Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.BRedirect Chain2 redirect(s), 474 ms totalREVIEW
https://sphinx-doc.org
60 ms · HTTP/1.1
https://www.sphinx-doc.org/
289 ms · HTTP/1.1
https://www.sphinx-doc.org/en/master/
125 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://sphinx-doc.org | 301 | 60 ms | HTTP/1.1 | cloudflare |
| 2 | https://www.sphinx-doc.org/ | 302 | 289 ms | HTTP/1.1 | cloudflare |
| 3 | https://www.sphinx-doc.org/en/master/ | 200 | 125 ms | HTTP/1.1 | cloudflare |
See the visual redirect chain in the HTTP Probe tab →
Each redirect adds latency. Try to minimize the chain to 1 hop.
Redirect chain — each hop adds latency; combine into one redirect where possible.
Source: Google Search Central / web.dev
If permanent, use 301 instead.
302 (Found) is for genuinely temporary redirects — if this redirect is permanent, switch to 301 to preserve SEO equity.
Learn more ▾ ▴
Search engines treat 302 as temporary, keeping the original URL indexed and not transferring full link equity to the destination. Use 301 (Moved Permanently) for permanent redirects (HTTP→HTTPS, www-vs-non-www, URL restructures).
Source: Google Search Central
BURL Variantswww/non-www, trailing slash, HTTP→HTTPSREVIEW
www / non-www
Preferred variant: non-www
HTTP → HTTPS
HTTP version does not redirect to HTTPS
BTLS Certificate Expiry & Recommendations42 days until leaf cert expires — 3 issues to addressREVIEW
Certificate validity
Recommended actions
- Enable HSTS: Strict-Transport-Security: max-age=31536000; includeSubDomains
- Enable DNSSEC on your domain for DNS spoofing protection
- Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
BCDN & DeliveryCloudflareREVIEW
A+DNS Records2 A records, 37 ms lookupPASS
| A | 172.67.166.9, 104.21.11.126 |
| AAAA | 2606:4700:3037::ac43:a609, 2606:4700:3032::6815:b7e |
| CNAME | — |
| NS | terin.ns.cloudflare.com, aurora.ns.cloudflare.com |
| MX | — |
| TXT | — |
| CAA | Lookup not available with standard resolver |
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.
SPF helps prevent email spoofing. Add a TXT record starting with 'v=spf1'.
Without SPF, receiving servers can't validate sending IPs — your domain is easier to spoof in phishing.
Learn more ▾ ▴
SPF complements DMARC. Both should be published. SPF records list authorized sending IPs (e.g., `v=spf1 include:_spf.google.com ~all` for Google Workspace). After publishing, verify in Google Postmaster Tools or mxtoolbox.
Source: RFC 7208 (SPF)
A+IPv6 ReadinessIPv6 reachable (17 ms)PASS
A+Crawlabilityrobots.txt present, sitemap with 1 URLsPASS
# This robots.txt file is autogenerated by Read the Docs.
# It controls the crawling and indexing of your documentation by search engines.
#
# You can learn more about robots.txt, including how to customize it, in our documentation:
#
# * Our documentation on Robots.txt: https://docs.readthedocs.com/platform/stable/reference/robots.html
# * Our guide about SEO techniques: https://docs.readthedocs.com/platform/stable/guides/technical-docs-seo-guide.html
User-agent: *
Disallow: # Allow everything
Sitemap: https://www.sphinx-doc.org/sitemap.xml
A+HTTP Probe TimingTotal 96 ms — DNS, TCP, TLS, TTFB, content transfer breakdownPASS
Connection waterfall
Domain IntelligenceDomain intelligence data not availableINFO
RDAP and WHOIS lookup both failed