Threat Level: green Handler on Duty: Didier Stevens

SANS ISC: HTTP Header Usage Statistics HTTP Header Usage Statistics


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This is a continuation of work started by Brough Davis as part of his software security project for his Masters in Information Security Engineering. The main goal of this project is to find how many sites use security relevant headers, like for example the X-XSS-Protection or X-Frame-Options headers.

Below you will find a table/histogram showing how many times we found each header (security relevant or not). We access the index page of each site using a "head" request. The list of sites is derived from Alexa's Top 1 Million sites. We try to poll as many sites as possible each day.

As we collect more data, we will plot changes over time.



All Headers Active In The Past Month
Header Popularity
Set-Cookie
X-Cache
Date
Connection
Content-Type
X-Amz-Cf-Pop
Via
X-Amz-Cf-Id
Vary
Server
Cache-Control
Content-Length
ETag
X-Frame-Options
X-Content-Type-Options
Strict-Transport-Security
X-Cache-Lookup
Age
Expires
Last-Modified
Accept-Ranges
Link
X-Powered-By
X-XSS-Protection
Content-Security-Policy
Referrer-Policy
X-Xss-Protection
X-Edge-Origin-Shield-Skipped
Pragma
Access-Control-Allow-Origin
X-Download-Options
X-Request-Id
Content-Language
Access-Control-Allow-Methods
Access-Control-Allow-Headers
X-Amz-Version-Id
X-UA-Compatible
X-Permitted-Cross-Domain-Policies
Content-Security-Policy-Report-Only
Accept-CH
X-Envoy-Upstream-Service-Time
X-DNS-Prefetch-Control
Expect-CT
X-Varnish
X-Cache-Hits
X-Dns-Prefetch-Control
X-Amz-Id-2
X-Amz-Request-Id
Access-Control-Allow-Credentials
P3P
X-Runtime
X-Served-By
X-Cacheable
X-Meli-Trace-Site
X-Request-Device-Id
X-Meli-Trace-Platform
X-Meli-Trace-Bu
X-D2id
Permissions-Policy
X-Vhost
X-Dispatcher
X-Element-Page-Cache
X-Content-Type
X-Navigation-Version
CF-RAY
CF-Cache-Status
X-Generator
X-AspNet-Version
Report-To
Feature-Policy
NEL
X-Drupal-Cache
Status
Server-Timing
Accept-Ch
Accept-Ch-Lifetime
Access-Control-Max-Age
X-Drupal-Dynamic-Cache
X-Proxy-Cache
Alt-Svc
X-Server
X-Backend
Access-Control-Expose-Headers
X-Content-Security-Policy
Cache-Tag
X-Amz-Server-Side-Encryption
X-Amzn-Trace-Id
X-Varnish-Cache
Accept-CH-Lifetime
Xkey
X-Amz-Replication-Status
X-WebKit-CSP
X-Amz-Rid
X-AspNetMvc-Version
Content-Encoding
X-Timer
X-RemovedCookies
X-ProcessESI
X-Cacheable-TTL
X-T
X-Cache-Status
Xet-Cookie
X-Adblock-Key
Selected-Fe
X-Proxy-Build
X-Timing-Wait
Front
Apigw-Requestid
X-Page-Speed
X-Hl-Ver
X-Backend-Server
X-Request-Processing-Time
X-Request-Received
X-SharePointHealthScore
X-MS-InvokeApp
X-AH-Environment
SPRequestDuration
AMP-Access-Control-Allow-Source-Origin
Request-Id
SPIisLatency
SPRequestGuid
CloudFront-Viewer-Country
X-Robots-Tag
X-ProxyCache-Key
X-ProxyCache-Status
MicrosoftSharePointTeamServices
X-BYPASS-REASON
X-Device
Countrycode
X-SRCache-Key
X-SRCache-Store-Status
Expect-Staple
X-Correlation-Id
X-SRCache-Fetch-Status
We-Hiring
Mail-Subject
X-Clientip
X-Mly-Id
X-Host
Grace
Critical-Ch
X-Viewer-Country
X-Rq
X-Ruxit-Js-Agent
X-Oneagent-Js-Injection
X-Mod-Pagespeed
X-Age
X-Amz-Apigw-Id
X-Amzn-RequestId
X-NODE
Surrogate-Control
X-Iinfo
X-Via
X-URL
X-CDN
Expect-Ct
X-Api-Version
X-Ws-Request-Id
X-Cache-FS-Status
Cloudfront-Viewer-Country
X-Turbo-Charged-By
X-Vc
Timing-Allow-Origin
X-VC
Cf-Edge-Cache
X-Redirect
P3p
X-Node
Request-Context
X-LiteSpeed-Cache
Protected
X-Azure-Ref
Fastly-Restarts
Cf-Apo-Via
X-Server-Powered-By
EagleId
X-Readtime
X-Provided-By
X-Ruxit-JS-Agent
X-OneAgent-JS-Injection
X-Cache-Group
X-User
X-Cache-Time
X-Server-Id
X-Pantheon-Styx-Hostname
X-Styx-Req-Id
X-Cache-TTL
Content-Location
X-Litespeed-Cache
X-Cdn
X-Status
Resin-Trace
X-Debug-Info