Threat Level: green Handler on Duty: Johannes Ullrich

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