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June 26, 2024 02:42
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PPR w/ CF Pages and HTMLRewriter
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| // functions/index.js | |
| export async function onRequestGet({ request, env }) { | |
| // Start getting something from "the DB" | |
| const dbPromise = scheduler.wait(1000).then(() => new Date().toDateString()); | |
| // Fetch index.html from cache (body will stream below) | |
| const staticShell = await env.ASSETS.fetch(request); | |
| // The browser will immediately render up until the body closing tag, | |
| // then we insert dom modification scripts as the data is resolved | |
| return new HTMLRewriter() | |
| .on('body', { | |
| element(e) { | |
| e.onEndTag(async (tag) => { | |
| const data = await dbPromise; | |
| tag | |
| .before('<template id="date-tpl">', { html: true }) | |
| .before(data) | |
| .before('</template>', { html: true }) | |
| .before( | |
| `<script> | |
| document.getElementById("date").replaceChildren( | |
| document.getElementById("date-tpl").content) | |
| </script>`, | |
| { html: true } | |
| ); | |
| }); | |
| }, | |
| }) | |
| .transform( | |
| new Response(staticShell.body, { | |
| headers: { 'content-type': 'text/html; charset=utf-8' }, | |
| }) | |
| ); | |
| } |
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| <!-- static/index.html --> | |
| <html> | |
| <body> | |
| <p>Today is: <span id="date">Loading...</span></p> | |
| </body> | |
| </html> |
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| #:schema node_modules/wrangler/config-schema.json | |
| name = "pages-ppr" | |
| pages_build_output_dir = "./static" | |
| compatibility_date = "2024-05-12" |
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To deploy:
To develop locally (may have issues with streaming unless you turn gzip off – so use curl to verify):