HTTP Headers Analysis for https://ably.net

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

0.176157

server: cloudflare
x-runtime: 0.176157

CORS Headers

No CORS headers found

Cookies Headers

Set-Cookie

Cookies

set-cookie: ably_device_id=W%2F%2B8onkxj%2BRKYMyPPy3oHOnW1lsA4oocUgmqltcgwzCXwDnpzMi3p6%2FSmI4oJoj8YftYbEjMaBgl89S2u226O%2B8BHKhWvRnmLAI%2BPxwKQKlc20WMbCgoeyH6Hd8%2BBL%2FpOF3kjQWcU3BMtjXucPnu4DUEeVOFaMtPur%2FiP%2FMgv3wIZWSIVuvkZrNsvJs%3D--SkjPJYtduRpg%2FqcI--t4hlshG9H7A33tDGOXdl7A%3D%3D; path=/; expires=Sat, 24 Apr 2027 18:47:50 GMT; HttpOnly; SameSite=Lax; secure
_ably_session=h9gw22fepe%2FT48zX7lTovOPv9Pzu3CtAi7I7wxX7PzDILm887mvselFIOMbV0W2ixNRBsWgHg5MX9tjUJsCvIaglQS25%2BziFhoYCWigFPNtI%2BFYeKQN5GFL9ZAuaFgalz06dM4uGODgDvLRVgit8PduImVzBFNsD8KjMRazw2EyGGouatYoILbWAtRe3wyjOW29mpezMnz8XtbxFltS%2FTAlrb29VwFRtEyoXpkNzYg4F93ycXzJcAoFtlkYLNnrXSa6Yohvnw63%2FrIj%2BgDI9lChDfvnkaPemJj50Hha57%2BtpCMIwP2Fy7mHcqx7x6NgU1ApSsWjv26hwtSwRFAbECRW8aP0JNzk%3D--Our%2Fcq%2Bmc7ISko5e--Zw3%2FT%2BJoumAS%2BXqxz1yRPg%3D%3D; path=/; expires=Fri, 24 Apr 2026 20:47:50 GMT; secure; HttpOnly; SameSite=Lax

Other Headers

Cf-Cache-Status

Other

BYPASS

Cf-Ray

Other

9f1747591830e63a-IAD

Date

Other

Fri, 24 Apr 2026 18:47:50 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=0BzjdlZ7T7UbDCYXAokP%2Fa50tCAJvrfsDIuNQAGy5MM%3D&sid=c46efe9b-d3d2-4a0c-8c76-bfafa16c5add&ts=1777056469

Reporting-Endpoints

Other

heroku-nel="https://nel.heroku.com/reports?s=0BzjdlZ7T7UbDCYXAokP%2Fa50tCAJvrfsDIuNQAGy5MM%3D&sid=c46efe9b-d3d2-4a0c-8c76-bfafa16c5add&ts=1777056469"

Via

Other

2.0 heroku-router

X-Download-Options

Other

noopen

X-Permitted-Cross-Domain-Policies

Other

none

X-Request-Id

Other

c2cb30c3-07e8-36fb-eda6-4f0cad8a4f50

cf-cache-status: BYPASS
cf-ray: 9f1747591830e63a-IAD
date: Fri, 24 Apr 2026 18:47:50 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=0BzjdlZ7T7UbDCYXAokP%2Fa50tCAJvrfsDIuNQAGy5MM%3D\u0026sid=c46efe9b-d3d2-4a0c-8c76-bfafa16c5add\u0026ts=1777056469"}],"max_age":3600}
reporting-endpoints: heroku-nel="https://nel.heroku.com/reports?s=0BzjdlZ7T7UbDCYXAokP%2Fa50tCAJvrfsDIuNQAGy5MM%3D&sid=c46efe9b-d3d2-4a0c-8c76-bfafa16c5add&ts=1777056469"
via: 2.0 heroku-router
x-download-options: noopen
x-permitted-cross-domain-policies: none
x-request-id: c2cb30c3-07e8-36fb-eda6-4f0cad8a4f50

Recommendations

Enable compression (gzip/brotli) to improve performance