What technology does varnish-cache.org use?

We did not detect any specific technologies for varnish-cache.org in the latest scan.

Is varnish-cache.org secure (HTTPS)?

Yes. varnish-cache.org uses TLS 1.3 with a certificate issued by Sectigo Limited, valid until Nov 3, 2026.

Who hosts varnish-cache.org?

Hosting provider information for varnish-cache.org is not available yet.

What is varnish-cache.org's SEO score?

varnish-cache.org scored 85/100 for SEO in the latest analysis (great).

What is varnish-cache.org's overall website score?

varnish-cache.org has an overall SiteGraph score of 87/100, combining SEO, performance, security, and accessibility.

varnish-cache.org

Varnish Cache - An open-source HTTP accelerator with native TLS, built for the cloud-native era

Last scanned Jul 26, 2026, 5:47 AM

Overall score

Great

Summary

Varnish is a powerful, flexible HTTP accelerator that speeds up web applications by caching content and optimizing delivery. SEO is good (85/100) and accessibility is excellent (100/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Title longer than 60 characters.

Varnish Cache

Varnish is a powerful, flexible HTTP accelerator that speeds up web applications by caching content and optimizing delivery.

Top issues to fix

8 issues found · 2 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 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.
Title longer than 60 characters
SEO
Shorten the title to under 60 characters so search results don't truncate it.
robots.txt not found
SEO
Publish /robots.txt with a Sitemap: directive to guide crawlers.

+2 more issues — details in the sections below.

SEO

3 issue(s) found

100

Performance

558 ms

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.

Varnish Cache

Varnish is a powerful, flexible HTTP accelerator that speeds up web applications by caching content and optimizing delivery.

GitHub

Meta tags

Title: Varnish Cache - An open-source HTTP accelerator with native TLS, built for the cloud-native era
Description: Varnish is a powerful, flexible HTTP accelerator that speeds up web applications by caching content and optimizing delivery.
Canonical: https://www.varnish.org/
Language: en-us
Charset: utf-8
Viewport: width=device-width,initial-scale=1,shrink-to-fit=no
Robots meta: index, follow
Manifest: https://www.varnish.org/site.webmanifest

Technologies

Detected frameworks, languages, and tools.

No technologies detected.

Hosting & CDN

Hosting provider: —
CDN provider: Fastly
IP address: —
ASN: —

DNS records

Type	Value
A	—
AAAA	—
MX	—
TXT	—
NS	—
CAA	—
CNAME	—
IPv6 support	No

TLS / SSL certificate

Version: TLS 1.3
Issuer: Sectigo Limited
Subject: *.varnish.org
Valid from: Nov 3, 2025
Valid to: Nov 3, 2026
Days until expiry: 98
SAN domains: *.varnish.org, varnish.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 1 · H2 6 · H3 0

Links

11 internal · 15 external · 20 broken

Images

20 total · 4 missing alt

Scripts / Styles

6 scripts · 2 stylesheets

JS / CSS size

610 B · 0 B

Page size

82.9 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
robots.txt not found
sitemap.xml not found

Scan details

Requested URL: https://varnish-cache.org
Final URL: https://www.varnish.org/
HTTP status: 200
HTTP version: HTTP/2
Response time: 557 ms
HTML size: 82.9 KB
Redirect chain: https://varnish-cache.org → https://www.varnish.org/

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Frequently asked questions

What technology does varnish-cache.org use?: We did not detect any specific technologies for varnish-cache.org in the latest scan.
Is varnish-cache.org secure (HTTPS)?: Yes. varnish-cache.org uses TLS 1.3 with a certificate issued by Sectigo Limited, valid until Nov 3, 2026.
Who hosts varnish-cache.org?: Hosting provider information for varnish-cache.org is not available yet.
What is varnish-cache.org's SEO score?: varnish-cache.org scored 85/100 for SEO in the latest analysis (great).
What is varnish-cache.org's overall website score?: varnish-cache.org has an overall SiteGraph score of 87/100, combining SEO, performance, security, and accessibility.
What company operates varnish-cache.org?: varnish-cache.org is operated by Varnish Cache. Varnish is a powerful, flexible HTTP accelerator that speeds up web applications by caching content and optimizing delivery.