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