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>
An
allowlist
is a list of origins that takes one or more of the following values, separated by spaces:*
: The feature will be allowed in this document, and all nested browsing contexts (iframes) regardless of their origin.'self'
: The feature will be allowed in this document, and in all nested browsing contexts (iframes) in the same origin.'src'
: (In an iframeallow
attribute only) The feature will be allowed in this iframe, as long as the document loaded into it comes from the same origin as the URL in the iframe's src attribute.The'src'
origin is used in the iframeallow
attribute only, and is the defaultallowlist
value.'none'
: The feature is disabled in top-level and nested browsing contexts.- <origin(s)>: The feature is allowed for specific origins (for example, https://example.com). Origins should be separated by a space.
The values
*
(enable for all origins) or'none'
(disable for all origins) may only be used alone, while'self'
and'src'
may be used with one or more origins.Features are each defined to have a default allowlist, which is one of:
*
: The feature is allowed by default in top-level browsing contexts and all nested browsing contexts (iframes).'self'
: The feature is allowed by default in top-level browsing contexts and in nested browsing contexts (iframes) in the same origin. The feature is not allowed in cross-origin documents in nested browsing contexts.'none'
: The feature is disabled in top-level and nested browsing contexts.
Default policy
By default the policy is set to *
, which means synchronous requests are allowed in all frames.
Specifications
Specification | Status | Comment |
---|---|---|
Permissions Policy | Editor's Draft | Initial definition. |
WHATWG Spec | Default policy is * . |
Browser compatibility
BCD tables only load in the browser