utilization reduction

src/components/EdgeCacheHeaders.tsx

@@ -0,0 +1,29 @@
+import { HttpHeader } from "@solidjs/start";
+
+/**
+ * Renders edge-cache response headers for a page route.
+ *
+ * Sets `CDN-Cache-Control` so Vercel serves the rendered HTML from the edge
+ * (no origin re-render) for `maxAge` seconds, then stale-while-revalidate up
+ * to `staleSeconds`. `Cache-Control: public, max-age=0` keeps browsers
+ * revalidating, so visitors always get the latest version — only the CDN
+ * holds a cached copy. Function/CND-Cache-Control overrides the Vercel
+ * default, so repeated visits and bot crawls stop re-rendering at origin.
+ */
+export function EdgeCacheHeaders(props: {
+ /** Seconds the CDN may serve the response fresh. */
+ maxAge: number;
+ /** Seconds the CDN serves stale while revalidating (default: 1 day). */
+ staleSeconds?: number;
+}) {
+ const stale = props.staleSeconds ?? 86400;
+ return (
+  <>
+   <HttpHeader name="Cache-Control" value="public, max-age=0" />
+   <HttpHeader
+    name="CDN-Cache-Control"
+    value={`public, s-maxage=${props.maxAge}, stale-while-revalidate=${stale}`}
+   />
+  </>
+ );
+}