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