Threat Level: green Handler on Duty: Xavier Mertens

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
Age
Expires
Last-Modified
X-Cache-Lookup
Accept-Ranges
Link
X-XSS-Protection
X-Powered-By
Content-Security-Policy
Referrer-Policy
Pragma
Access-Control-Allow-Origin
X-Xss-Protection
X-Download-Options
X-Edge-Origin-Shield-Skipped
X-Request-Id
Content-Language
Access-Control-Allow-Headers
Access-Control-Allow-Methods
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
X-Cache-Hits
X-Amz-Id-2
X-Amz-Request-Id
Access-Control-Allow-Credentials
P3P
Expect-CT
X-Runtime
Accept-CH
X-Served-By
X-Cacheable
X-D2id
X-Meli-Trace-Bu
X-Request-Device-Id
X-Meli-Trace-Site
X-Meli-Trace-Platform
X-Element-Page-Cache
X-Content-Type
X-Dispatcher
X-Vhost
Permissions-Policy
X-Navigation-Version
X-Generator
X-AspNet-Version
Feature-Policy
Accept-Ch
Status
X-Drupal-Cache
Accept-Ch-Lifetime
Server-Timing
Access-Control-Max-Age
X-Proxy-Cache
Report-To
X-Drupal-Dynamic-Cache
CF-Cache-Status
CF-RAY
X-Server
NEL
X-Backend
Access-Control-Expose-Headers
X-Content-Security-Policy
Cache-Tag
X-Amz-Server-Side-Encryption
X-Amzn-Trace-Id
Alt-Svc
X-Varnish-Cache
X-Amz-Replication-Status
X-WebKit-CSP
Xkey
X-AspNetMvc-Version
X-Amz-Rid
X-T
X-Cacheable-TTL
Content-Encoding
X-RemovedCookies
X-ProcessESI
X-Timer
Xet-Cookie
Accept-CH-Lifetime
X-Proxy-Build
Selected-Fe
X-Timing-Wait
Front
X-Cache-Status
Apigw-Requestid
X-Hl-Ver
X-Page-Speed
X-Request-Received
X-Request-Processing-Time
X-Backend-Server
X-ProxyCache-Status
X-BYPASS-REASON
X-ProxyCache-Key
AMP-Access-Control-Allow-Source-Origin
CloudFront-Viewer-Country
X-AH-Environment
SPIisLatency
SPRequestDuration
SPRequestGuid
Request-Id
X-SharePointHealthScore
X-MS-InvokeApp
X-Ruxit-Js-Agent
X-Oneagent-Js-Injection
Mail-Subject
We-Hiring
Expect-Staple
Countrycode
MicrosoftSharePointTeamServices
X-Clientip
X-SRCache-Store-Status
X-Correlation-Id
X-SRCache-Fetch-Status
X-Robots-Tag
X-Device
X-SRCache-Key
Grace
X-Adblock-Key
X-Mly-Id
X-Host
Critical-Ch
X-Viewer-Country
X-Mod-Pagespeed
X-Age
X-NODE
X-Rq
X-Amzn-RequestId
X-Amz-Apigw-Id
Surrogate-Control
X-URL
Expect-Ct
X-Cache-FS-Status
X-Vc
Cloudfront-Viewer-Country
X-Via
X-Api-Version
X-Iinfo
X-VC
X-Ws-Request-Id
Timing-Allow-Origin
X-CDN
X-Node
Cf-Edge-Cache
X-Redirect
X-Turbo-Charged-By
Protected
Request-Context
X-Cdn
X-LiteSpeed-Cache
X-Azure-Ref
Fastly-Restarts
Cf-Apo-Via
X-Server-Id
X-Server-Powered-By
X-User
X-Readtime
X-Provided-By
EagleId
X-Cache-Time
Edge-Cache-Tag
X-Cache-Group
X-Redis-Cache
X-Litespeed-Cache
Content-Location
X-Cache-TTL