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-Edge-Origin-Shield-Skipped
X-Xss-Protection
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-Dns-Prefetch-Control
X-Cache-Hits
X-Varnish
X-Amz-Request-Id
X-Amz-Id-2
Access-Control-Allow-Credentials
P3P
X-Runtime
X-Served-By
X-Cacheable
X-Meli-Trace-Bu
X-Meli-Trace-Platform
X-Meli-Trace-Site
X-D2id
X-Request-Device-Id
Permissions-Policy
X-Vhost
X-Dispatcher
X-Element-Page-Cache
X-Content-Type
X-Navigation-Version
X-Generator
X-AspNet-Version
CF-RAY
CF-Cache-Status
Report-To
Feature-Policy
Status
X-Drupal-Cache
NEL
Accept-Ch
Server-Timing
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
X-Amz-Replication-Status
Accept-CH-Lifetime
Xkey
X-WebKit-CSP
X-Amz-Rid
X-AspNetMvc-Version
Content-Encoding
X-Cacheable-TTL
X-Timer
X-ProcessESI
X-RemovedCookies
X-T
X-Cache-Status
Xet-Cookie
X-Timing-Wait
X-Proxy-Build
Selected-Fe
X-Adblock-Key
Front
Apigw-Requestid
X-Page-Speed
X-Hl-Ver
X-Backend-Server
X-Request-Processing-Time
X-Request-Received
X-AH-Environment
CloudFront-Viewer-Country
AMP-Access-Control-Allow-Source-Origin
X-SharePointHealthScore
SPRequestDuration
Request-Id
SPIisLatency
SPRequestGuid
X-MS-InvokeApp
X-BYPASS-REASON
X-ProxyCache-Status
X-Robots-Tag
X-ProxyCache-Key
MicrosoftSharePointTeamServices
Mail-Subject
Countrycode
We-Hiring
Expect-Staple
X-Clientip
X-Device
X-Host
X-Mly-Id
Grace
X-SRCache-Store-Status
X-SRCache-Key
X-Correlation-Id
X-SRCache-Fetch-Status
X-Oneagent-Js-Injection
X-Ruxit-Js-Agent
Critical-Ch
X-Viewer-Country
X-Rq
X-Mod-Pagespeed
X-Age
X-Amz-Apigw-Id
X-Amzn-RequestId
X-NODE
Surrogate-Control
X-Via
X-URL
X-Iinfo
Expect-Ct
X-Cache-FS-Status
X-CDN
X-Api-Version
X-Ws-Request-Id
X-Vc
Cloudfront-Viewer-Country
X-Turbo-Charged-By
Timing-Allow-Origin
X-VC
Cf-Edge-Cache
X-Node
X-Redirect
Request-Context
X-LiteSpeed-Cache
Protected
Cf-Apo-Via
X-Azure-Ref
Fastly-Restarts
X-Readtime
X-Server-Id
X-User
X-Provided-By
X-Server-Powered-By
EagleId
X-Cache-Group
X-Cache-Time
X-Cdn
X-Styx-Req-Id
X-Pantheon-Styx-Hostname
Content-Location
X-OneAgent-JS-Injection
X-Ruxit-JS-Agent
X-Cache-TTL
X-Litespeed-Cache