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SGSiteGraph

bookdown.org

Home | Bookdown

Last scanned Jul 27, 2026, 1:43 PM · 1 view

81

Overall score

Great

Summary

This website is hosted on AWS. SEO is fair (65/100) and accessibility is excellent (100/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Missing meta description.

United States
Hosted on AWS

Top issues to fix

9 issues found · 3 high priority

  • Missing Strict-Transport-Security header

    Security

    Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.

  • Missing Content-Security-Policy header

    Security

    Add a CSP to control which sources can run scripts — the strongest single defense against XSS.

  • Missing meta description

    SEO

    Add a ~150-character meta description to control your search-result snippet and lift click-through rate.

  • Missing X-Content-Type-Options header

    Security

    Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.

  • Missing X-Frame-Options header

    Security

    Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.

  • Missing canonical link

    SEO

    Add <link rel="canonical"> so search engines know which URL variant to index.

+3 more issues — details in the sections below.

65

SEO

5 issue(s) found

100

Performance

12 ms

65

Security

HTTPS & header checks

100

Accessibility

0 issue(s) found

Not enough scan history yet to show a trend — check back after this site has been re-scanned a few more times.

Organization

Company details published in this site's own structured data.

X (Twitter)

Meta tags

Title
Home | Bookdown
Description
Canonical
Language
en-us
Charset
utf-8
Viewport
width=device-width, initial-scale=1
Robots meta
Manifest

OpenGraph & Twitter Card

OpenGraph

og:title
—
og:description
—
og:type
—
og:url
—

Twitter Card

twitter:card
summary
twitter:title
bookdown: Authoring Books and Technical Documents with R Markdown
twitter:description
The platform bookdown.org is provided by RStudio for authors to publish books online for free. The bookdown package is an open-source R package that facilitates writing books and long-form articles/reports with R Markdown.

Technologies

Detected frameworks, languages, and tools.

No technologies detected.

Hosting & CDN

Hosting provider
AWS
CDN provider
CloudFront
IP address
13.227.249.106
ASN
AS16509 (AMAZON-02 - Amazon.com, Inc., US)

DNS records

TypeValue
A
  • 13.227.249.106
  • 13.227.249.113
  • 13.227.249.93
  • 13.227.249.97
AAAA
  • 2600:9000:200a:7800:11:d45b:e040:93a1
  • 2600:9000:200a:f800:11:d45b:e040:93a1
  • 2600:9000:200a:2c00:11:d45b:e040:93a1
  • 2600:9000:200a:3c00:11:d45b:e040:93a1
  • 2600:9000:200a:7400:11:d45b:e040:93a1
  • 2600:9000:200a:2a00:11:d45b:e040:93a1
  • 2600:9000:200a:ca00:11:d45b:e040:93a1
  • 2600:9000:200a:da00:11:d45b:e040:93a1
MX—
TXT
  • google-site-verification=WC52jDA3irjxfzcFfpP0x6Z6BoFLGUKGH19A_Y5zc2A
NS
  • ns-475.awsdns-59.com
  • ns-761.awsdns-31.net
  • ns-1038.awsdns-01.org
  • ns-1719.awsdns-22.co.uk
CAA—
CNAME—
IPv6 supportYes

TLS / SSL certificate

Version
TLS 1.3
Issuer
Amazon
Subject
bookdown.org
Valid from
Dec 22, 2025
Valid to
Jan 20, 2027
Days until expiry
177
SAN domains
bookdown.org, www.bookdown.org

Security headers

  • Strict-Transport-SecurityMissing
  • Content-Security-PolicyMissing
  • X-Frame-OptionsMissing
  • X-Content-Type-OptionsMissing
  • Referrer-PolicyMissing
  • Permissions-PolicyMissing

Compression: none · 0 cookie(s) observed

Content & assets

Headings

H1 23 · H2 23 · H3 0

Links

14 internal · 36 external · 0 broken

Images

24 total · 0 missing alt

Scripts / Styles

3 scripts · 2 stylesheets

JS / CSS size

19.7 KB · 5.0 KB

Page size

38.4 KB

Robots.txt & Sitemap

robots.txt
Not found
Disallow rules
0
sitemap.xml
Found
URLs in sitemap
1858

SEO issues

  • Missing meta description
  • Missing canonical link
  • Multiple H1 headings found
  • No structured data (JSON-LD) found
  • robots.txt not found

Accessibility issues

No accessibility issues detected.

Scan details

Requested URL
https://bookdown.org
Final URL
https://bookdown.org
HTTP status
200
HTTP version
HTTP/2
Response time
12 ms
HTML size
38.4 KB
Redirect chain
https://bookdown.org

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does bookdown.org use?
We did not detect any specific technologies for bookdown.org in the latest scan.
Is bookdown.org secure (HTTPS)?
Yes. bookdown.org uses TLS 1.3 with a certificate issued by Amazon, valid until Jan 20, 2027.
Who hosts bookdown.org?
bookdown.org is hosted on AWS, behind CloudFront CDN.
What is bookdown.org's SEO score?
bookdown.org scored 65/100 for SEO in the latest analysis (fair).
What is bookdown.org's overall website score?
bookdown.org has an overall SiteGraph score of 81/100, combining SEO, performance, security, and accessibility.