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

Detected Technologies from Headers

See all in URL Inspect 3

Fastly

GitHub

Varnish

HTTP Security Headers

Status

Strict-Transport-Security

Missing

Not configured

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

• Add Strict-Transport-Security header with max-age of at least 1 year
• 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

"62b42a34-fb"

Expires

Caching

Sun, 02 Aug 2026 09:12:43 GMT

Last-Modified

Caching

Thu, 23 Jun 2022 08:54:12 GMT

age: 0
cache-control: max-age=600
etag: "62b42a34-fb"
expires: Sun, 02 Aug 2026 09:12:43 GMT
last-modified: Thu, 23 Jun 2022 08:54:12 GMT

Content Headers

Content-Length

Content

251

Content-Type

Content

text/html; charset=utf-8

content-length: 251
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

Sun, 02 Aug 2026 09:02:43 GMT

Via

Other

1.1 varnish

X-Cache

Other

MISS

X-Cache-Hits

Other

0

X-Fastly-Request-Id

Other

3c69ae2e8bbf8639681b0830ec6b8f1865b75099

X-Github-Edge-Region

Other

iad

X-Github-Request-Id

Other

C5F6:327AE9:2C3389E:2FB70E8:6A6F07B3

X-Proxy-Cache

Other

MISS

X-Served-By

Other

cache-lga21962-LGA

X-Timer

Other

S1785661363.362413,VS0,VE29

date: Sun, 02 Aug 2026 09:02:43 GMT
via: 1.1 varnish
x-cache: MISS
x-cache-hits: 0
x-fastly-request-id: 3c69ae2e8bbf8639681b0830ec6b8f1865b75099
x-github-edge-region: iad
x-github-request-id: C5F6:327AE9:2C3389E:2FB70E8:6A6F07B3
x-proxy-cache: MISS
x-served-by: cache-lga21962-LGA
x-timer: S1785661363.362413,VS0,VE29

Recommendations

Enable compression (gzip/brotli) to improve performance