HTTP Headers Analysis for https://dev.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

0.242398

server: cloudflare
x-runtime: 0.242398

CORS Headers

No CORS headers found

Cookies Headers

Set-Cookie

Cookies

set-cookie: ably_device_id=m3%2FdzzxOeZnizDDRmPNi0aQ%2F9m2dqyYYhCPtIRoPcOd34wVdDHSlhBQJL4116SO2PyqjLE8N%2BuFSl0ZY4MqVWBxmRXJNqxTDTJVvjEys6XmyWXGsdE8cxy8dNfgqN62mrPyP5sxm8iy4%2Fgvx%2FeqJ%2BWr0EwjGJ57AccKV7VyIZYrMGnbXQPxzncl2vJE%3D--Sdv1yV6j7IaC3WPl--PxExVaBNWt27G%2F%2BxgMtpoQ%3D%3D; path=/; expires=Fri, 07 May 2027 06:19:08 GMT; HttpOnly; SameSite=Lax; secure
_ably_session=abrwl%2BZSsVxh43Jt9AqbB8WBzzZNTnqrl%2Bq4UYT%2F67pYd6eylPSGp5skY65HOUFo4dNdwN7irfkHvy%2B%2FVnF%2BW%2FWUHRA9GgipbU%2FPZYjiblmyaPwJHWVmVXCPHrxRZopENJ6dCX28qjOnEU3Vwblr4HIS5SWA%2BCdqMWDW3ZewvX085NysedchFPm%2FSmocYNEDZzLOsAsoSvAiz%2FaMoABzXGtg4hM2%2Ba%2FaBX6HNmiozcb3%2BrMZcrc7b5D4ubtEOQdwrhsVBKJMIKsOW9rbtlYnTKnKb3kN5CrjvrzxBSG5V74KyD1bkuHbjeKt8L3WIV%2FsirGd%2BA4NGGug5qG%2B%2BZtjOWIhdEP%2BVMA%3D--ay6GybsFwUBfHQQS--3aKXSvROEJYuOnAJDSbqkw%3D%3D; path=/; expires=Thu, 07 May 2026 08:19:08 GMT; secure; HttpOnly; SameSite=Lax

Other Headers

Cf-Cache-Status

Other

BYPASS

Cf-Ray

Other

9f7e1c800d7ec93c-IAD

Date

Other

Thu, 07 May 2026 06:19:08 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=SSgSZlO0KvFqD2J1SLdwE6pHe85sU0zBi2%2F7itf0cjY%3D&sid=c46efe9b-d3d2-4a0c-8c76-bfafa16c5add&ts=1778134748

Reporting-Endpoints

Other

heroku-nel="https://nel.heroku.com/reports?s=SSgSZlO0KvFqD2J1SLdwE6pHe85sU0zBi2%2F7itf0cjY%3D&sid=c46efe9b-d3d2-4a0c-8c76-bfafa16c5add&ts=1778134748"

Via

Other

2.0 heroku-router

X-Download-Options

Other

noopen

X-Permitted-Cross-Domain-Policies

Other

none

X-Request-Id

Other

545d041b-a37c-6fa8-c239-bdaf6b9678c7

cf-cache-status: BYPASS
cf-ray: 9f7e1c800d7ec93c-IAD
date: Thu, 07 May 2026 06:19:08 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=SSgSZlO0KvFqD2J1SLdwE6pHe85sU0zBi2%2F7itf0cjY%3D\u0026sid=c46efe9b-d3d2-4a0c-8c76-bfafa16c5add\u0026ts=1778134748"}],"max_age":3600}
reporting-endpoints: heroku-nel="https://nel.heroku.com/reports?s=SSgSZlO0KvFqD2J1SLdwE6pHe85sU0zBi2%2F7itf0cjY%3D&sid=c46efe9b-d3d2-4a0c-8c76-bfafa16c5add&ts=1778134748"
via: 2.0 heroku-router
x-download-options: noopen
x-permitted-cross-domain-policies: none
x-request-id: 545d041b-a37c-6fa8-c239-bdaf6b9678c7

Recommendations

Enable compression (gzip/brotli) to improve performance