.log.bind(console))
    .then(function () { return true; })
  );
});

Answer 1

Service Worker 缓存的行为与规范中的标准 RFC-compliant HTTP cache. In particular, it ignores all headers that relate to "freshness" (such as cache-control). Note, however, that it does behave as expected with respect to the vary header. (See the cache resolution algorithm 不同。）

如果您想要符合 HTTP 的缓存行为，您需要将其置于现有缓存功能之上。

service worker缓存是否支持cache-controlheaders？

Does the service worker cache support cache-control headers?

javascript

cache-control

service-worker