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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, unless you want to force HTTPS on older browsers that do not force it after a redirect to HTTP.

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

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
block-all-mixed-contentChrome Full support YesEdge ? Firefox Full support 48IE No support NoOpera Full support YesSafari ? WebView Android Full support YesChrome Android Full support YesFirefox Android Full support 48Opera Android ? Safari iOS ? Samsung Internet Android Full support Yes

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown

See also

Etiquetas y colaboradores del documento

Colaboradores en esta página: Sheppy, mdnwebdocs-bot, Malvoz, borisschapira, fscholz, teoli
Última actualización por: Sheppy,