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