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
X-XSS-Protection
Link
X-Powered-By
X-Cache-Lookup
Content-Security-Policy
Referrer-Policy
Access-Control-Allow-Origin
Pragma
X-Download-Options
X-Xss-Protection
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-Id-2
X-Amz-Request-Id
X-DNS-Prefetch-Control
X-Cache-Hits
Access-Control-Allow-Credentials
P3P
X-Runtime
Expect-CT
X-Cacheable
X-D2id
X-Meli-Trace-Bu
X-Meli-Trace-Site
X-Meli-Trace-Platform
X-Request-Device-Id
X-Served-By
X-Content-Type
X-Element-Page-Cache
X-Dispatcher
X-Vhost
Permissions-Policy
X-Navigation-Version
Accept-CH
X-Generator
X-AspNet-Version
Feature-Policy
Accept-Ch
Status
Accept-Ch-Lifetime
X-Drupal-Cache
Server-Timing
Access-Control-Max-Age
X-Proxy-Cache
X-Drupal-Dynamic-Cache
X-Server
Report-To
X-Backend
Access-Control-Expose-Headers
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-WebKit-CSP
X-T
Xkey
X-AspNetMvc-Version
X-Amz-Rid
Alt-Svc
X-Cacheable-TTL
X-RemovedCookies
X-ProcessESI
Content-Encoding
Xet-Cookie
X-Timer
Selected-Fe
X-Proxy-Build
X-Timing-Wait
Front
Apigw-Requestid
X-Hl-Ver
X-Page-Speed
X-Request-Processing-Time
X-Cache-Status
X-Request-Received
Accept-CH-Lifetime
X-Backend-Server
X-ProxyCache-Key
X-ProxyCache-Status
X-BYPASS-REASON
CloudFront-Viewer-Country
AMP-Access-Control-Allow-Source-Origin
X-SharePointHealthScore
X-AH-Environment
X-MS-InvokeApp
SPIisLatency
Request-Id
SPRequestGuid
SPRequestDuration
X-Correlation-Id
X-Clientip
Mail-Subject
X-Device
Expect-Staple
X-Ruxit-Js-Agent
X-SRCache-Key
X-SRCache-Store-Status
X-SRCache-Fetch-Status
Countrycode
X-Robots-Tag
X-Oneagent-Js-Injection
We-Hiring
MicrosoftSharePointTeamServices
Grace
Critical-Ch
X-Host
X-Mly-Id
X-Age
X-NODE
X-Viewer-Country
X-Mod-Pagespeed
X-Amzn-RequestId
X-Amz-Apigw-Id
Surrogate-Control
X-Rq
X-Adblock-Key
X-URL
Expect-Ct
X-Cache-FS-Status
X-Vc
X-Ua-Compatible
X-Api-Version
Cloudfront-Viewer-Country
X-VC
X-Via
P3p
X-Iinfo
X-CDN
X-Ws-Request-Id
Timing-Allow-Origin
Cf-Edge-Cache
X-LiteSpeed-Cache
Protected
Request-Context
X-Turbo-Charged-By
X-Redirect
X-Azure-Ref
Cf-Apo-Via
Fastly-Restarts
X-Node
X-Readtime
X-Server-Id
X-Server-Powered-By
X-Provided-By
EagleId
Edge-Cache-Tag
X-Redis-Cache
X-User
X-Cdn
X-Cache-Time