Infrastructure - https://gitbook.com BeaverCheck Audit

F

IPv6 Readiness

Action

IPv6 records exist but unreachable

FIX

IPv6 records exist but unreachable

IPv6 DNS records exist but server is not reachable

Having AAAA records but an unreachable server is worse than no AAAA — clients may experience delays before falling back to IPv4.

Got: 2a06:98c1:310d::ac40:92a7, 2606:4700:4404::6812:2959

IPv6 connection error

Got: dial tcp6 [2a06:98c1:310d::ac40:92a7]:443: connect: network is unreachable

IPv6 Misconfigured

AAAA Records 2a06:98c1:310d::ac40:92a7, 2606:4700:4404::6812:2959 Connection UNREACHABLE

Having AAAA records but an unreachable server is worse than no AAAA — clients may experience delays before falling back to IPv4.

Why this matters

Advertising IPv6 (AAAA records) without a reachable server means IPv6-preferring clients silently fail every connection.

Learn more ▾

Modern browsers prefer IPv6 if AAAA exists (Happy Eyeballs algorithm). If the IPv6 server isn't reachable, browsers fall back to IPv4 — but with seconds of added latency per request. Either fix IPv6 reachability or remove the AAAA records.

Source: RFC 8305 (Happy Eyeballs)

B

URL Variants

www/non-www, trailing slash, HTTP→HTTPS

REVIEW

www/non-www, trailing slash, HTTP→HTTPS

Both www and non-www versions serve content

Got: Both variants return 200 Expected: One variant 301-redirects to the other

HTTP correctly 301-redirects to HTTPS

www / non-www

200https://www.gitbook.com/

200https://gitbook.com/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://gitbook.com/ → https://gitbook.com/

Consistent

B

TLS Certificate Expiry & Recommendations

77 days until leaf cert expires — 2 issues to address

REVIEW

Certificate validity

77

days left

0d 30d 60d 90d+

Recommended actions

Enable HSTS: Strict-Transport-Security: max-age=31536000; includeSubDomains
Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy

B

CDN & Delivery

Cloudflare

REVIEW

Cloudflare

Site is served via Cloudflare CDN (edge: SJC)

Got: cf-ray: 9f002384c8dac4f3-SJC

CDN Detected: Cloudflare

Provider Cloudflare Evidence cf-ray: 9f002384c8dac4f3-SJC

A+

DNS Records

2 A records, 7 ms lookup

PASS

2 A records, 7 ms lookup

Resolves to 2 IPv4 address(es)

Got: 104.18.41.89, 172.64.146.167

Has 2 IPv6 (AAAA) record(s)

Got: 2a06:98c1:310d::ac40:92a7, 2606:4700:4404::6812:2959

2 nameserver(s) configured

Got: hugh.ns.cloudflare.com, dahlia.ns.cloudflare.com

5 mail exchanger(s) configured

CAA records not checked

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

SPF record present in TXT

DNS resolution time: 7 ms

Got: 7 ms

A	104.18.41.89, 172.64.146.167
AAAA	2a06:98c1:310d::ac40:92a7, 2606:4700:4404::6812:2959
CNAME	—
NS	hugh.ns.cloudflare.com, dahlia.ns.cloudflare.com
MX	1 aspmx.l.google.com 5 alt2.aspmx.l.google.com 5 alt1.aspmx.l.google.com 10 alt3.aspmx.l.google.com 10 alt4.aspmx.l.google.com
TXT	firebase=gitbook-28427 1eimfvl6smqf32ddsbrt935qqq 5c89abfus0pgntcdrib3m156gp openai-domain-verification=dv-LB8QOARyXE6YrjhX64RDyf8U google-site-verification=-MPeja1woOvE2Hs6BcUDgkCeYG9ZaAaCPqEyCMyXYLo google-site-verification=XTowlLW9jzAGRzz5Y7FkWT7IbJhWFjJuHwj0ex0vI38 google-site-verification=YEfVo29t-jyIdELW1-F_B1XQZBsknBgjKdvVXYsBaXc google-site-verification=ojxGhAwymkbkr39GFI8VBvWzC9THYX6WQABf9Q9-qyY google-site-verification=vjg2Tbif0nJQ-Kto4AwyZ5VnSSy6tHvD6vnJ0c5uMvk SPF v=spf1 a mx include:_spf.google.com include:sendgrid.net include:stspg-customer....
CAA	Lookup not available with standard resolver

Resolved in 7 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.

A

Redirect Chain

1 redirect(s), 123 ms total

PASS

1 redirect(s), 123 ms total

Single redirect

Got: https://gitbook.com → https://www.gitbook.com/ (302)

WWW normalization redirect

Uses 302 (temporary) redirect

If permanent, use 301 instead.

Got: https://gitbook.com

https://gitbook.com

32 ms · HTTP/1.1

302

https://www.gitbook.com/

91 ms · HTTP/1.1 FINAL

#	URL	Status	Time	Protocol	Server
1	https://gitbook.com	302	32 ms	HTTP/1.1	cloudflare
2	https://www.gitbook.com/	200	91 ms	HTTP/1.1	cloudflare

See the visual redirect chain in the HTTP Probe tab →

If permanent, use 301 instead.

Why this matters

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

A+

Crawlability

robots.txt present, sitemap with 258 URLs

PASS

robots.txt present, sitemap with 258 URLs

robots.txt is present

Got: 68 bytes

sitemap.xml is present

sitemap.xml is valid XML

sitemap.xml contains 258 entries

robots.txt references sitemap

robots.txt 200 OK

Size 68 B Sitemaps referenced 1 User-agents * Blocking No — crawling allowed

User-agent: *
Allow: /

Sitemap: https://www.gitbook.com/sitemap.xml

sitemap.xml 200 OK

Type URL Set URLs 258 entries Valid XML Yes

Sample URLs:

A+

Domain Intelligence

gitbook.com — via Cloudflare, Inc., 12 years old, hosted on Cloudflare

PASS

gitbook.com — via Cloudflare, Inc., 12 years old, hosted on Cloudflare

Domain registered until Jun 12, 2030 (4 years, 2 months remaining)

DNSSEC is enabled

Registrar: Cloudflare, Inc.

Registrar lock is NOT enabled

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.

Hosting: Cloudflare

Got: AS13335

Domain expiry

1458 days

June 12, 2030

SSL certificate

77 days

Issued by Google Trust Services

Domain age

12 years

Registered June 12, 2014

DNSSEC

Enabled

Protects against DNS spoofing

Hosting

Cloudflare

ASN AS13335

104.18.41.89

Registrar

Cloudflare, Inc.

Unlocked 2 NS records

Expiry timeline

Today

+1 year

Domain expiry SSL expiry Danger zone (≤30 days)

Recommended actions

Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers

Registrar Cloudflare, Inc.

Created June 12, 2014 (12 years ago)

Expires June 12, 2030 (4 years, 2 months)

Last Updated October 19, 2025

Name Servers dahlia.ns.cloudflare.com, hugh.ns.cloudflare.com

DNSSEC Enabled

Hosting

IP Address 104.18.41.89

ASN AS13335 (CLOUDFLARENET - Cloudflare, Inc., US)

Provider Cloudflare

Data source: rdap (0.2s)

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.

Why this matters

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

A+

HTTP Probe Timing

Total 32 ms — DNS, TCP, TLS, TTFB, content transfer breakdown

PASS

DNS Lookup

7 ms

TCP Connect

4 ms

TLS Handshake

9 ms

Time to First Byte

32 ms

Total Time

32 ms

Connection waterfall

DNS Lookup 7 ms TCP Connect 4 ms TLS Handshake 9 ms Server Processing 12 ms Content Transfer 0 ms