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CSP: block-all-mixed-content

The HTTP Content-Security-Policy (CSP) block-all-mixed-content directive prevents loading any assets using HTTP when the page is loaded using HTTPS.

All mixed content resource requests are blocked, including both active and passive mixed content. This also applies to <iframe> documents, ensuring the entire page is mixed content free.

The upgrade-insecure-requests directive is evaluated before block-all-mixed-content and If the former is set, the latter is effectively a no-op. It is recommended to set one directive or the other – not both.

Syntax

Content-Security-Policy: block-all-mixed-content;

Examples

Content-Security-Policy: block-all-mixed-content;

<meta http-equiv="Content-Security-Policy" content="block-all-mixed-content">

To disallow http assets on a more granular level, you can also set individual directives to "https:". For example, to disallow insecure http images:

Content-Security-Policy: img-src https:

Specifications

Specification Status Comment
Mixed Content
The definition of 'block-all-mixed-content' in that specification.
Candidate Recommendation Initial definition.

Browser compatibility

Feature Chrome Firefox Edge Internet Explorer Opera Safari
Basic Support (Yes) 48.0 ? (No) (Yes) ?
Feature Android Chrome for Android Edge mobile Firefox for Android IE mobile Opera Android iOS Safari
Basic Support ? (Yes) ? 48.0 (No) ? ?

See also

© 2005–2017 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/block-all-mixed-content