Website readiness profile · Snapshot 23 October 2026
offerup.com
offerup.com's public homepage, certificate and DNS checked against 31 practices and compared with 5,718 E-Commerce & Marketplaces sites.
- Readiness index
- 79/100
- Ahead of
- 81%
- Practices observed
- 24/31
- Popularity band
- Top 50K
E-Commerce & Marketplaces median 71
of measured E-Commerce & Marketplaces sites
0 of 31 could not be measured
Chrome UX Report top-sites list
Readiness by lane
Green: offerup.com. Thin bar: E-Commerce & Marketplaces peer median.
Enable
95/100
Peers 86
Harden
77/100
Peers 60
Accelerate
73/100
Peers 69
Recover
0/100
Peers 11
Priority fixes for offerup.com
Ordered by impact and by how common each practice is among peers.
Priority 1 · Accelerate
HTTP/2 negotiated
Observed: The TLS handshake selected http/1.1 instead of HTTP/2.
Why it matters: HTTP/2 sends many files over one connection, which speeds up pages with lots of images, styles and scripts.
What to do: Enable HTTP/2 on your CDN or server. Most CDNs do this by default.
94% of E-Commerce & Marketplaces peers do this. Limit: Certificate and protocol were observed from one vantage point; CDNs can present different certificates by region.
Priority 2 · Harden
HSTS kept for at least a year
Observed: Strict-Transport-Security was sent with a max-age of 30 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.
On Cloudflare: Enable HSTS under SSL/TLS > Edge Certificates > HTTP Strict Transport Security and raise max-age gradually.
32% of E-Commerce & Marketplaces peers do this.
Priority 3 · Accelerate
HTTP/3 advertised
Observed: The homepage did not advertise HTTP/3 through an Alt-Svc header.
What to do: Turn on HTTP/3 at your CDN. Browsers fall back to HTTP/2 automatically, so the risk is low.
On Cloudflare: Enable HTTP/3 (with QUIC) under Speed > Optimization > Protocol Optimization.
47% of E-Commerce & Marketplaces peers do this.
Priority 4 · Harden
CAA records limit who can issue certificates
Observed: No CAA record was found for offerup.com, so any public certificate authority may issue for it.
What to do: Publish CAA records naming every CA you actually use, including the CAs your CDN uses for managed certificates. Add an iodef contact if you want reports.
On Cloudflare: Cloudflare documents which CAs its managed certificates need; include them in your CAA records.
16% of E-Commerce & Marketplaces peers do this.
What offerup.com already does well
Practices fewer than half of E-Commerce & Marketplaces peers use.
- DNSSEC signedDNSSEC delegation (DS record) present.7.7% of peers
- Referrer-Policy setReferrer-Policy present.20% of peers
- DMARC policy enforces quarantine or rejectDMARC policy p=reject.39% of peers
What we saw
- Homepage checked
- https://offerup.com/
- Homepage response
- HTTP 200
- TLS
- TLSv1.3, http/1.1
- Certificate
- Google Trust Services, 90-day validity, expiring 2026-12-18
- CDN or edge
- Cloudflare
- Platform or framework
- Next.js
- DNS operators
- Cloudflare
- HSTS
- max-age 30 days
- DMARC policy
- p=reject
- Homepage HTML
- 219 KB, gzip
- Images on homepage
- 9 (webp 6, png 3)
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
Not observed 7
Observed 24
- HTTP requests move to HTTPS
- TLS 1.3 negotiated
- Certificate has more than 14 days left
- Certificate lifetime of 100 days or less
- DNSSEC signed
- DMARC policy enforces quarantine or reject
- X-Content-Type-Options: nosniff
- Framing restricted
- Content Security Policy present
- Referrer-Policy set
- HTML compressed
- Static files cached for 30 days or more
- Modern image formats in use
- Offscreen images lazy-loaded
- No render-blocking scripts in <head>
- robots.txt published
- XML sitemap discoverable
- Canonical URL declared
- Meta description written
- Mobile viewport configured
- Structured data present
- Social preview image set
- Page language declared
- At most one redirect to the homepage
Own offerup.com?
Re-run the checks after a change, or verify the site in a free workspace to save reports with history, compare against similar sites and competitors, and track a private action plan. What owners get.
Live status for this site: Status Is Down: offerup.com. This profile covers configuration only.