archon.pl

Readiness by lane

Green: archon.pl. Thin bar: Real Estate & Property Listings peer median.

Priority fixes for archon.pl

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

1. Priority 1 · Harden

   HSTS kept for at least a year

   Observed: The homepage response did not include a Strict-Transport-Security header.

   Why it matters: HSTS tells browsers to use HTTPS for your host on every later visit, which removes the window where a first HTTP request can be intercepted.

   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.

   43% of Real Estate & Property Listings peers do this. Limit: Read from the homepage response only; other pages or regions may send different headers.

   Guide: HTTPS and TLS Guide for Website Owners

2. Priority 2 · Harden

   Content Security Policy present

   Observed: The homepage response did not include a Content-Security-Policy header.

   What to do: Start with Content-Security-Policy-Report-Only to see what would break, tighten the policy over a few weeks, then enforce it.

   30% of Real Estate & Property Listings peers do this.

   Guide: Payment Security and PCI DSS: What Website Owners Need to Know

3. 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.

   27% of Real Estate & Property Listings peers do this.

   Guide: CDN Guide for Website Owners

4. Priority 4 · Harden

   Certificate lifetime of 100 days or less

   Observed: The certificate from DigiCert Inc had a 198-day validity period, longer than the 100-day maximum that applies from March 2027.

   What to do: Move to automated issuance and renewal now, while you still have time to test it.

   52% of Real Estate & Property Listings peers do this.

   Guide: HTTPS and TLS Guide for Website Owners

What archon.pl already does well

Practices fewer than half of Real Estate & Property Listings peers use.

• CAA records limit who can issue certificatesCAA limits issuance to certum.pl, geotrust.com, letsencrypt.org.6.7% of peers
• DNSSEC signedDNSSEC delegation (DS record) present.11% of peers
• X-Content-Type-Options: nosniffnosniff header present.45% of peers

What we saw

Homepage checked

https://www.archon.pl/

Homepage response

HTTP 200

TLS

TLSv1.3, HTTP/2

Certificate

DigiCert, 198-day validity, expiring 2027-01-08

DNS operators

1 self-run or other nameserver domain

DMARC policy

p=reject

Homepage HTML

245 KB, gzip

Images on homepage

138 (jpg 85, webp 35, png 34, svg 28, gif 4)

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

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Real Estate & Property Listings readiness benchmark