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Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
98
GRADE
A+
FIX
0
REVIEW
1
PASS
7
INFO
1
Probed from Sao Paulo, Brazil
200 OK
Checks
9
7 PASS 1 REVIEW
B
TLS Certificate Expiry & Recommendations
357 days until leaf cert expires — 4 issues to address
REVIEW

Certificate validity

357
days left
0d 30d 60d 90d+

Recommended actions

  • Extend HSTS max-age to at least 31536000 (1 year) to meet the preload list criteria
  • Add the preload directive and submit to hstspreload.org once max-age + includeSubDomains are in place
  • 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
A
DNS Records
2 A records, 1506 ms lookup
PASS
2 A records, 1506 ms lookup
Info::
Resolves to 2 IPv4 address(es)
Got: 172.64.145.101, 104.18.42.155
Info::
Has 2 IPv6 (AAAA) record(s)
Got: 2a06:98c1:3106::6812:2a9b, 2606:4700:4406::ac40:9165
Info::
2 nameserver(s) configured
Got: theo.ns.cloudflare.com, mary.ns.cloudflare.com
Info::
3 mail exchanger(s) configured
Info::
CAA records not checked
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Info::
SPF record present in TXT
Warning::
DNS resolution is slow (1506 ms)
Slow DNS adds latency to every page load. Consider a faster DNS provider.
Got: 1506 ms
A172.64.145.101, 104.18.42.155
AAAA2a06:98c1:3106::6812:2a9b, 2606:4700:4406::ac40:9165
CNAME—
NStheo.ns.cloudflare.com, mary.ns.cloudflare.com
MX
13 isaac.mx.cloudflare.net
80 amir.mx.cloudflare.net
90 linda.mx.cloudflare.net
TXT
lrcgkxfxkbx4r60sz8kxghxpv8n04mhs
_8bf4m05zgllzh6kpmbdw29k8s51faur
status-page-domain-verification=64j92k6cfs22
atlassian-domain-verification=axGNi8XOxPg2qasalLkg8DO6ODN7aQn9/aoDhzplZ/9Z4Oxkye...
google-site-verification=Z9wK7ueF-FuImFwV628x5gnY-FfL7jNaIVnGcMobeyY
google-site-verification=YSdDbpdDobwxE01DfU6-38UABqxNWafTc6vk-Df_mnk
CFE5-A8BB-39C8-811C-275E-359B-7D50-A9A2
e601f6cfb729414088b22175584eb026
_ng92d6yb9n8jfhfjkgaixcyflt73g28
SPF v=spf1 include:_spf.mx.cloudflare.net -all
MS=ms74802145
google-site-verification=c0oGXYGH7hFxErftte8bCH7IQmolmHNq9HUx4rqu8YI
CAALookup not available with standard resolver
Resolved in 1506 ms

CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.

Why this matters

Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.

Slow DNS adds latency to every page load. Consider a faster DNS provider.

Why this matters

DNS resolution is slow — anycast DNS providers (Cloudflare, Route 53) typically resolve <50ms globally.

Source: DNS performance benchmarks

A+
Redirect Chain
No redirects — direct access
PASS
No redirects — direct access
Info::
No redirects — direct access
Got: https://spring.io

https://spring.io

75 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://spring.io20075 msHTTP/1.1cloudflare
A+
IPv6 Readiness
IPv6 reachable (1 ms)
PASS
IPv6 reachable (1 ms)
Info::
IPv6 is configured and reachable at 2a06:98c1:3106::6812:2a9b, 2606:4700:4406::ac40:9165
Got: 1 ms connect
IPv6 Ready
AAAA Records 2a06:98c1:3106::6812:2a9b, 2606:4700:4406::ac40:9165 Connection Reachable (1 ms)
A+
Crawlability
robots.txt present, sitemap with 1 URLs
PASS
robots.txt present, sitemap with 1 URLs
Info::
robots.txt is present
Got: 92 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 1 entries
Info::
Sitemap index with 1 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 92 B Sitemaps referenced 1 User-agents * Blocking No — crawling allowed
User-agent: *
Allow: /
Sitemap: https://spring.io/sitemap-index.xml
Host: https://spring.io
sitemap.xml 200 OK
Type Sitemap Index URLs 1 entries Valid XML Yes
Child Sitemaps:
A+
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
PASS
www/non-www, trailing slash, HTTP→HTTPS
Info::
www/non-www redirect configured correctly (preferred: non-www)
Info::
HTTP correctly 301-redirects to HTTPS

www / non-www

301https://www.spring.io/
200https://spring.io/

Preferred variant: non-www

HTTP → HTTPS

301http://spring.io/ → https://spring.io/

Consistent

A+
HTTP Probe Timing
Total 84 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
6 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
1 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
7 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
81 ms
Total Time Total request time from DNS lookup through full response.
84 ms

Connection waterfall

DNS Lookup 6 ms TCP Connect 1 ms TLS Handshake 7 ms Server Processing 67 ms Content Transfer 3 ms
A
CDN & Delivery
Cloudflare (DYNAMIC)
PASS
Cloudflare (DYNAMIC)
Info::
Site is served via Cloudflare CDN (edge: GRU)
Got: cf-ray: 9e71cd5f5a783002-GRU
Info::
CDN cache status: DYNAMIC
CDN Detected: Cloudflare
Provider Cloudflare Cache Status DYNAMIC Evidence cf-ray: 9e71cd5f5a783002-GRU
Domain Intelligence
Domain intelligence data not available
INFO
Domain intelligence data not available

RDAP and WHOIS lookup both failed

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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