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
Link
X-XSS-Protection
X-Powered-By
X-Cache-Lookup
Content-Security-Policy
Referrer-Policy
Access-Control-Allow-Origin
Pragma
X-Download-Options
X-Xss-Protection
X-Request-Id
Content-Language
X-Edge-Origin-Shield-Skipped
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-Served-By
X-Meli-Trace-Bu
X-D2id
X-Meli-Trace-Platform
X-Meli-Trace-Site
X-Request-Device-Id
X-Content-Type
X-Vhost
X-Dispatcher
X-Element-Page-Cache
Permissions-Policy
Accept-CH
X-Navigation-Version
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
Access-Control-Expose-Headers
X-Content-Security-Policy
X-Backend
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
Content-Encoding
X-RemovedCookies
X-ProcessESI
Xet-Cookie
X-Timer
X-Timing-Wait
Selected-Fe
X-Proxy-Build
Front
Apigw-Requestid
X-Request-Processing-Time
X-Request-Received
X-Page-Speed
X-Hl-Ver
X-Cache-Status
X-Backend-Server
X-BYPASS-REASON
X-ProxyCache-Key
X-ProxyCache-Status
Accept-CH-Lifetime
CloudFront-Viewer-Country
AMP-Access-Control-Allow-Source-Origin
X-AH-Environment
SPRequestDuration
Request-Id
SPIisLatency
X-SharePointHealthScore
X-MS-InvokeApp
SPRequestGuid
X-Correlation-Id
X-SRCache-Store-Status
We-Hiring
Mail-Subject
X-Device
X-Ruxit-Js-Agent
X-SRCache-Key
Expect-Staple
X-Robots-Tag
X-Oneagent-Js-Injection
X-SRCache-Fetch-Status
MicrosoftSharePointTeamServices
Countrycode
X-Clientip
Critical-Ch
Grace
X-Host
X-Mly-Id
X-Age
X-NODE
X-Mod-Pagespeed
X-Amzn-RequestId
Surrogate-Control
X-Rq
X-Amz-Apigw-Id
X-Viewer-Country
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-Redirect
X-Turbo-Charged-By
Protected
X-Node
Request-Context
Cf-Apo-Via
X-Readtime
X-Server-Id
X-Server-Powered-By
X-User
EagleId
X-Provided-By
Edge-Cache-Tag
Fastly-Restarts
X-Redis-Cache
X-Azure-Ref
X-Cdn
X-Cache-Time
X-Cache-Group