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