HTTP Headers Analysis for https://docs.coveralls.io

Detected Technologies from Headers

See all in URL Inspect 5

Cloudflare NEL Monitoring

Cloudflare CDN

Fastly

GitHub

Varnish

HTTP Security Headers

Status

Strict-Transport-Security

Excellent

max-age=31536000; includeSubDomains; preload

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

Good

nosniff

Referrer-Policy

Missing

Not configured

Permissions-Policy

Missing

Not configured

Recommendations

• Add Content-Security-Policy header to prevent XSS attacks
• Add X-Frame-Options: DENY or SAMEORIGIN to prevent clickjacking
• Add Referrer-Policy header (recommended: strict-origin-when-cross-origin)
• Consider adding Permissions-Policy to control browser features

Performance Headers

Connection

Performance

close

Transfer-Encoding

Performance

chunked

Vary

Performance

Accept-Encoding

connection: close
transfer-encoding: chunked
vary: Accept-Encoding

Caching Headers

Age

Caching

0

Cache-Control

Caching

max-age=600

Expires

Caching

Sat, 25 Apr 2026 10:35:30 GMT

Last-Modified

Caching

Thu, 19 Mar 2026 15:32:05 GMT

age: 0
cache-control: max-age=600
expires: Sat, 25 Apr 2026 10:35:30 GMT
last-modified: Thu, 19 Mar 2026 15:32:05 GMT

Content Headers

Content-Type

Content

text/html; charset=utf-8

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

Server Headers

Server

cloudflare

server: cloudflare

CORS Headers

Access-Control-Allow-Origin

Cors

*

access-control-allow-origin: *

Cookies Headers

No cookies headers found

Other Headers

Alt-Svc

Other

h3=":443"; ma=86400

Cf-Cache-Status

Other

DYNAMIC

Cf-Ray

Other

9f1cd086ab9a9388-IAD

Date

Other

Sat, 25 Apr 2026 10:55:17 GMT

Nel

Other

Report-To Group cf-nel max-age: 1w

success: 0.0%

Report-To

Other

Group cf-nel max-age: 1w

Endpoint 1 https://a.nel.cloudflare.com/report/v4?s=piA81f0zFItiD44LiG5FiHTilMzdHe6Hxb5K%2FLo2N3lJMLAduSuRI%2BImrGPUzUeAD40B5k0cfkfzfCtsBwyGhZVEg4i6FPrrhxx62lfdXc5M4eCcu53b7TmesNTOALac22ee

Via

Other

1.1 varnish

X-Cache

Other

HIT

X-Cache-Hits

Other

0

X-Fastly-Request-Id

Other

722a07fbb56f8311324389b5930d78208c96078a

X-Github-Request-Id

Other

10BC:143F22:1EFC2FC:22A6C53:69EC969A

X-Proxy-Cache

Other

MISS

X-Served-By

Other

cache-iad-kiad7000143-IAD

X-Timer

Other

S1777114518.558430,VS0,VE24

alt-svc: h3=":443"; ma=86400
cf-cache-status: DYNAMIC
cf-ray: 9f1cd086ab9a9388-IAD
date: Sat, 25 Apr 2026 10:55:17 GMT
nel: {"report_to":"cf-nel","success_fraction":0.0,"max_age":604800}
report-to: {"group":"cf-nel","max_age":604800,"endpoints":[{"url":"https://a.nel.cloudflare.com/report/v4?s=piA81f0zFItiD44LiG5FiHTilMzdHe6Hxb5K%2FLo2N3lJMLAduSuRI%2BImrGPUzUeAD40B5k0cfkfzfCtsBwyGhZVEg4i6FPrrhxx62lfdXc5M4eCcu53b7TmesNTOALac22ee"}]}
via: 1.1 varnish
x-cache: HIT
x-cache-hits: 0
x-fastly-request-id: 722a07fbb56f8311324389b5930d78208c96078a
x-github-request-id: 10BC:143F22:1EFC2FC:22A6C53:69EC969A
x-proxy-cache: MISS
x-served-by: cache-iad-kiad7000143-IAD
x-timer: S1777114518.558430,VS0,VE24

Recommendations

Enable compression (gzip/brotli) to improve performance