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sync-xhr
The sync-xhr policy controls whether synchronous requests can be made through the XMLHttpRequest API.
If disallowed in a document, then calls to send()
on XMLHttpRequest objects with the synchronous flag set will fail, causing
a NetworkError DOMException to be thrown.
How to apply this policy
Send the following HTTP header to control the sync-xhr policy, and disallow
it on all origins:
Feature-Policy: sync-xhr 'none'Affected use case example
JavaScript
const xhr = new XMLHttpRequest();
xhr.open('GET', '/test-assets/simple-text.txt', false); // sync
xhr.send();
document.body.innerHTML = xhr.response;
DemoUtils.reportDemoResult(true);Output
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Does it work?
Currently Firefox, and Chromium based browsers, such as Google Chrome, Samsung Internet,
and Opera, are the only user-agents to support Feature Policy. The minimum version that
correctly recognises the sync-xhr policy is:
Not supported
65+
Not supported
Not supported