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perf(assets): compress asciicast responses #839

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Merged
ss-o merged 1 commit into from
Aug 14, 2026
+17 −8
Merged

perf(assets): compress asciicast responses #839

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25 changes: 17 additions & 8 deletions functions/[[path]].ts
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Original file line number Diff line number Diff line change
Expand Up @@ -6,11 +6,20 @@ interface Env {
}

const immutableAssetPrefixes = ["/assets/", "/cdn/", "/img/"];
const asciicastContentType = "text/plain; charset=utf-8";
const {contentSignal} = contentPolicy;

function withContentSignal(response: Response): Response {
const headers = new Headers(response.headers);
function applyContentHeaders(headers: Headers, pathname?: string): void {
headers.set("Content-Signal", contentSignal);
// Cloudflare compresses text/plain responses, unlike the default application/octet-stream used for .cast files.
if (pathname?.endsWith(".cast")) {
headers.set("Content-Type", asciicastContentType);
}
}

function withContentHeaders(response: Response, pathname?: string): Response {
const headers = new Headers(response.headers);
applyContentHeaders(headers, pathname);
return new Response(response.body, {
status: response.status,
statusText: response.statusText,
Expand All @@ -32,20 +41,20 @@ export const onRequest: PagesFunction<Env> = async (context) => {
});
}

const url = new URL(context.request.url);
const response = await context.next();
if (response.status !== 404) {
return withContentSignal(response);
return withContentHeaders(response, url.pathname);
}

if (context.request.method !== "GET" && context.request.method !== "HEAD") {
return withContentSignal(response);
return withContentHeaders(response);
}

const url = new URL(context.request.url);
const key = url.pathname.slice(1);

if (!key) {
return withContentSignal(response);
return withContentHeaders(response);
}

// Honor the conditional (If-None-Match) and Range request headers advertised
Expand All @@ -56,7 +65,7 @@ export const onRequest: PagesFunction<Env> = async (context) => {
});

if (!object) {
return withContentSignal(response);
return withContentHeaders(response);
}

const headers = new Headers();
Expand All @@ -69,7 +78,7 @@ export const onRequest: PagesFunction<Env> = async (context) => {
headers.set("ETag", object.httpEtag);
headers.set("Access-Control-Allow-Origin", "*");
headers.set("Accept-Ranges", "bytes");
headers.set("Content-Signal", contentSignal);
applyContentHeaders(headers, url.pathname);
if (url.pathname.startsWith("/cdn/")) {
headers.set("X-Robots-Tag", "noindex, noarchive");
}
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