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- +++
- title = "JIT Requests"
- description = "Maximize resources while minimizing external requests."
- categories = ["experience"]
- tags = ["performance", "styles", "javascript"]
- features = ["related content", "snippets", "code highlighter"]
- [[copyright]]
- owner = "Josh Habdas"
- date = "2019"
- license = "agpl-3.0-or-later"
- +++
-
- After Dark makes <abbr title="Just-In-Time">JIT</abbr> requests for some external assets to cut down on resource consumption and increase page performance.
-
- Take the [Code Highlighter](../code-highlighter) stylesheet for example:
-
- {{< highlight css >}}
- {{< include "themes/after-dark/static/css/syntax.css" >}}
- {{< /highlight >}}
-
- The stylesheet code shown above is itself highlighted using a JIT request. Confirm by viewing the network requests for this page and observe the `fetch` request for the `syntax.css` file as depicted here:
-
- ```sh
- jit-requests (document)
- ├── lazysizes.min.js (fetch)
- ├── syntax.css (fetch)
- ```
-
- Using [Fetch Injection](../fetch-injection) a JIT request is issued to begin downloading the highlighter stylesheet on-the-fly in parallel with other resources and the base layout takes care to ensure the CSS is only requested on pages that need it.
-
- Create your own JIT requests using [Custom Layout](../custom-layouts) and [Fetch Injection](../fetch-injection).
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