gutenberg.org

Readiness by lane

Green: gutenberg.org. Thin bar: Literary & Knowledge peer median.

Priority fixes for gutenberg.org

Ordered by impact and by how common each practice is among peers.

1. Priority 1 · Enable

   XML sitemap discoverable

   Observed: No sitemap was listed in robots.txt or found at /sitemap.xml.

   Why it matters: A sitemap helps search engines find new and updated pages, especially on large or frequently updated sites.

   What to do: Generate an XML sitemap of canonical URLs, reference it in robots.txt and submit it in Google Search Console.

   69% of Literary & Knowledge peers do this. Limit: Only the standard location was requested, once, at the time of the check.

   Guide: XML Sitemap Guide: Include Only URLs You Stand Behind

2. Priority 2 · Accelerate

   Static files cached for 30 days or more

   Observed: A same-site stylesheet or script was cacheable for no max-age, short of the 30-day benchmark.

   What to do: Give versioned (fingerprinted) CSS, JavaScript, fonts and images Cache-Control: public, max-age=31536000, immutable, and change the file name whenever the content changes.

   49% of Literary & Knowledge peers do this.

   Guide: Browser Caching Guide for Website Owners

3. Priority 3 · Harden

   HSTS kept for at least a year

   Observed: Strict-Transport-Security was sent with a max-age of 90 days, below the one-year benchmark.

   What to do: Send Strict-Transport-Security on HTTPS responses. Start with a short max-age (for example 300 seconds), confirm every subdomain works over HTTPS, then raise it in steps to 31536000. Add includeSubDomains only when all subdomains are HTTPS. HSTS preload is optional and hard to undo; hstspreload.org itself does not recommend it by default.

   28% of Literary & Knowledge peers do this.

   Guide: HTTPS and TLS Guide for Website Owners

4. Priority 4 · Accelerate

   Modern image formats in use

   Observed: The homepage had 28 images and none used WebP or AVIF.

   What to do: Serve WebP or AVIF with a JPEG or PNG fallback, either through an image CDN or by generating both formats at build time.

   31% of Literary & Knowledge peers do this.

   Guide: AVIF, WebP, JPEG, and PNG: Choose the Right Image Format

What gutenberg.org already does well

Practices fewer than half of Literary & Knowledge peers use.

• No render-blocking scripts in <head>Head scripts load without blocking.48% of peers

What we saw

Homepage checked

https://www.gutenberg.org/

Homepage response

HTTP 200

TLS

TLSv1.3, HTTP/2

Certificate

SSL Corporation, 198-day validity, expiring 2027-05-04

DNS operators

1 self-run or other nameserver domain

HSTS

max-age 90 days, includeSubDomains

Homepage HTML

30 KB, gzip

Images on homepage

28 (jpg 21, png 7)

Limits: homepage only, one location, one moment. Header checks reflect the homepage response; other pages may differ.

Stack and providers

Seen in the homepage response, certificate and DNS. Provider pages compare how their customers configure the same checks.

All 31 checks

Select a gap for the method and fix. How each check works

Compare with other Literary & Knowledge sites

• boylove.cc52
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• elibro.net52
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• rhymezone.com52

Literary & Knowledge readiness benchmark