HTTP Headers Analysis for https://docs.ably.com

Detected Technologies from Headers

See all in URL Inspect 2

Cloudflare CDN

Heroku

HTTP Security Headers

Status

Strict-Transport-Security

Present

max-age=15552000; preload

Content-Security-Policy

Missing

Not configured Analyze

Content-Security-Policy-Report-Only

Missing

Not configured Analyze

X-Frame-Options

Good

SAMEORIGIN

X-Content-Type-Options

Good

nosniff

Referrer-Policy

Good

strict-origin-when-cross-origin

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
• Consider adding Permissions-Policy to control browser features

Performance Headers

Connection

Performance

close

Transfer-Encoding

Performance

chunked

Vary

Performance

Origin,Accept-Encoding

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

Caching Headers

Cache-Control

Caching

max-age=0, private, must-revalidate

cache-control: max-age=0, private, must-revalidate

Content Headers

Content-Type

Content

text/html; charset=utf-8

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

Server Headers

Server

cloudflare

X-Runtime

Server

0.104689

server: cloudflare
x-runtime: 0.104689

CORS Headers

No CORS headers found

Cookies Headers

Set-Cookie

Cookies

set-cookie: ably_device_id=NoXio0oIK8BmpMKz5GvRDS5igWK7Ve7cD12%2F57P4UMXzKybSLTGfgmg5gGSlvup0P1eLBjnpshAQQEA5HVOxB76iR4JjgH0sBMREtQ1HdHcsViYiUn76aICiK5IiekpFpr2ooYeK63ZPArmA3nM9%2FL1uSHr7AXJVQRJnce0ELk22rEkyFxXpLj8DJZI%3D--kjA9eA3WyDFROjX%2F--SdnXuTzOuZXOA9LRi0yIWA%3D%3D; path=/; expires=Tue, 04 May 2027 07:01:34 GMT; HttpOnly; SameSite=Lax; secure
_ably_session=RF24Y8x0VKwLQtVKmvBh7yR0ixo3ddKD5CxcnPZ681CzHGLyb1KSVVLQbTEa7il0ecsRqKcwlX7NyReHiv%2FkjE993tg30N65aCKqg8PJ9Hlisf0jn52jIJF4%2BwmmH1fyRAQn6DOn0USWOrStvBvTBwuZx1WseuKKFP0kZc8Armj%2BcRMnGFh%2BUg2onAf58Rf5aqokdOC7WgDVzcyvGWS8RhVaOctVrREPeia5zrIjT6u%2B9rplipFq3iC4GpM1DF1Q1y3fOo056e2xaI%2FyQGvWvzEaoYaMC8oPQDfgSIyEz%2F%2FFe%2BG7VqAHFLEeMMB3xBcw4wTsuYKHYikRBCAz8q%2Fcsl5x5USplIY%3D--LHYJ9Ck8BfnEOe0l--Wo%2F2%2BUhTZgvIVkviE8m3kA%3D%3D; path=/; expires=Mon, 04 May 2026 09:01:34 GMT; secure; HttpOnly; SameSite=Lax

Other Headers

Cf-Cache-Status

Other

BYPASS

Cf-Ray

Other

9f65a2893c15778a-IAD

Date

Other

Mon, 04 May 2026 07:01:34 GMT

Nel

Other

Report-To Group heroku-nel max-age: 1h

success: 1.0% failure: 10.0%

Report-To

Other

Group heroku-nel max-age: 1h

Endpoint 1 https://nel.heroku.com/reports?s=pV8czQcodc3I%2BQEvY8zSf9tt7X5Jv9AhbULOuJAizHI%3D&sid=c46efe9b-d3d2-4a0c-8c76-bfafa16c5add&ts=1777878094

Reporting-Endpoints

Other

heroku-nel="https://nel.heroku.com/reports?s=pV8czQcodc3I%2BQEvY8zSf9tt7X5Jv9AhbULOuJAizHI%3D&sid=c46efe9b-d3d2-4a0c-8c76-bfafa16c5add&ts=1777878094"

Via

Other

2.0 heroku-router

X-Download-Options

Other

noopen

X-Permitted-Cross-Domain-Policies

Other

none

X-Request-Id

Other

d2c891c3-fe63-aa3b-b286-55fe82e92bec

cf-cache-status: BYPASS
cf-ray: 9f65a2893c15778a-IAD
date: Mon, 04 May 2026 07:01:34 GMT
nel: {"report_to":"heroku-nel","response_headers":["Via"],"max_age":3600,"success_fraction":0.01,"failure_fraction":0.1}
report-to: {"group":"heroku-nel","endpoints":[{"url":"https://nel.heroku.com/reports?s=pV8czQcodc3I%2BQEvY8zSf9tt7X5Jv9AhbULOuJAizHI%3D\u0026sid=c46efe9b-d3d2-4a0c-8c76-bfafa16c5add\u0026ts=1777878094"}],"max_age":3600}
reporting-endpoints: heroku-nel="https://nel.heroku.com/reports?s=pV8czQcodc3I%2BQEvY8zSf9tt7X5Jv9AhbULOuJAizHI%3D&sid=c46efe9b-d3d2-4a0c-8c76-bfafa16c5add&ts=1777878094"
via: 2.0 heroku-router
x-download-options: noopen
x-permitted-cross-domain-policies: none
x-request-id: d2c891c3-fe63-aa3b-b286-55fe82e92bec

Recommendations

Enable compression (gzip/brotli) to improve performance