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