HTTP Headers Analysis for https://www.powsybl.com

Detected Technologies from Headers

See all in URL Inspect 3

Fastly

GitHub Active incidents

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

"6a451678-4eff"

Expires

Caching

Mon, 20 Jul 2026 04:53:03 GMT

Last-Modified

Caching

Wed, 01 Jul 2026 13:30:32 GMT

age: 0
cache-control: max-age=600
etag: "6a451678-4eff"
expires: Mon, 20 Jul 2026 04:53:03 GMT
last-modified: Wed, 01 Jul 2026 13:30:32 GMT

Content Headers

Content-Length

Content

20223

Content-Type

Content

text/html; charset=utf-8

content-length: 20223
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

Mon, 20 Jul 2026 04:43:03 GMT

Via

Other

1.1 varnish

X-Cache

Other

MISS

X-Cache-Hits

Other

0

X-Fastly-Request-Id

Other

58d8850f9721ce3318cd67b856f0f474e484b12c

X-Github-Request-Id

Other

760A:24D4BB:7014B7F:74C2C53:6A5DA756

X-Proxy-Cache

Other

MISS

X-Served-By

Other

cache-nyc-kteb1890034-NYC

X-Timer

Other

S1784522583.085182,VS0,VE31

date: Mon, 20 Jul 2026 04:43:03 GMT
via: 1.1 varnish
x-cache: MISS
x-cache-hits: 0
x-fastly-request-id: 58d8850f9721ce3318cd67b856f0f474e484b12c
x-github-request-id: 760A:24D4BB:7014B7F:74C2C53:6A5DA756
x-proxy-cache: MISS
x-served-by: cache-nyc-kteb1890034-NYC
x-timer: S1784522583.085182,VS0,VE31

Recommendations

Enable compression (gzip/brotli) to improve performance