HTTP Headers Analysis for https://ktlint.github.io

Detected Technologies from Headers

See all in URL Inspect 3

Fastly

GitHub

Varnish

HTTP Security Headers

Status

Strict-Transport-Security

Present

max-age=31556952

Content-Security-Policy

Missing

Not configured Analyze

Content-Security-Policy-Report-Only

Missing

Not configured Analyze

X-Frame-Options

Missing

Not configured

X-Content-Type-Options

Missing

Not configured

Referrer-Policy

Missing

Not configured

Permissions-Policy

Missing

Not configured

Recommendations

• Increase HSTS max-age to at least 1 year and add includeSubDomains
• Add Content-Security-Policy header to prevent XSS attacks
• Add X-Frame-Options: DENY or SAMEORIGIN to prevent clickjacking
• Add X-Content-Type-Options: nosniff
• Add Referrer-Policy header (recommended: strict-origin-when-cross-origin)
• Consider adding Permissions-Policy to control browser features

Performance Headers

Accept-Ranges

Performance

bytes

Connection

Performance

close

Vary

Performance

Accept-Encoding

accept-ranges: bytes
connection: close
vary: Accept-Encoding

Caching Headers

Age

Caching

0

Cache-Control

Caching

max-age=600

Etag

Caching

"6340876c-64"

Expires

Caching

Wed, 29 Jul 2026 11:55:25 GMT

Last-Modified

Caching

Fri, 07 Oct 2022 20:09:16 GMT

age: 0
cache-control: max-age=600
etag: "6340876c-64"
expires: Wed, 29 Jul 2026 11:55:25 GMT
last-modified: Fri, 07 Oct 2022 20:09:16 GMT

Content Headers

Content-Length

Content

100

Content-Type

Content

text/html; charset=utf-8

content-length: 100
content-type: text/html; charset=utf-8

Server Headers

Server

GitHub.com

server: GitHub.com

CORS Headers

Access-Control-Allow-Origin

Cors

*

access-control-allow-origin: *

Cookies Headers

No cookies headers found

Other Headers

Date

Other

Wed, 29 Jul 2026 11:45:25 GMT

Via

Other

1.1 varnish

X-Cache

Other

MISS

X-Cache-Hits

Other

0

X-Fastly-Request-Id

Other

1d47e7d38d128be323f2011f322daf366b0a8299

X-Github-Request-Id

Other

DA04:1217D7:15090B6:168728D:6A69E7D5

X-Proxy-Cache

Other

MISS

X-Served-By

Other

cache-nyc-kteb1890050-NYC

X-Timer

Other

S1785325526.763674,VS0,VE16

date: Wed, 29 Jul 2026 11:45:25 GMT
via: 1.1 varnish
x-cache: MISS
x-cache-hits: 0
x-fastly-request-id: 1d47e7d38d128be323f2011f322daf366b0a8299
x-github-request-id: DA04:1217D7:15090B6:168728D:6A69E7D5
x-proxy-cache: MISS
x-served-by: cache-nyc-kteb1890050-NYC
x-timer: S1785325526.763674,VS0,VE16

Recommendations

Enable compression (gzip/brotli) to improve performance