gecko-dev/testing/web-platform/tests/XMLHttpRequest/response-data-gzip.htm

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<!doctype html>
<html>
<head>
<title>XMLHttpRequest: GZIP response was correctly inflated</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="help" href="https://dvcs.w3.org/hg/xhr/raw-file/tip/Overview.html#the-send()-method" data-tested-assertations="following::p[contains(text(),'content-encodings')]" />
</head>
<body>
<div id="log"></div>
<script>
function request(input) {
var test = async_test();
test.step(function() {
var client = new XMLHttpRequest()
client.open("POST", "resources/gzip.py", false);
client.onreadystatechange = test.step_func(function () {
if (client.readyState === 4) {
var len = parseInt(client.getResponseHeader('content-length'), 10);
assert_equals(client.getResponseHeader('content-encoding'), 'gzip');
assert_true(len < input.length);
assert_equals(client.responseText, input);
test.done();
}
});
client.send(input);
}, document.title);
}
var wellCompressableData = '';
for (var i = 0; i < 500; i++) {
wellCompressableData += 'foofoofoofoofoofoofoo';
}
request(wellCompressableData);
</script>
</body>
</html>