fetch/http-cache/heuristic.html

<!doctype html>
<html>
  <head>
    <meta charset="utf-8">
    <title>HTTP Cache - Heuristic Freshness</title>
    <meta name="help" href="https://fetch.spec.whatwg.org/#request">
    <meta name="timeout" content="long">
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <script src="/common/utils.js"></script>
    <script src="/common/get-host-info.sub.js"></script>
    <script src="http-cache.js"></script>
  </head>
  <body>
    <script>
    var tests = [
      {
        name: 'HTTP cache reuses an unknown response with Last-Modified based upon heuristic freshness when Cache-Control: public is present.',
        requests: [
          {
            response_status: [299, "Whatever"],
            response_headers: [
              ['Last-Modified', http_date(-3 * 100)],
              ['Cache-Control', 'public']
            ],
          },
          {
            expected_type: "cached",
          }
        ]
      },
      {
        name: 'HTTP cache does not reuse an unknown response with Last-Modified based upon heuristic freshness when Cache-Control: public is not present.',
        requests: [
          {
            response_status: [299, "Whatever"],
            response_headers: [
              ['Last-Modified', http_date(-3 * 100)],
              ['Cache-Control', 'public']
            ],
          },
          {
            expected_type: "not_cached",
          }
        ]
      }
    ];

    function check_status(status) {
      var succeed = status[0];
      var code = status[1];
      var phrase = status[2];
      var body = status[3];
      if (body === undefined) {
        body = http_content(code);
      }
      var expected_type = "not_cached";
      var desired = "does not use"
      if (succeed === true) {
        expected_type = "cached";
        desired = "reuses";
      }
      tests.push(
        {
          name: 'HTTP cache ' + desired + ' a ' + code + ' ' + phrase + ' response with Last-Modified based upon heuristic freshness.',
          requests: [
            {
              response_status: [code, phrase],
              response_headers: [
                ['Last-Modified', http_date(-3 * 100)]
              ],
              response_body: body,
            },
            {
              expected_type: expected_type,
              response_status: [code, phrase],
              response_body: body,
            }
          ]
        }
      )
    }
    [
      [true, 200, 'OK'],
      [true, 203, "Non-Authoritative Information"],
      [true, 204, "No Content", ""],
      [true, 404, "Not Found"],
      [true, 405, "Method Not Allowed"],
      [true, 410, "Gone"],
      [true, 414, "URI Too Long"],
      [true, 501, "Not Implemented"]
    ].forEach(check_status);
    [
      [false, 201, 'Created'],
      [false, 202, "Accepted"],
      [false, 403, "Forbidden"],
      [false, 502, "Bad Gateway"],
      [false, 503, "Service Unavailable"],
      [false, 504, "Gateway Timeout"],
    ].forEach(check_status);
    run_tests(tests);
    </script>
  </body>
</html>