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