Feature-Policy: sync-xhr
Feature-Policy: sync-xhr
Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The HTTP Feature-Policy header sync-xhr directive controls whether the current document is allowed to make synchronous XMLHttpRequest requests.
Syntax
Feature-Policy: sync-xhr <allowlist>;
- <allowlist>
-
A list of origins for which the feature is allowed. See
Feature-Policy.
Default policy
By default the policy is set to *, which means synchronous requests are allowed in all frames.
Browser compatibility
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
sync-xhr |
65 |
79 |
No |
No |
52 |
No |
65 |
65 |
No |
47 |
No |
9.0 |
See also
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https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Feature-Policy/sync-xhr