HTTP Headers Analysis for https://developers.facebook.com

Detected Technologies from Headers

See all in URL Inspect 15

Facebook

GIPHY

Google Analytics

Google Conversion Tracking

Google DoubleClick

Google Fonts

Google Search

Google Tag Manager

Google Translate

Instagram

Tenor

Trustly

Twitter

HTTP Security Headers

Status

Strict-Transport-Security

Present

max-age=15552000; preload

Content-Security-Policy

Basic

default-src; script-src; style-src; +11 more Analyze

Content-Security-Policy-Report-Only

Missing

Not configured Analyze

X-Frame-Options

Excellent

DENY

X-Content-Type-Options

Good

nosniff

Referrer-Policy

Missing

Not configured

Permissions-Policy

Present

accelerometer=(), attribution-reporting=(), autoplay=(); +44 more

Recommendations

• Increase HSTS max-age to at least 1 year and add includeSubDomains
• Improve CSP by adding more specific directives and removing 'unsafe-inline'
• Add Referrer-Policy header (recommended: strict-origin-when-cross-origin)

Performance Headers

Connection

Performance

close

Transfer-Encoding

Performance

chunked

Vary

Performance

Accept-Encoding

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

Caching Headers

Cache-Control

Caching

private, no-cache, no-store, must-revalidate

Expires

Caching

Sat, 01 Jan 2000 00:00:00 GMT

Pragma

Caching

no-cache

cache-control: private, no-cache, no-store, must-revalidate
expires: Sat, 01 Jan 2000 00:00:00 GMT
pragma: no-cache

Content Headers

Content-Type

Content

text/html; charset="utf-8"

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

Server Headers

No server headers found

CORS Headers

No CORS headers found

Cookies Headers

No cookies headers found

Other Headers

Cross-Origin-Embedder-Policy-Report-Only

Other

require-corp;report-to="coep_report"

Date

Other

Sat, 04 Apr 2026 09:23:24 GMT

Document-Policy

Other

force-load-at-top, include-js-call-stacks-in-crash-reports

Origin-Agent-Cluster

Other

?1

Report-To

Other

Group coop_report max-age: 4w

Endpoint 1 https://www.facebook.com/browser_reporting/coop/?minimize=0

Group coep_report max-age: 1d

Endpoint 1 https://www.facebook.com/browser_reporting/coep/?minimize=0

Group permissions_policy max-age: 6h

Endpoint 1 https://www.facebook.com/ajax/browser_error_reports/

Reporting-Endpoints

Other

coop_report="https://www.facebook.com/browser_reporting/coop/?minimize=0", coep_report="https://www.facebook.com/browser_reporting/coep/?minimize=0", permissions_policy="https://www.facebook.com/ajax/browser_error_reports/"

X-Fb-Debug

Other

lzSiR7su2qmlFiIXTbHMJLe+7ldvuf2o/+wlScEdiQAt/bHFBC1bwXUP2u98vkkjcTLStldn4ZDG3lwekLb8CA==

cross-origin-embedder-policy-report-only: require-corp;report-to="coep_report"
date: Sat, 04 Apr 2026 09:23:24 GMT
document-policy: force-load-at-top, include-js-call-stacks-in-crash-reports
origin-agent-cluster: ?1
report-to: {"max_age":2592000,"endpoints":[{"url":"https:\/\/www.facebook.com\/browser_reporting\/coop\/?minimize=0"}],"group":"coop_report","include_subdomains":true}, {"max_age":86400,"endpoints":[{"url":"https:\/\/www.facebook.com\/browser_reporting\/coep\/?minimize=0"}],"group":"coep_report"}, {"max_age":21600,"endpoints":[{"url":"https:\/\/www.facebook.com\/ajax\/browser_error_reports\/"}],"group":"permissions_policy"}
reporting-endpoints: coop_report="https://www.facebook.com/browser_reporting/coop/?minimize=0", coep_report="https://www.facebook.com/browser_reporting/coep/?minimize=0", permissions_policy="https://www.facebook.com/ajax/browser_error_reports/"
x-fb-debug: lzSiR7su2qmlFiIXTbHMJLe+7ldvuf2o/+wlScEdiQAt/bHFBC1bwXUP2u98vkkjcTLStldn4ZDG3lwekLb8CA==

Recommendations

Enable compression (gzip/brotli) to improve performance