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