Content-Security-Policy: prefetch-src directive
The HTTP Content-Security-Policy (CSP)
prefetch-src directive specifies valid resources that may
be prefetched or prerendered.
| CSP version | 3 |
|---|---|
| Directive type | [Fetch directive](https://developer.mozilla.org/en-US/docs/Glossary/Fetch%20directive) |
| [default-src](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/default-src) fallback |
Yes. If this directive is absent, the user agent will look for the
default-src directive.
|
Syntax
Content-Security-Policy: prefetch-src 'none';
Content-Security-Policy: prefetch-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:
Example
Prefetch resources do not match header
Given a page with the following Content Security Policy:
Content-Security-Policy: prefetch-src https://example.com/
Fetches for the following code will return network errors, as the URLs provided do not
match prefetch-src's source list:
<link rel="prefetch" href="https://example.org/" />
<link rel="prerender" href="https://example.org/" />
Specifications
Browser compatibility
See also
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