mozilla-central/testing/web-platform/tests/fetch/api/request/request-keepalive-quota.html

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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Request Keepalive Quota Tests</title>
<meta name="timeout" content="long">
<meta name="help" href="https://fetch.spec.whatwg.org/#request">
<meta name="help" href="https://fetch.spec.whatwg.org/#body-mixin">
<meta name="author" title="Microsoft Edge" href="https://www.microsoft.com">
<meta name="variant" content="?include=fast">
<meta name="variant" content="?include=slow-1">
<meta name="variant" content="?include=slow-2">
<meta name="variant" content="?include=slow-3">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/subset-tests-by-key.js"></script>
</head>
<body>
<script>
'use strict';
// We want to ensure that our keepalive requests hang slightly before completing so we can validate
// the effects of a rolling quota. To do this we will utilize trickle.py with a 1s delay. This should
// prevent any of the Fetch's from finishing in this window.
const trickleURL = '../resources/trickle.py?count=1&ms=';
const noDelay = 0;
const standardDelay = 1000;
function wait(ms) {
return new Promise(resolve => step_timeout(resolve, ms));
}
// We should expect 64KiB of rolling quota for any type of keep-alive request sent.
const expectedQuota = 65536;
function fetchKeepAliveRequest(delay, bodySize) {
// Create a body of the specified size that's filled with *'s
const body = '*'.repeat(bodySize);
return fetch(trickleURL + delay, {keepalive: true, body, method: 'POST'}).then(res => {
return res.text();
}).then(() => {
return wait(1);
});
}
// Test 1 Byte
subsetTestByKey("fast", promise_test, function(test) {
return fetchKeepAliveRequest(noDelay, 1 /* bodySize */);
}, 'A Keep-Alive fetch() with a small body should succeed.');
// Test Quota full limit
subsetTestByKey("fast", promise_test, function(test) {
return fetchKeepAliveRequest(noDelay, expectedQuota /* bodySize */);
}, 'A Keep-Alive fetch() with a body at the Quota Limit should succeed.');
// Test Quota + 1 Byte
subsetTestByKey("fast", promise_test, function(test) {
return promise_rejects_js(test, TypeError, fetchKeepAliveRequest(noDelay, expectedQuota + 1));
}, 'A Keep-Alive fetch() with a body over the Quota Limit should reject.');
// Test the Quota becomes available upon promise completion.
subsetTestByKey("slow-1", promise_test, function (test) {
// Fill our Quota then try to send a second fetch.
return fetchKeepAliveRequest(standardDelay, expectedQuota).then(() => {
// Now validate that we can send another Keep-Alive fetch for the full size of the quota.
return fetchKeepAliveRequest(noDelay, expectedQuota);
});
}, 'A Keep-Alive fetch() should return its allocated Quota upon promise resolution.');
// Ensure only the correct amount of Quota becomes available when a fetch completes.
subsetTestByKey("slow-2", promise_test, function(test) {
// Create a fetch that uses all but 1 Byte of the Quota and runs for 2x as long as the other requests.
const first = fetchKeepAliveRequest(standardDelay * 2, expectedQuota - 1);
// Now create a single Byte request that will complete quicker.
const second = fetchKeepAliveRequest(standardDelay, 1 /* bodySize */).then(() => {
// We shouldn't be able to create a 2 Byte request right now as only 1 Byte should have freed up.
return promise_rejects_js(test, TypeError, fetchKeepAliveRequest(noDelay, 2 /* bodySize */));
}).then(() => {
// Now validate that we can send another Keep-Alive fetch for just 1 Byte.
return fetchKeepAliveRequest(noDelay, 1 /* bodySize */);
});
return Promise.all([first, second]);
}, 'A Keep-Alive fetch() should return only its allocated Quota upon promise resolution.');
// Test rejecting a fetch() after the quota is used up.
subsetTestByKey("slow-3", promise_test, function (test) {
// Fill our Quota then try to send a second fetch.
const p = fetchKeepAliveRequest(standardDelay, expectedQuota);
const q = promise_rejects_js(test, TypeError, fetchKeepAliveRequest(noDelay, 1 /* bodySize */));
return Promise.all([p, q]);
}, 'A Keep-Alive fetch() should not be allowed if the Quota is used up.');
</script>
</body>
</html>