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-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
X-DNS-Prefetch-Control
Expect-CT
X-Envoy-Upstream-Service-Time
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-Meli-Trace-Platform
X-D2id
X-Request-Device-Id
X-Meli-Trace-Bu
X-Meli-Trace-Site
Report-To
X-Vhost
X-Dispatcher
X-Element-Page-Cache
X-Content-Type
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-ProcessESI
X-RemovedCookies
X-Cacheable-TTL
X-Cache-Status
Xet-Cookie
X-T
X-Timing-Wait
Selected-Fe
X-Proxy-Build
Front
Apigw-Requestid
X-Page-Speed
X-Hl-Ver
X-Backend-Server
SPRequestGuid
X-MS-InvokeApp
X-AH-Environment
SPRequestDuration
X-SharePointHealthScore
Request-Id
SPIisLatency
AMP-Access-Control-Allow-Source-Origin
CloudFront-Viewer-Country
X-Robots-Tag
X-Request-Received
X-Request-Processing-Time
MicrosoftSharePointTeamServices
X-SRCache-Fetch-Status
X-SRCache-Key
X-SRCache-Store-Status
X-Mly-Id
X-Host
Mail-Subject
Countrycode
X-Clientip
Expect-Staple
X-Correlation-Id
X-Device
We-Hiring
X-BYPASS-REASON
X-ProxyCache-Key
X-ProxyCache-Status
X-Viewer-Country
Grace
Critical-Ch
X-Rq
X-Mod-Pagespeed
X-Ruxit-Js-Agent
X-Oneagent-Js-Injection
X-Iinfo
X-Via
X-Amzn-RequestId
X-Amz-Apigw-Id
X-Age
X-NODE
X-CDN
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
Cf-Edge-Cache
X-VC
X-Vc
X-Redirect
P3p
X-Node
Request-Context
X-LiteSpeed-Cache
Protected
X-OneAgent-JS-Injection
Fastly-Restarts
Cf-Apo-Via
X-Azure-Ref
X-Server-Powered-By
X-Server-Id
X-User
X-Provided-By
X-Readtime
X-Ruxit-JS-Agent
EagleId
X-Cache-Time
X-Cache-Group
X-Styx-Req-Id
X-Cache-TTL
X-Pantheon-Styx-Hostname
Content-Location
X-Debug-Info
X-HW
X-Status
X-CST
Liferay-Portal
Resin-Trace
Allow
X-Cdn
X-Litespeed-Cache