HTTP Headers Analysis for https://www.ably.io

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

0.149113

server: cloudflare
x-runtime: 0.149113

CORS Headers

No CORS headers found

Cookies Headers

Set-Cookie

Cookies

set-cookie: ably_device_id=btsc%2FEDsbxRJ8Ocag%2FSDkt9zkHJjpKa0MbV%2FDW2E6lTlmggjiX9Nc4CPMkMXKG1Ky6VyCGKG%2BvvTX092dJucfNDC83enS86NyAtkijy3bE467xVPgiT5q%2BDNDodWvHlBYq2oCccVfhFuKiNcR2jTv5URJ4XL3f9rL53Xic4yS3gw%2FppiJ%2B2WbSY2zqQ%3D--ggHyCIKVGgbc%2FNIm--zMLkyYG6jyz2rlGkKZd0lw%3D%3D; path=/; expires=Sat, 01 May 2027 15:16:21 GMT; HttpOnly; SameSite=Lax; secure
_ably_session=JIvEZKO1eBNH9qVnqEy5vBJY56dJkzNV2rjkFhT2rQIgisRjps%2B%2FMe7uswekRIbm2K2J%2FBjaj7NzxRuUaw3rZ%2FZzX64V7E2K16JD8PdIYK9zUSXQhVQd5ZbRYFJn6qoOsG%2BrpMHc8L6E5P%2FDoPPgRXYNsK%2Ff3DlbYXYx2MsJs1PHzewqCCpdwSmqq2HtKDj2gNrdPG7PbeRY4045uzkaK3rPCJ4W59w0LfP2GcvpLSxg4keq7UjaeLWHyd%2B8bJqijTjtjdeVhmmW1Xbx%2F6H6k1tqm5laFIuZ959KYo7aMfucLuBJJkj3XyVNCswwR3LAijb1hlUY5O0NPSH1CiXrckF%2BTCE4ieQ%3D--vMPa87qxBIDjBjaM--J7lsiB5bUOs0gpf7j9TuAg%3D%3D; path=/; expires=Fri, 01 May 2026 17:16:21 GMT; secure; HttpOnly; SameSite=Lax

Other Headers

Cf-Cache-Status

Other

BYPASS

Cf-Ray

Other

9f4fbf300b4e5934-IAD

Date

Other

Fri, 01 May 2026 15:16:21 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=vCtEvQ7UAXj%2FFjXH3wiFtcduyKQ2QRxQ%2Bb%2F0WUGjhcc%3D&sid=c46efe9b-d3d2-4a0c-8c76-bfafa16c5add&ts=1777648581

Reporting-Endpoints

Other

heroku-nel="https://nel.heroku.com/reports?s=vCtEvQ7UAXj%2FFjXH3wiFtcduyKQ2QRxQ%2Bb%2F0WUGjhcc%3D&sid=c46efe9b-d3d2-4a0c-8c76-bfafa16c5add&ts=1777648581"

Via

Other

2.0 heroku-router

X-Download-Options

Other

noopen

X-Permitted-Cross-Domain-Policies

Other

none

X-Request-Id

Other

82d14fe7-8cb1-1135-65f8-76d6b2626765

cf-cache-status: BYPASS
cf-ray: 9f4fbf300b4e5934-IAD
date: Fri, 01 May 2026 15:16:21 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=vCtEvQ7UAXj%2FFjXH3wiFtcduyKQ2QRxQ%2Bb%2F0WUGjhcc%3D\u0026sid=c46efe9b-d3d2-4a0c-8c76-bfafa16c5add\u0026ts=1777648581"}],"max_age":3600}
reporting-endpoints: heroku-nel="https://nel.heroku.com/reports?s=vCtEvQ7UAXj%2FFjXH3wiFtcduyKQ2QRxQ%2Bb%2F0WUGjhcc%3D&sid=c46efe9b-d3d2-4a0c-8c76-bfafa16c5add&ts=1777648581"
via: 2.0 heroku-router
x-download-options: noopen
x-permitted-cross-domain-policies: none
x-request-id: 82d14fe7-8cb1-1135-65f8-76d6b2626765

Recommendations

Enable compression (gzip/brotli) to improve performance