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