Threat Level: green Handler on Duty: Xavier Mertens

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