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<!DOCTYPE html>
<meta charset="utf-8">
<title>respondWith streams data to an intercepted fetch()</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/test-helpers.sub.js"></script>
<script>
'use strict';
const WORKER =
'resources/fetch-event-respond-with-partial-stream-worker.js';
const SCOPE =
'resources/fetch-event-respond-with-partial-stream-iframe.html';
promise_test(async t => {
let reg = await service_worker_unregister_and_register(t, WORKER, SCOPE)
add_completion_callback(() => reg.unregister());
await wait_for_state(t, reg.installing, 'activated');
let frame = await with_iframe(SCOPE);
t.add_cleanup(_ => frame.remove());
let response = await frame.contentWindow.fetch('partial-stream.txt');
let reader = response.body.getReader();
let encoder = new TextEncoder();
let decoder = new TextDecoder();
let expected = 'partial-stream-content';
let encodedExpected = encoder.encode(expected);
let received = '';
let encodedReceivedLength = 0;
// Accumulate response data from the service worker. We do this as a loop
// to allow the browser the flexibility of rebuffering if it chooses. We
// do expect to get the partial data within the test timeout period, though.
// The spec is a bit vague at the moment about this, but it seems reasonable
// that the browser should not stall the response stream when the service
// worker has only written a partial result, but not closed the stream.
while (encodedReceivedLength < encodedExpected.length) {
let chunk = await reader.read();
assert_false(chunk.done, 'partial body stream should not be closed yet');
encodedReceivedLength += chunk.value.length;
received += decoder.decode(chunk.value);
}
// Note, the spec may allow some re-buffering between the service worker
// and the outer intercepted fetch. We could relax this exact chunk value
// match if necessary. The goal, though, is to ensure the outer fetch is
// not completely blocked until the service worker body is closed.
assert_equals(received, expected,
'should receive partial content through service worker interception');
reg.active.postMessage('done');
await reader.closed;
}, 'respondWith() streams data to an intercepted fetch()');
</script>
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