HTTP Headers Analysis for https://robotframework.org

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

"6a0e53cf-7ed"

Expires

Caching

Thu, 21 May 2026 14:41:49 GMT

Last-Modified

Caching

Thu, 21 May 2026 00:37:35 GMT

age: 0
cache-control: max-age=600
etag: "6a0e53cf-7ed"
expires: Thu, 21 May 2026 14:41:49 GMT
last-modified: Thu, 21 May 2026 00:37:35 GMT

Content Headers

Content-Length

Content

2029

Content-Type

Content

text/html; charset=utf-8

content-length: 2029
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

Thu, 21 May 2026 14:31:49 GMT

Via

Other

1.1 varnish

X-Cache

Other

MISS

X-Cache-Hits

Other

0

X-Fastly-Request-Id

Other

3ec0101beffa689759e4570a673a9978079bcd79

X-Github-Request-Id

Other

4A7E:158BE9:23D3C80:2629EB0:6A0F1755

X-Origin-Cache

Other

HIT

X-Proxy-Cache

Other

MISS

X-Served-By

Other

cache-lga21947-LGA

X-Timer

Other

S1779373910.543502,VS0,VE16

date: Thu, 21 May 2026 14:31:49 GMT
via: 1.1 varnish
x-cache: MISS
x-cache-hits: 0
x-fastly-request-id: 3ec0101beffa689759e4570a673a9978079bcd79
x-github-request-id: 4A7E:158BE9:23D3C80:2629EB0:6A0F1755
x-origin-cache: HIT
x-proxy-cache: MISS
x-served-by: cache-lga21947-LGA
x-timer: S1779373910.543502,VS0,VE16

Recommendations

Enable compression (gzip/brotli) to improve performance