Threat Level: green Handler on Duty: Jan Kopriva

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
Via
X-Amz-Cf-Pop
X-Amz-Cf-Id
Vary
Server
Cache-Control
Content-Length
ETag
X-Cache-Lookup
X-Frame-Options
X-Content-Type-Options
Strict-Transport-Security
Expires
Age
Last-Modified
Link
Accept-Ranges
X-Powered-By
X-XSS-Protection
Content-Security-Policy
Referrer-Policy
X-Edge-Origin-Shield-Skipped
X-Xss-Protection
Pragma
Access-Control-Allow-Origin
X-Download-Options
X-Request-Id
Content-Language
Accept-CH
Access-Control-Allow-Methods
Access-Control-Allow-Headers
X-Amz-Version-Id
X-UA-Compatible
Expect-CT
Content-Security-Policy-Report-Only
X-Permitted-Cross-Domain-Policies
X-DNS-Prefetch-Control
X-Envoy-Upstream-Service-Time
X-Varnish
X-Cache-Hits
Access-Control-Allow-Credentials
X-Amz-Request-Id
X-Amz-Id-2
CF-Cache-Status
CF-RAY
X-Dns-Prefetch-Control
P3P
X-Runtime
Report-To
X-Served-By
NEL
X-Cacheable
Permissions-Policy
X-Meli-Trace-Site
X-Request-Device-Id
X-Meli-Trace-Platform
X-D2id
X-Meli-Trace-Bu
X-Vhost
X-Dispatcher
X-Element-Page-Cache
X-Content-Type
X-Generator
X-Navigation-Version
X-AspNet-Version
Alt-Svc
Feature-Policy
X-Drupal-Cache
Status
Server-Timing
X-Drupal-Dynamic-Cache
Access-Control-Max-Age
Accept-Ch
X-Proxy-Cache
Accept-Ch-Lifetime
X-Server
X-Backend
Access-Control-Expose-Headers
X-Content-Security-Policy
Accept-CH-Lifetime
Cache-Tag
X-Amz-Server-Side-Encryption
X-Amzn-Trace-Id
X-Varnish-Cache
X-Adblock-Key
Xkey
X-Amz-Replication-Status
X-Timer
X-Amz-Rid
X-WebKit-CSP
Content-Encoding
X-AspNetMvc-Version
X-Cache-Status
X-RemovedCookies
X-ProcessESI
X-Cacheable-TTL
Xet-Cookie
X-T
X-Proxy-Build
X-Timing-Wait
Selected-Fe
Front
Apigw-Requestid
X-Page-Speed
X-Hl-Ver
SPRequestGuid
Request-Id
SPRequestDuration
SPIisLatency
X-SharePointHealthScore
X-Backend-Server
X-AH-Environment
X-MS-InvokeApp
AMP-Access-Control-Allow-Source-Origin
CloudFront-Viewer-Country
X-Robots-Tag
MicrosoftSharePointTeamServices
X-Mly-Id
X-Host
X-Correlation-Id
X-SRCache-Fetch-Status
Countrycode
X-Request-Received
X-Device
X-Clientip
X-SRCache-Key
X-SRCache-Store-Status
X-Request-Processing-Time
Expect-Staple
X-Iinfo
Grace
X-Rq
X-Viewer-Country
Mail-Subject
We-Hiring
Critical-Ch
X-Via
X-BYPASS-REASON
X-ProxyCache-Key
X-ProxyCache-Status
X-Mod-Pagespeed
X-CDN
X-Ruxit-Js-Agent
X-Age
X-Oneagent-Js-Injection
X-Amzn-RequestId
X-Amz-Apigw-Id
X-NODE
X-URL
Surrogate-Control
X-Turbo-Charged-By
X-Ws-Request-Id
X-Ua-Compatible
Timing-Allow-Origin
Expect-Ct
X-Api-Version
Cf-Edge-Cache
X-Node
Cloudfront-Viewer-Country
X-Redirect
X-Cache-FS-Status
X-LiteSpeed-Cache
X-VC
Request-Context
P3p
Protected
X-Vc
X-OneAgent-JS-Injection
Fastly-Restarts
X-Azure-Ref
X-Server-Powered-By
X-Readtime
X-User
X-Server-Id
EagleId
X-Provided-By
X-Ruxit-JS-Agent
Cf-Apo-Via
X-Cache-Group
X-Cache-Time
Content-Location
X-Cache-TTL
X-Styx-Req-Id
X-Pantheon-Styx-Hostname
X-CST
Allow
X-Status
X-HW
X-Debug-Info
Liferay-Portal
Resin-Trace
Cf-Railgun
X-Litespeed-Cache
X-Cdn
X-Ua-Device
X-Template
X-Country-Code
X-Language