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