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