24 lines
1.0 KiB
Markdown
24 lines
1.0 KiB
Markdown
DNS prefetch control header for Express
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=======================================
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[](https://travis-ci.org/helmetjs/dns-prefetch-control)
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[](http://standardjs.com/)
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[_Looking for a changelog?_](https://github.com/helmetjs/helmet/blob/master/HISTORY.md)
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This middleware lets you set the `X-DNS-Prefetch-Control` to control browsers' DNS prefetching. Read more about it [on MDN](https://developer.mozilla.org/en-US/docs/Web/HTTP/Controlling_DNS_prefetching) and [on Chromium's docs](https://dev.chromium.org/developers/design-documents/dns-prefetching).
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Usage:
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```js
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var dnsPrefetchControl = require('dns-prefetch-control')
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// Set X-DNS-Prefetch-Control: off
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app.use(dnsPrefetchControl())
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// Set X-DNS-Prefetch-Control: off
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app.use(dnsPrefetchControl({ allow: false }))
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// Set X-DNS-Prefetch-Control: on
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app.use(dnsPrefetchControl({ allow: true }))
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```
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