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-Dns-Prefetch-Control
X-Permitted-Cross-Domain-Policies
Content-Security-Policy-Report-Only
X-Envoy-Upstream-Service-Time
X-Amz-Request-Id
X-Amz-Id-2
X-Varnish
X-Cache-Hits
Access-Control-Allow-Credentials
P3P
X-Edge-Origin-Shield-Skipped
X-Runtime
X-DNS-Prefetch-Control
X-Cacheable
X-Meli-Trace-Platform
X-Meli-Trace-Site
X-Meli-Trace-Bu
X-Request-Device-Id
X-D2id
X-Content-Type
X-Element-Page-Cache
X-Dispatcher
X-Vhost
Accept-Ch
X-Served-By
Expect-CT
X-Navigation-Version
Permissions-Policy
Accept-Ch-Lifetime
X-AspNet-Version
Feature-Policy
X-Generator
Status
X-Drupal-Cache
Server-Timing
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
Report-To
X-T
X-Varnish-Cache
X-WebKit-CSP
X-AspNetMvc-Version
X-Cacheable-TTL
X-Amz-Rid
NEL
Xkey
Content-Encoding
X-RemovedCookies
X-ProcessESI
Xet-Cookie
X-Request-Processing-Time
X-Request-Received
Selected-Fe
X-Proxy-Build
X-Timing-Wait
X-Timer
Front
X-Hl-Ver
Apigw-Requestid
X-Page-Speed
X-Backend-Server
X-BYPASS-REASON
X-ProxyCache-Status
X-ProxyCache-Key
CF-RAY
CF-Cache-Status
Accept-CH
X-Cache-Status
CloudFront-Viewer-Country
AMP-Access-Control-Allow-Source-Origin
Mail-Subject
X-SRCache-Key
Expect-Staple
We-Hiring
X-Correlation-Id
X-Robots-Tag
X-Ruxit-Js-Agent
X-SRCache-Fetch-Status
X-Oneagent-Js-Injection
Countrycode
X-Device
X-Clientip
X-SRCache-Store-Status
SPIisLatency
X-SharePointHealthScore
SPRequestDuration
SPRequestGuid
X-AH-Environment
MicrosoftSharePointTeamServices
Request-Id
X-MS-InvokeApp
Grace
X-Mly-Id
X-NODE
Critical-Ch
X-Amzn-RequestId
X-Amz-Apigw-Id
X-Host
X-Age
Surrogate-Control
Alt-Svc
X-Mod-Pagespeed
X-Viewer-Country
X-Rq
X-Request-ID
X-URL
X-Cache-FS-Status
X-Vc
Expect-Ct
Accept-CH-Lifetime
X-Api-Version
Cloudfront-Viewer-Country
X-VC
X-Adblock-Key
X-Redis-Cache
Edge-Cache-Tag
X-Iinfo
X-CDN
X-Via
Timing-Allow-Origin
Protected
Request-Context
X-LiteSpeed-Cache
X-Turbo-Charged-By
X-Redirect
Cf-Edge-Cache
X-Node