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<title>CORS - 304 Responses</title>
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<meta name=author title="Mark Nottingham" href="mailto:mnot@mnot.net">

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<h1>CORS - 304 Responses</h1>
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<script>


/*
 * 304 Responses
 */

// A header used to correlate requests and responses
var state_header = "content-language"

/* Make a request; call ready(client) when done */
function req(url, id, t, ready) {
  var client = new XMLHttpRequest()
  client.open('GET', url, true)
  client.setRequestHeader(state_header, id)
  client.send()
  client.onreadystatechange = function() {
    if (client.readyState == client.DONE) {
      t.step(function() {
        assert_true(client.status != 299, "req " + id + " server says: " + client.responseText)
      })
      ready(client)
    }
  }
  return client
}

/*
 * Make two requests to test cache behaviour.
 * The second is made after the first is done and a delay, to make sure it gets into cache.
 */
function two_reqs(id1, id2, should_have_same_body, t, done) {
  var rand = Date.now()
  var url = CROSSDOMAIN + 'resources/304.py?id=' + id1 + '&r=%s' + rand

  var client1 = req(url, id1, t, function(client1) {
    t.step(function() {
      assert_equals(client1.response, "Success", "didn't get successful 1st response;")
      assert_equals(client1.getResponseHeader(state_header), id1, "1st response didn't come from server;")
    })

    t.step_timeout(function() {
      req(url, id2, t, function(client2) {
        t.step(function() {
          if (should_have_same_body) {
            assert_equals(client1.response, client2.response, "response bodies were different;")
//            var res_id2 = client2.getResponseHeader(state_header)
//            assert_not_equals(res_id2, id1, "2nd response doesn't appear to have updated cached headers;")
//            assert_not_equals(res_id2, null, "2nd response didn't expose request identifier;")
//            assert_equals(res_id2, id2, "2nd response is associated with a different request (!);")
          }
          done(client1, client2)
        })
        t.done()
      })
    }, 5000)
  })
}

async_test(function(t) {
  two_reqs('1', '2', true, t, function(client1, client2) {
    assert_equals(client1.getResponseHeader("A"), null, "'A' header exposed without permission;")
  })
}, "A 304 response with no CORS headers inherits from the stored response")

async_test(function(t) {
  two_reqs('3', '4', true, t, function(client1, client2) {
    assert_equals(client2.getResponseHeader("A"), "4", "304 didn't expose 'A' header, even though allowed;")
    assert_equals(client2.getResponseHeader("B"), "4", "304 didn't expose 'B' header even though allowed;")
  })
}, "A 304 can expand Access-Control-Expose-Headers")

async_test(function(t) {
  two_reqs('5', '6', true, t, function(client1, client2) {
    assert_equals(client2.getResponseHeader("B"), null, "2nd 304 exposed 'B' header;")
  })
}, "A 304 can contract Access-Control-Expose-Headers")

async_test(function(t) {
  two_reqs('7', '8', false, t, function(client1, client2) {
    assert_not_equals(client1.response, client2.response, "Access granted even though 304 updated it to disallow;")
  })
}, "A 304 can change Access-Control-Allow-Origin")


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