Leonora Tindall
6 months ago
5 changed files with 80 additions and 2 deletions
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# About the Author |
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This very silly application was written by Leonora Tindall. |
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You can find her other work at [nora.codes](https://nora.codes), |
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or find her on [Twitter](https://twitter.com/NoraDotCodes) |
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and on the Fediverse at [Weirder Earth](https://weirder.earth/@noracodes). |
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Thanks for visiting! |
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<!--[if IE]><meta http-equiv="X-UA-Compatible" content="IE=5,IE=9" ><![endif]--> |
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<!DOCTYPE html> |
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<html> |
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<head> |
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<title>with_cache</title> |
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<meta charset="utf-8"/> |
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</head> |
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<body><div class="mxgraph" style="max-width:100%;border:1px solid transparent;" data-mxgraph="{"highlight":"#0000ff","nav":true,"resize":true,"toolbar":"zoom layers tags lightbox","edit":"_blank","xml":"<mxfile host=\"app.diagrams.net\" modified=\"2022-09-20T15:36:42.143Z\" agent=\"5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36\" etag=\"m59Sz5y0B9XURcQJF8E1\" version=\"20.3.1\" type=\"device\"><diagram id=\"Xpad1kBT1G1nm2uLucKE\" name=\"Page-1\">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</diagram></mxfile>"}"></div> |
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<script type="text/javascript" src="https://viewer.diagrams.net/js/viewer-static.min.js"></script> |
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</body> |
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</html> |
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After Width: | Height: | Size: 61 KiB |
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### What? |
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This page is written in Markdown (actually in three Markdown files). |
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These Markdown files are requested by Fastly's Compute@Edge engine and rendered into |
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HTML at the edge, on every request. |
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You can check out the source code [here](https://git.nora.codes/nora/edgeblog). |
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The only dependency of the service, other than the Fastly SDK, |
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is Raph Levien's [`pulldown-cmark`][pulldown_cmark]. |
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It's not an optimal choice, as it only supports one-shot rendering and requires buffering |
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the Markdown (though not the resulting HTML) in memory, but it's the best option available |
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at the moment. |
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[pulldown_cmark]: https://github.com/raphlinus/pulldown-cmark |
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[](images/diagram.html) |
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The renderer takes advantage of the fact that Markdown allows embedding raw HTML by embedding |
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anything with a "text" MIME type in the Markdown source, while passing through anything |
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without a "text" MIME type - images, binary data, and so forth - unchanged. |
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That allows the above JPG image to embed properly, while also allowing the linked SVG image page |
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to be rendered as a component of a Markdown document. |
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### Why? |
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I work on the Compute@Edge platform and wanted to get some hands on experience with it. |
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This is not a good use of the platform for various reasons; among other things, |
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it buffers all page content in memory for every request, which is ridiculous. |
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A static site generator like [Hugo][hugo] or [Zola][zola] is an objectively better choice |
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for bulk rendering, while the C@E layer is better for filtering, editing, and dynamic content. |
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[hugo]: https://gohugo.io/ |
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[zola]: https://www.getzola.org/ |
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That said, this does demonstrate some interesting properties of the C@E platform. |
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For instance, the source files are hosted in [a subdirectory][source] of my webserver; |
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in theory, you could directory-traverse your way into my blog source, but in fact, |
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you can't. |
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[source]: https://nora.codes/edgeblog/ |
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I also have a [Clacks Overhead][clacks] set for my webserver, and the C@E platform |
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is set up to make passing through existing headers trivial even with entirely |
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synthetic responses like these, so that header is preserved. |
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[clacks]: https://xclacksoverhead.org/home/about |
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