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