Function fetch

pollinations.ai/src/worker.ts:91–163

(request: Request, env: Env)

export default {
    async fetch(request: Request, env: Env): Promise<Response> {
        const url = new URL(request.url);

        // Serve static assets with per-route meta tag rewriting for SEO
        const response = await env.ASSETS.fetch(request);

        // Only rewrite HTML responses (SPA pages, not JS/CSS/images)
        const contentType = response.headers.get("content-type") || "";
        if (!contentType.includes("text/html")) {
            return response;
        }

        const path = url.pathname === "" ? "/" : url.pathname;
        // Normalize: strip trailing slash (except root)
        const normalizedPath =
            path !== "/" && path.endsWith("/") ? path.slice(0, -1) : path;
        const meta = ROUTE_META[normalizedPath] || ROUTE_META["/"];
        const canonical = `https://pollinations.ai${normalizedPath === "/" ? "" : normalizedPath}`;
        const jsonLd = getJsonLd(normalizedPath);

        return new HTMLRewriter()
            .on("title", {
                element(el) {
                    el.setInnerContent(meta.title);
                },
            })
            .on('link[rel="canonical"]', {
                element(el) {
                    el.setAttribute("href", canonical);
                },
            })
            .on('meta[name="description"]', {
                element(el) {
                    el.setAttribute("content", meta.description);
                },
            })
            .on('meta[property="og:title"]', {
                element(el) {
                    el.setAttribute("content", meta.title);
                },
            })
            .on('meta[property="og:description"]', {
                element(el) {
                    el.setAttribute("content", meta.description);
                },
            })
            .on('meta[property="og:url"]', {
                element(el) {
                    el.setAttribute("content", canonical);
                },
            })
            .on('meta[name="twitter:title"]', {
                element(el) {
                    el.setAttribute("content", meta.title);
                },
            })
            .on('meta[name="twitter:description"]', {
                element(el) {