Website readiness profile · Snapshot 23 October 2026
onlinegdb.com
onlinegdb.com's public homepage, certificate and DNS checked against 31 practices and compared with 231 Programming & Software sites.
- Readiness index
- 65/100
- Ahead of
- 42%
- Practices observed
- 16/29
- Popularity band
- Top 50K
Programming & Software median 68
of measured Programming & Software sites
2 of 31 could not be measured
Chrome UX Report top-sites list
Readiness by lane
Green: onlinegdb.com. Thin bar: Programming & Software peer median.
Enable
67/100
Peers 81
Harden
58/100
Peers 59
Accelerate
83/100
Peers 65
Recover
0/100
Peers 7
Priority fixes for onlinegdb.com
Ordered by impact and by how common each practice is among peers.
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.
On Cloudflare: Enable HSTS under SSL/TLS > Edge Certificates > HTTP Strict Transport Security and raise max-age gradually.
40% of Programming & Software peers do this. Limit: Read from the homepage response only; other pages or regions may send different headers.
Priority 2 · Accelerate
No render-blocking scripts in <head>
Observed: The homepage <head> loaded 8 external scripts without async or defer.
What to do: Add defer to scripts that need the DOM, async to independent ones such as analytics, or move them to the end of the body.
51% of Programming & Software peers do this.
Guide: Control Third-Party Scripts Before They Control Your Page
Priority 3 · Enable
Canonical URL declared
Observed: The homepage did not declare a canonical URL.
What to do: Add a self-referencing canonical link to every indexable page, using the final https:// URL.
74% of Programming & Software peers do this.
Priority 4 · Enable
Page language declared
Observed: The homepage <html> element had no lang attribute.
What to do: Set lang on the html element (for example lang="en") and on any sections in another language.
90% of Programming & Software peers do this.
What onlinegdb.com already does well
Practices fewer than half of Programming & Software peers use.
- CAA records limit who can issue certificatesCAA limits issuance to comodoca.com, digicert.com, letsencrypt.org and others.23% of peers
- HTTP/3 advertisedHTTP/3 advertised.40% of peers
- DMARC policy enforces quarantine or rejectDMARC policy p=reject.45% of peers
What we saw
- Homepage checked
- https://www.onlinegdb.com/
- Homepage response
- HTTP 200
- TLS
- TLSv1.3, HTTP/2
- Certificate
- Google Trust Services, 90-day validity, expiring 2027-01-02
- CDN or edge
- Cloudflare
- DNS operators
- Cloudflare
- DMARC policy
- p=reject
- Homepage HTML
- 89 KB, br
- Images on homepage
- 2 (gif 1)
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 13
- HSTS kept for at least a year
- DNSSEC signed
- security.txt published
- X-Content-Type-Options: nosniff
- Framing restricted
- Content Security Policy present
- Referrer-Policy set
- No render-blocking scripts in <head>
- Canonical URL declared
- Structured data present
- Social preview image set
- Page language declared
- Nameservers spread across providers
Observed 16
- HTTP requests move to HTTPS
- TLS 1.3 negotiated
- Certificate has more than 14 days left
- Certificate lifetime of 100 days or less
- CAA records limit who can issue certificates
- DMARC policy enforces quarantine or reject
- HTTP/2 negotiated
- HTTP/3 advertised
- HTML compressed
- Static files cached for 30 days or more
- robots.txt published
- XML sitemap discoverable
- Reachable over IPv6
- Meta description written
- Mobile viewport configured
- At most one redirect to the homepage
Not measured 2
- Modern image formats in use
- Offscreen images lazy-loaded
Own onlinegdb.com?
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Live status for this site: Status Is Down: onlinegdb.com. This profile covers configuration only.