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
Accept-Ranges
X-XSS-Protection
Link
X-Powered-By
Content-Security-Policy
Referrer-Policy
X-Cache-Lookup
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-Amz-Id-2
X-Amz-Request-Id
X-Varnish
X-Cache-Hits
Access-Control-Allow-Credentials
X-DNS-Prefetch-Control
P3P
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-Content-Type
X-Element-Page-Cache
X-Vhost
X-Dispatcher
X-Served-By
Permissions-Policy
X-Navigation-Version
X-Generator
X-AspNet-Version
Accept-Ch
Feature-Policy
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-Cache-Status
CF-RAY
X-AspNetMvc-Version
Xkey
X-Amz-Rid
X-Cacheable-TTL
Content-Encoding
X-RemovedCookies
X-ProcessESI
Xet-Cookie
X-Timer
Selected-Fe
X-Timing-Wait
X-Proxy-Build
Front
X-Request-Processing-Time
X-Request-Received
X-Hl-Ver
Alt-Svc
Apigw-Requestid
X-Page-Speed
X-Backend-Server
X-Cache-Status
X-BYPASS-REASON
X-ProxyCache-Key
X-ProxyCache-Status
CloudFront-Viewer-Country
AMP-Access-Control-Allow-Source-Origin
X-SRCache-Store-Status
X-AH-Environment
Countrycode
X-SRCache-Key
X-Ruxit-Js-Agent
X-SRCache-Fetch-Status
X-Clientip
Expect-Staple
X-Device
X-Correlation-Id
Mail-Subject
We-Hiring
X-Robots-Tag
X-Oneagent-Js-Injection
X-MS-InvokeApp
SPRequestGuid
X-SharePointHealthScore
SPRequestDuration
Request-Id
SPIisLatency
MicrosoftSharePointTeamServices
Grace
Accept-CH-Lifetime
Critical-Ch
X-Mly-Id
X-Host
X-NODE
X-Age
X-Mod-Pagespeed
X-Amzn-RequestId
X-Amz-Apigw-Id
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-Via
X-Iinfo
X-CDN
Timing-Allow-Origin
X-Node
Request-Context
Protected
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