Baseline Widely available
The HTTP Content-Security-Policy (CSP) worker-src directive specifies valid sources for Worker, SharedWorker, or ServiceWorker scripts.
If this directive is absent, the user agent will first look for the child-src directive, then the script-src directive, then finally for the default-src directive, when governing worker execution.
Content-Security-Policy: worker-src 'none';
Content-Security-Policy: worker-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:
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:text/javascript,â¦");
blockedWorker = new SharedWorker("https://not-example.com/");
navigator.serviceWorker.register("https://not-example.com/sw.js");
</script>
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