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SGSiteGraph

jython.org

Home | Jython

Last scanned Aug 24, 2026, 1:23 PM

83

Overall score

Great

Summary

The Python runtime on the JVM. This website is hosted on Fastly. SEO is good (80/100) and accessibility is excellent (90/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: No H1 heading found.

The Python runtime on the JVM

United States
Hosted on Fastly

Top issues to fix

7 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.

  • 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.

  • robots.txt not found

    SEO

    Publish /robots.txt with a Sitemap: directive to guide crawlers.

+1 more issue — details in the sections below.

80

SEO

3 issue(s) found

100

Performance

448 ms

65

Security

HTTPS & header checks

90

Accessibility

1 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.

The Python runtime on the JVM

Meta tags

Title
Home | Jython
Description
The Python runtime on the JVM
Canonical
https://www.jython.org/
Language
en-US
Charset
utf-8
Viewport
width=device-width,maximum-scale=2
Robots meta
Manifest

OpenGraph & Twitter Card

OpenGraph

og:title
Home
og:description
The Python runtime on the JVM
og:type
website
og:url
https://www.jython.org/

Twitter Card

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

Technologies

Detected frameworks, languages, and tools.

No technologies detected.

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
  • 185.199.111.153
  • 185.199.108.153
  • 185.199.110.153
AAAA
  • 2606:50c0:8000::153
  • 2606:50c0:8002::153
  • 2606:50c0:8001::153
  • 2606:50c0:8003::153
MX—
TXT—
NS—
CAA
  • 0 issuewild "digicert.com"
  • 0 issue "digicert.com"
  • 0 issuewild "letsencrypt.org"
  • 0 issuewild "sectigo.com"
  • 0 issue "sectigo.com"
  • 0 issue "letsencrypt.org"
CNAME
  • jython.github.io
IPv6 supportYes

TLS / SSL certificate

Version
TLS 1.3
Issuer
Let's Encrypt
Subject
www.jython.org
Valid from
Jun 29, 2026
Valid to
Sep 27, 2026
Days until expiry
32
SAN domains
www.jython.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 3 · H3 0

Links

10 internal · 25 external · 0 broken

Images

1 total · 0 missing alt

Scripts / Styles

0 scripts · 2 stylesheets

JS / CSS size

0 B · 63.3 KB

Page size

10.7 KB

Robots.txt & Sitemap

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

SEO issues

  • No H1 heading found
  • robots.txt not found
  • sitemap.xml not found

Accessibility issues

  • No H1 heading found

Scan details

Requested URL
https://jython.org
Final URL
https://www.jython.org/
HTTP status
200
HTTP version
HTTP/2
Response time
448 ms
HTML size
10.7 KB
Redirect chain
https://jython.org → https://www.jython.org/

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Frequently asked questions

What technology does jython.org use?
We did not detect any specific technologies for jython.org in the latest scan.
Is jython.org secure (HTTPS)?
Yes. jython.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 27, 2026.
Who hosts jython.org?
jython.org is hosted on Fastly, behind Fastly CDN.
What is jython.org's SEO score?
jython.org scored 80/100 for SEO in the latest analysis (great).
What is jython.org's overall website score?
jython.org has an overall SiteGraph score of 83/100, combining SEO, performance, security, and accessibility.