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