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