Threat Level: green Handler on Duty: Xavier Mertens

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
Date
Connection
Content-Type
X-Cache
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
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-Dns-Prefetch-Control
X-UA-Compatible
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
Access-Control-Allow-Credentials
X-Cache-Hits
P3P
X-Runtime
X-Cacheable
X-Content-Type
X-Element-Page-Cache
X-Meli-Trace-Bu
X-Meli-Trace-Platform
X-Meli-Trace-Site
X-Request-Device-Id
X-D2id
X-Dispatcher
X-Vhost
Accept-Ch
X-Served-By
X-DNS-Prefetch-Control
Accept-Ch-Lifetime
X-Navigation-Version
Permissions-Policy
Feature-Policy
Expect-CT
X-AspNet-Version
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-Cache-Lookup
X-Backend
Cache-Tag
X-Amzn-Trace-Id
X-Amz-Replication-Status
X-Amz-Server-Side-Encryption
X-T
X-Varnish-Cache
X-WebKit-CSP
X-Cacheable-TTL
X-AspNetMvc-Version
X-Request-Received
X-Request-Processing-Time
X-Amz-Rid
Content-Encoding
Xet-Cookie
X-ProcessESI
X-RemovedCookies
Xkey
X-ProxyCache-Key
Selected-Fe
X-ProxyCache-Status
X-Backend-Server
X-BYPASS-REASON
Front
X-Timing-Wait
X-Proxy-Build
X-Timer
X-Hl-Ver
Report-To
X-Page-Speed
Apigw-Requestid
CloudFront-Viewer-Country
X-Amz-Apigw-Id
X-Amzn-RequestId
X-Device
Grace
Mail-Subject
X-Correlation-Id
We-Hiring
X-Ruxit-Js-Agent
X-Clientip
Expect-Staple
Countrycode
X-SRCache-Store-Status
X-SRCache-Key
NEL
X-SRCache-Fetch-Status
X-Oneagent-Js-Injection
X-Robots-Tag
X-Cache-Status
X-MS-InvokeApp
X-AH-Environment
X-Mly-Id
X-Age
Request-Id
AMP-Access-Control-Allow-Source-Origin
X-SharePointHealthScore
X-NODE
Surrogate-Control
MicrosoftSharePointTeamServices
SPRequestGuid
SPRequestDuration
SPIisLatency
X-Host
Critical-Ch
X-Mod-Pagespeed
X-Cache-FS-Status
X-URL
X-Viewer-Country
X-Rq
X-Vc
X-Edge-Origin-Shield-Skipped
X-Api-Version
X-VC
Cloudfront-Viewer-Country
Edge-Cache-Tag
X-Redis-Cache
CF-RAY
CF-Cache-Status
X-Node