CSP: img-src

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

One or more sources can be allowed for the img-src policy:

http

Content-Security-Policy: img-src <source>;
Content-Security-Policy: img-src <source> <source>;

<source> can be any one of the values listed in CSP Source Values.

Note that this same set of values can be used in all fetch directives (and a number of other directives).

Given this CSP header:

http

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

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

html

<img src="https://not-example.com/foo.jpg" alt="example picture" />

Specification
Content Security Policy Level 3 # directive-img-src

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