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