Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.DRedirect ChainAction2 redirect(s), 2971 ms totalFIX
https://zol.com.cn
1246 ms · HTTP/1.1
http://www.zol.com.cn/
887 ms · HTTP/1.1
https://www.zol.com.cn/
839 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://zol.com.cn | 301 | 1246 ms | HTTP/1.1 | openresty |
| 2 | http://www.zol.com.cn/ | 301 | 887 ms | HTTP/1.1 | openresty |
| 3 | https://www.zol.com.cn/ | 200 | 839 ms | HTTP/1.1 | openresty |
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
Redirect directly from https://zol.com.cn to https://www.zol.com.cn/
Redirect chain could be flattened to one hop — server config tweak removes intermediate latency.
Source: web.dev
DCDN & DeliveryActionNo CDN detectedFIX
Consider using a CDN to improve global delivery speed and reduce origin load.
CIPv6 ReadinessActionNo IPv6 supportREVIEW
IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.
No AAAA records — same impact as 'no IPv6 (AAAA) records'; IPv6-preferring clients pay extra latency falling back to IPv4.
Source: Google IPv6 stats
BURL Variantswww/non-www, trailing slash, HTTP→HTTPSREVIEW
www / non-www
Inconsistent — duplicate content risk
HTTP → HTTPS
Consistent
BHTTP Probe TimingTotal 1247 ms — DNS, TCP, TLS, TTFB, content transfer breakdownREVIEW
Connection waterfall
BTLS Certificate Expiry & Recommendations291 days until leaf cert expires — 4 issues to addressREVIEW
Certificate validity
Recommended actions
- Prefer TLS 1.3 — TLS 1.2 is acceptable but TLS 1.3 removes RSA key exchange and improves latency
- 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
ADNS Records1 A records, 611 ms lookupPASS
| A | 123.59.191.4 |
| AAAA | — |
| CNAME | — |
| NS | ns1.zol.com, ns.zol.com |
| MX | 10 staff.zol.com.cn |
| TXT | google-site-verification=SOqdyws7I0x3IhTWjwLgwDMra4P92J8z8C2-5JOGu0M 6c5g3736f6vjbb2hbkgskndrr997s0x4 SPF v=spf1 ip4:123.59.191.0/25 ip4:123.59.191.128/26 ~all |
| CAA | Lookup not available with standard resolver |
Multiple A records provide failover if one server goes down.
Single A record means a single point of failure — if that IP goes down, your site is unreachable until DNS TTL expires.
Learn more ▾ ▴
Add multiple A records for round-robin failover, or use a managed DNS provider with health-checked failover (Route 53, Cloudflare, NS1). Short TTL (60-300s) lets clients recover faster on outages.
Source: SRE practice / DNS architecture
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.
Slow DNS adds latency to every page load. Consider a faster DNS provider.
DNS resolution is slow — anycast DNS providers (Cloudflare, Route 53) typically resolve <50ms globally.
Source: DNS performance benchmarks
A+Crawlabilityrobots.txt present, sitemap with 0 URLsPASS
Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.
robots.txt omits Sitemap: directive — crawlers must fetch /sitemap.xml by convention; reliable but missing the explicit hint.
Source: sitemaps.org
User-agent: *
Disallow:/?*
Disallow:/index.html
Disallow:/index.shtml
Disallow:/shequjingxuan
Disallow:/marketing/case/q=*
A+Domain Intelligencezol.com.cn — via 阿里云计算有限公司（万网）, 27 years, 6 months old, hosted on CHINANET-IDC-BJ-AP IDC, China Telecommunications Corporation, CNPASS
225 days
March 1, 2027
291 days
Issued by DigiCert, Inc.
27 years, 6 months
Registered March 1, 1999
Status unknown
Protects against DNS spoofing
CHINANET-IDC-BJ-AP IDC, China Telecommunications Corporation, CN
ASN AS23724
123.59.191.4
阿里云计算有限公司（万网）
Expiry timeline
Recommended actions
- Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.
Without registrar lock, an attacker who phishes your registrar credentials can transfer the domain in minutes — total brand hijack.
Learn more ▾ ▴
Registrar lock (clientTransferProhibited, clientUpdateProhibited, clientDeleteProhibited) requires extra verification before any transfer/update/delete. Every major registrar offers it free. Combined with 2FA on your registrar account, it's the strongest defense against domain hijacking.
Source: ICANN / domain-security best practice