Threat Level: green Handler on Duty: Scott Fendley

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
X-Cache
Set-Cookie
Date
Connection
Content-Type
X-Cache-Lookup
Vary
Server
Via
X-Amz-Cf-Pop
Cache-Control
X-Amz-Cf-Id
Content-Length
X-Frame-Options
X-Content-Type-Options
X-Edge-Origin-Shield-Skipped
ETag
Strict-Transport-Security
Expires
X-Powered-By
Last-Modified
Link
Age
Accept-Ranges
Content-Security-Policy
X-XSS-Protection
Referrer-Policy
Pragma
X-Xss-Protection
Accept-CH
Access-Control-Allow-Origin
X-Download-Options
Expect-CT
Content-Language
CF-RAY
CF-Cache-Status
X-Request-Id
Report-To
X-DNS-Prefetch-Control
NEL
Access-Control-Allow-Methods
Access-Control-Allow-Headers
Alt-Svc
X-UA-Compatible
X-Cache-Hits
X-Amz-Version-Id
X-Permitted-Cross-Domain-Policies
Content-Security-Policy-Report-Only
X-Envoy-Upstream-Service-Time
X-Varnish
Access-Control-Allow-Credentials
X-Served-By
EagleId
P3P
X-Runtime
Accept-CH-Lifetime
X-Amz-Request-Id
X-Amz-Id-2
X-Adblock-Key
Permissions-Policy
X-Generator
X-Cacheable
X-Vhost
X-Dispatcher
X-Meli-Trace-Site
X-Meli-Trace-Platform
X-D2id
X-Meli-Trace-Bu
X-Request-Device-Id
X-Drupal-Cache
X-Element-Page-Cache
X-Content-Type
X-Navigation-Version
X-Drupal-Dynamic-Cache
X-AspNet-Version
Server-Timing
Feature-Policy
Status
Access-Control-Max-Age
X-Backend
X-Timer
X-Content-Security-Policy
X-Server
Access-Control-Expose-Headers
X-Proxy-Cache
X-Cache-Status
X-Dns-Prefetch-Control
X-Iinfo
X-Via
X-Varnish-Cache
X-CDN
Content-Encoding
Cache-Tag
X-Amz-Server-Side-Encryption
X-Amzn-Trace-Id
Xkey
X-WebKit-CSP
X-AspNetMvc-Version
X-RemovedCookies
X-Amz-Rid
X-ProcessESI
X-Ws-Request-Id
X-Turbo-Charged-By
Request-Id
SPRequestGuid
X-SharePointHealthScore
SPIisLatency
SPRequestDuration
X-MS-InvokeApp
X-AH-Environment
Apigw-Requestid
Selected-Fe
X-Timing-Wait
X-Proxy-Build
AMP-Access-Control-Allow-Source-Origin
X-Cacheable-TTL
Timing-Allow-Origin
Xet-Cookie
Front
X-Amz-Replication-Status
X-Page-Speed
Accept-Ch
MicrosoftSharePointTeamServices
X-Robots-Tag
X-Aspnet-Version
Expect-Ct
Cf-Edge-Cache
X-Mly-Id
CloudFront-Viewer-Country
X-Node
X-Host
X-Device
X-SRCache-Fetch-Status
X-LiteSpeed-Cache
X-Mod-Pagespeed
Grace
X-SRCache-Store-Status
Expect-Staple
X-SRCache-Key
X-Redirect
X-Correlation-Id
X-Hl-Ver
Countrycode
X-Viewer-Country
X-Rq
X-Clientip
Mail-Subject
We-Hiring
Accept-Ch-Lifetime
Fastly-Restarts
X-OneAgent-JS-Injection
Protected
Request-Context
Cf-Apo-Via
X-Backend-Server
X-Provided-By
X-Age
X-Ruxit-JS-Agent
X-Cache-Group
X-Styx-Req-Id
X-Pantheon-Styx-Hostname
X-Azure-Ref
X-Readtime
X-Server-Powered-By
X-Cache-Time
X-User
X-Ruxit-Js-Agent
X-CST
X-Oneagent-Js-Injection
X-Server-Id
X-T
Content-Location
X-Amz-Apigw-Id
X-Amzn-RequestId
X-Cache-TTL
X-Ua-Compatible
Cloudfront-Viewer-Country
X-HW
X-Status
Allow
Liferay-Portal
X-Debug-Info
X-Powered-By-Plesk
X-Vcl-Version
Odigeo-Trace-Id
X-NODE
Cf-Railgun
X-Language
X-Country-Code
X-Trace
Resin-Trace
X-Api-Version
X-BYPASS-REASON
X-ProxyCache-Status
P3p
X-Cdn
X-B3-TraceId
X-ProxyCache-Key
X-Akam-SW-Version
X-Generated-By
X-Envoy-Decorator-Operation
X-B3-TraceId-Primal
X-Server-ID
X-Yottaa-Optimizations
Request-ID
X-Yottaa-Metrics
X-ID
Pinterest-Version
Surrogate-Control
AKAMAI-GRN
X-Request-Processing-Time
X-Request-Received
X-URL
Pinterest-Generated-By
X-VC
Mrf-Cache-Status
X-UA-Device
X-Template
X-Pinterest-Rid
MRF-Tech