63 lines
2.6 KiB
JavaScript
63 lines
2.6 KiB
JavaScript
// This script is loaded in HTTP and HTTPS contexts to validate
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// PerformanceResourceTiming entries' attributes when reusing connections.
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//
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// Note: to ensure that we reuse the connection to fetch multiple resources, we
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// use the same XMLHttpRequest object throughout an individual test. Although
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// it doesn't seem to be specified, each browser tested by WPT will reuse the
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// underlying TCP connection with this approach. Pre-establishing the XHR's
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// connection helps us to test connection reuse also in browsers that may key
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// their connections on the related request's credentials mode.
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const connection_reuse_test = (path, follow_on_assertions, test_label) => {
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const {on_200, on_304} = follow_on_assertions;
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// Make the first request before calling 'attribute_test' so that only the
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// second request's PerformanceResourceTiming entry will be interrogated. We
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// don't check the first request's PerformanceResourceTiming entry because
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// that's not what this test is trying to validate.
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const client = new XMLHttpRequest();
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const identifier = Math.random();
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path = `${path}?tag=${identifier}`;
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client.open("GET", path, false);
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client.send();
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attribute_test(
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async () => {
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client.open("GET", path + "&same_resource=false", false);
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client.send();
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// We expect to get a 200 Ok response because we've requested a different
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// resource than previous requests.
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if (client.status != 200) {
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throw new Error(`Got something other than a 200 response. ` +
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`client.status: ${client.status}`);
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}
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}, path, entry => {
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invariants.assert_connection_reused(entry);
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on_200(entry);
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},
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`PerformanceResrouceTiming entries need to conform to the spec when a ` +
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`distinct resource is fetched over a persistent connection ` +
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`(${test_label})`);
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attribute_test(
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async () => {
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client.open("GET", path, false);
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client.setRequestHeader("If-None-Match", identifier);
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client.send();
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// We expect to get a 304 Not Modified response because we've used a
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// matching 'identifier' for the If-None-Match header.
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if (client.status != 304) {
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throw new Error(`Got something other than a 304 response. ` +
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`client.status: ${client.status}, response: ` +
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`'${client.responseText}'`);
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}
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}, path, entry => {
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invariants.assert_connection_reused(entry);
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on_304(entry);
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},
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`PerformanceResrouceTiming entries need to conform to the spec when the ` +
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`resource is cache-revalidated over a persistent connection ` +
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`(${test_label})`);
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}
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