The HTTP Content-Security-Policy (CSP) worker-src directive specifies valid sources for Worker, SharedWorker, or ServiceWorker scripts.
| CSP version | 3 |
|---|---|
| Directive type | Fetch directive |
| Fallback | If this directive is absent, the user agent will first look for the |
One or more sources can be allowed for the worker-src policy:
Content-Security-Policy: worker-src <source>;
Content-Security-Policy: worker-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:
Content-Security-Policy: worker-src https://example.com/
Worker, SharedWorker, ServiceWorker are blocked and won't load:
<script>
let blockedWorker = new Worker("data:application/javascript,…");
blockedWorker = new SharedWorker("https://not-example.com/");
navigator.serviceWorker.register("https://not-example.com/sw.js");
</script>
| Specification |
|---|
| Content Security Policy Level 3 # directive-worker-src |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
worker-src |
59
Chrome 59 and higher skips the deprecated child-src directive.
|
79
|
58
|
No
|
46
Opera 46 and higher skips the deprecated child-src directive.
|
15.5
|
59
Chrome 59 and higher skips the deprecated child-src directive.
|
59
Chrome 59 and higher skips the deprecated child-src directive.
|
58
|
43
Opera 43 and higher skips the deprecated child-src directive.
|
15.5
|
7.0
|
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https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/worker-src