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scikit-learn.org

scikit-learn: machine learning in Python — scikit-learn 0.16.1 documentation

Last scanned Jul 25, 2026, 4:25 PM · 2 views

72

Overall score

Fair

Summary

This website uses jQuery hosted on Fastly behind Fastly CDN. SEO is fair (50/100) and accessibility is good (80/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Title longer than 60 characters.

United States
Hosted on Fastly

Top issues to fix

12 issues found · 4 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.

  • No H1 heading found

    SEO

    Add exactly one H1 describing the page's main topic — it anchors the document outline for search engines and screen readers.

  • 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.

+6 more issues — details in the sections below.

50

SEO

7 issue(s) found

100

Performance

5 ms

65

Security

HTTPS & header checks

80

Accessibility

2 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.

Meta tags

Title
scikit-learn: machine learning in Python — scikit-learn 0.16.1 documentation
Description
Canonical
https://scikit-learn.org/stable/index.html
Language
Charset
utf-8
Viewport
width=device-width, initial-scale=1.0
Robots meta
Manifest

OpenGraph & Twitter Card

OpenGraph

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

Twitter Card

twitter:card
—
twitter:title
—
twitter:description
—

Technologies

Detected frameworks, languages, and tools.

BootstrapjQuery

Hosting & CDN

Hosting provider
Fastly
CDN provider
Fastly
IP address
185.199.109.153
ASN
AS54113 (FASTLY - Fastly, Inc., US)

DNS records

TypeValue
A
  • 185.199.109.153
  • 185.199.108.153
  • 185.199.110.153
  • 185.199.111.153
AAAA—
MX
  • fb.mail.gandi.net
  • spool.mail.gandi.net
TXT
  • v=spf1 include:_mailcust.gandi.net ?all
  • google-site-verification=QssZbfwOh4lOaQS73YbJDtQl5PNuu5no8EzxYjgm0Go
NS
  • ns-83-c.gandi.net
  • ns-38-b.gandi.net
  • ns-83-a.gandi.net
CAA—
CNAME—
IPv6 supportNo

TLS / SSL certificate

Version
TLS 1.3
Issuer
Let's Encrypt
Subject
scikit-learn.org
Valid from
Jun 28, 2026
Valid to
Sep 26, 2026
Days until expiry
62
SAN domains
scikit-learn.org, www.scikit-learn.org

Security headers

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

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 0 · H2 0 · H3 0

Links

0 internal · 0 external · 0 broken

Images

0 total · 0 missing alt

Scripts / Styles

6 scripts · 5 stylesheets

JS / CSS size

46.0 KB · 45.8 KB

Page size

2.0 KB

Robots.txt & Sitemap

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

SEO issues

  • Title longer than 60 characters
  • Missing meta description
  • No H1 heading found
  • No structured data (JSON-LD) found
  • Missing OpenGraph tags
  • robots.txt not found
  • sitemap.xml not found

Accessibility issues

  • No H1 heading found
  • Missing <html lang> attribute

Scan details

Requested URL
https://scikit-learn.org
Final URL
https://scikit-learn.org
HTTP status
200
HTTP version
HTTP/2
Response time
5 ms
HTML size
2.0 KB
Redirect chain
https://scikit-learn.org

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does scikit-learn.org use?
scikit-learn.org is built with Bootstrap, jQuery.
Is scikit-learn.org secure (HTTPS)?
Yes. scikit-learn.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 26, 2026.
Who hosts scikit-learn.org?
scikit-learn.org is hosted on Fastly, behind Fastly CDN.
What is scikit-learn.org's SEO score?
scikit-learn.org scored 50/100 for SEO in the latest analysis (fair).
What is scikit-learn.org's overall website score?
scikit-learn.org has an overall SiteGraph score of 72/100, combining SEO, performance, security, and accessibility.