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Showing content from https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/img-src below:

CSP: img-src - HTTP | MDN

CSP: img-src

Baseline Widely available

The HTTP Content-Security-Policy img-src directive specifies valid sources of images and favicons.

CSP version 1 Directive type Fetch directive default-src fallback Yes. If this directive is absent, the user agent will look for the default-src directive. Syntax
Content-Security-Policy: img-src 'none';
Content-Security-Policy: img-src <source-expression-list>;

This directive may have one of the following values:

'none'

No resources of this type may be loaded. The single quotes are mandatory.

<source-expression-list>

A space-separated list of source expression values. Resources of this type may be loaded if they match any of the given source expressions. For this directive, the following source expression values are applicable:

Examples Violation cases

Given this CSP header:

Content-Security-Policy: img-src https://example.com/

The following <img> is blocked and won't load:

<img src="https://not-example.com/foo.jpg" alt="example picture" />
Specifications Browser compatibility See also

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