Threat Level: green Handler on Duty: Didier Stevens

SANS ISC: HTTP Header Usage Statistics - Internet Security | DShield 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
Content-Type
Date
Connection
Server
Vary
Cache-Control
Link
Expires
X-Powered-By
Content-Length
Pragma
Last-Modified
Accept-Ranges
ETag
X-Content-Type-Options
X-XSS-Protection
Strict-Transport-Security
X-Cache
X-Frame-Options
Content-Language
CF-RAY
Age
X-Wix-Server-Artifact-Id
X-Accel-Buffering
X-Pingback
Via
P3P
Expect-CT
X-AspNet-Version
X-Cacheable
X-UA-Compatible
Content-Security-Policy
X-Via
X-ServedBy
X-Contextid
X-PC-Key
X-PC-Hit
X-Request-Id
X-Wix-Request-Id
X-Seen-By
X-PC-Host
X-PC-Date
X-PC-AppVer
WPE-Backend
X-Type
X-Pass-Why
X-Cache-Group
Access-Control-Allow-Origin
X-UA-Device
X-Ua-Compatible
X-Rid
X-Tumblr-Pixel-0
X-Tumblr-Pixel
X-Tumblr-User
X-Tumblr-Pixel-1
X-NewRelic-App-Data
X-Tumblr-Pixel-2
X-Permitted-Cross-Domain-Policies
X-Download-Options
X-Adblock-Key
X-Sorting-Hat-PrivacyLevel
X-Sorting-Hat-PodId-Cached
X-Sorting-Hat-Section
X-Sorting-Hat-ShopId-Cached
X-Sorting-Hat-PodId
X-Sorting-Hat-ShopId
X-Dc
X-Alternate-Cache-Key
X-Sorting-Hat-FeatureSet
X-ShardId
X-ShopId
Upgrade
X-Check
Referrer-Policy
X-Tumblr-Pixel-3
Alt-Svc
Host-Header
X-Ac
X-Template
X-Language
X-Hacker
X-Buckets
X-Cache-Hits
X-Runtime
X-Varnish
X-Generator
X-WPE-Loopback-Upstream-Addr
X-Served-By
X-TEC-API-VERSION
X-TEC-API-ROOT
X-TEC-API-ORIGIN
X-Host
P3p
X-Drupal-Cache
X-Tumblr-Pixel-4
X-Timer
X-CST
X-Backend
X-Endurance-Cache-Level
X-Cache-Hit
X-Port
X-Newrelic-App-Data
X-AspNetMvc-Version
CF-Cache-Status
Access-Control-Allow-Headers
Status
Access-Control-Allow-Methods
X-Amz-Cf-Id
X-Powered-By-Plesk
X-FRAME-OPTIONS
Access-Control-Allow-Credentials
X-Cache-Enabled
X-Request-ID
X-Iinfo
X-Cache-Status
Content-Location
X-FW-Hash
X-FW-Server
X-Webcom-Cache-Status
X-FW-Static
X-FW-Serve
X-FW-Type
Keep-Alive
X-Robots-Tag
X-Wix-Punisher
X-Server
X-Tumblr-Pixel-5
X-Pantheon-Styx-Hostname
X-Styx-Req-Id
X-CDN
X-Hits
X-GitHub-Request-Id
X-Proxy-Cache
Content-Encoding
X-Rack-Cache
Rating
Edge-Control
X-FullPageCaching
MS-Author-Via
X-Tumblr-Content-Rating
X-Trace
X-HS-Cache-Config
Edge-Cache-Tag
X-DDC-Arch-Trace
X-HS-Content-Id
X-BC-Stapler
X-Tumblr-Pixel-6
X-Pad
X-Server-Powered-By
Powered-By
X-HS-Combine-CSS
X-Amz-Request-Id
X-Amz-Id-2
X-Mod-Pagespeed
X-Nginx-Cache-Status
X-Turbo-Charged-By
X-Drupal-Dynamic-Cache
X-INKT-SITE
X-INKT-URI
Content-Security-Policy-Report-Only
X-IPLB-Instance
X-LiteSpeed-Cache
X-DIS-Request-ID
Request-Context
X-Fastly-Request-ID
P-WS
P-LB
X-XRDS-Location
X-Logged-In
X-CF-Powered-By
X-Version
X-Content-Digest
X-Accel-Version
Allow
X-Page-Speed
X-Acc-Exp
Charset
Last-Published
X-Request-Country
X-Zen-Fury
X-Svr-Proxy
Timing-Allow-Origin
X-SVR-IIS
X-SSLProxy
X-SSLUpstream
Access-Control-Max-Age
X-Cdn
Cf-Railgun
X-Cnection
X-Upstream
X-Server-Name
X-Content-Powered-By
X-AH-Environment
X-Varnish-Cache
MicrosoftOfficeWebServer
X-LW-Cache
X-Cache-Lookup
X-Amz-Version-Id
X-Varnish-TTL
X-Device
WP-Super-Cache
X-SharePointHealthScore
SPRequestGuid
MicrosoftSharePointTeamServices
EagleId
X-HeyJason
X-Do-Not-Hack
Permitted-Cross-Domain-Policies
X-Safe-Firewall
X-Varnish-Count
Access-Control-Expose-Headers
X-MS-InvokeApp
Cartoon
X-Varnish-HitMiss
X-Cloud-Trace-Context
X-Swift-SaveTime
X-Swift-CacheTime
X-Source
X-StackifyID
X-SS-Location
X-PhApp
X-Kinsta-Cache
X-VCache
X-Webserver
X-SS-Conf
X-Backend-Server
SiteSpeed
X-ET-API-ROOT
X-Middleton-Display
X-Sol
Response
Display
X-ET-API-VERSION
X-ET-API-ORIGIN
X-Middleton-Response
X-Loop
X-TNCMS
X-Whom
X-User-Agent
X-Cache-Config
Liferay-Portal
X-Litespeed-Cache
X-Powered-CMS
Strikingly-Cached-Version
X-Abgroup
X-URLSCHEME
X-Cluster-Node
Strikingly-Cache-Region
Strikingly-Cached
X-RESOURCE
X-DealerOn
X-Dealeron-Backend
X-Cache-Key
X-Dealeron-Original-Url
X-Clacks-Overhead
X-Pool
Fastcgi-Cache
Cache-Key
Access-Control-Request-Method
X-Vip
Request-Id
X-Goog-Hash
X-Handled-By
Generator
X-LiteSpeed-Cache-Control
Req-Id
X-N-OperationId
X-Micro-Cache
WP-FROM-CACHE
X-Xss-Protection
CS-SERVER
X-ServerName
X-Hostname
W
Surrogate-Control
X-S
Public-Key-Pins-Report-Only
X-SRV
X-Unbounce-Variant
X-AspNetWebPages-Version
X-Unbounce-VisitorID
X-Storage-Cache-Date
Pagespeed
X-Storage-Cache-Expires
X-LB-Server
X-Storage-Cache
X-HS-Content-Campaign-Id
X-Unbounce-PageId
X-Cached
PageSpeed
FindLaw
X-OneAgent-JS-Injection
X-Ruxit-JS-Agent
X-Cache-Info
X-Server-Instance
X-TTFB-L
X-Wikidot-Backend
X-Path-Route
X-SmugMug-Values
Public-Key-Pins
X-TTFB
X-Generated
X-Wikidot-Static-Cache
X-Locale
X-Env
X-SP-UniqueName
SPIisLatency
SPRequestDuration
X-SmugMug-Hiring
X-SP-Farm
X-ARC
Grace
SN
X-Content-Security-Policy
Smug-CDN
X-Node
X-Device-Type
X-Hosted-By
X-SRCache-Store-Status
X-SRCache-Fetch-Status
X-Translation
X-Request-Time
X-Hrouter
X-Hstore
X-Microcache-Status
X-FORWARDED-FOR
X-Varnish-Debug-TTL
X-Varnish-Debug-Age
Cache-Provider
X-Span
X-Key
X-Microcachable
Retry-After
X-Cached-By
X-APIVERSION
X-Dns-Prefetch-Control
X-Origin-Id
X-ENDPOINT
X-FIRSTBase
X-ORIKEY
X-Forwarded-For
X-Hyper-Cache
X-Lambda-Id
X-ROUTING
X-Topify-Platform
X-Instart-Request-ID
X-APIAUTH-VAL
Content-Style-Type
Powered-By-ChinaCache
X-Cache-Miss-From
X-Response-Time
X-Supported-By
X-Sedo-Request-Id
Content-Script-Type
X-Ezoic-Cdn
X-Appmachine-Environment
ServerID
X-Via-S
X-XN-Trace-Token
X-XN-XNHTML
IM-Version
Content-Encoding-Handler
X-Varnish-Debug-Hits
ServerNode
USPLoggingUUID
SSPAppContext
X-Jimdo-Instance
X-Jimdo-Wid
X-RateLimit-Limit
X-RateLimit-Remaining
ViewMode
VSID
*
X-Application-Context
X-RateLimit-Reset
Use-Proxy
X-Middleware-Start
X-Trace-Id
X-ApacheServer
Node
Request-EU
Request-Country
ServedBy
Firespring-Website-Id
X-SSL-Protocol
X-SSL-Cipher
X-Server-Upstream
Rt-Fastcgi-Cache
X-Engine
X-4ormat-Cacheable
X-Vcache
X-Microcache
MC
X-Accel-Expires
Aurora-Node
Version
X-PERF
X-FromPodPressCache
X-Magento-Cache-Debug
X-Magento-Cache-Control
X-HS-Status
X-Origin
X-Passed-To-DLL
X-App-Status
X-Passed-To
X-Original-Request
X-Firefox-Spdy
X-Dscp-Value
X-FB-Debug
X-CPU-Time
X-Cache-Handler
X-Expires-Orig
X-UD-Method
X-NWS-LOG-UUID
X-Edge-IP
X-Edge-Location
X-Fastcgi-Cache
X-Daa-Tunnel
X-Sucuri-ID
TCN
X-Fedora-School-Id
X-Cache-Control-Orig
Accept-Encoding
X-Varnish-Beresp-Status
X-Varnish-Beresp-Grace
X-Varnish-Server
X-Generated-Timestamp
X-VARITI-CCR
X-Ratelimit-Remaining
X-Ratelimit-Limit
X-Varnish-Beresp-Ttl
X-Ratelimit-Reset
X-Returned-From
X-Sucuri-Cache
X-Stale
X-Returned-From-DLL
X-DNS-Prefetch-Control
X-Speed-Cache-Key
X-HeBS-Cache-Status
RequestId
X-GUploader-UploadID
X-Goog-Stored-Content-Length
X-Goog-Stored-Content-Encoding
Imagetoolbar
X-Matrix-Proxy
X-Original-Date
X-Mighty-Proxy
Feature-Policy
X-Matrix-Server
X-Goog-Storage-Class
X-Goog-Metageneration
Surrogate-Key-Raw
X-Dw-Request-Base-Id
X-Discourse-Route
X-Debug-Info
X-Consent-Required
X-Empowered-By
Surrogate-Key
X-Goog-Generation
Service-Worker-Allowed
Ssl-Proxy-Server
X-Environment
X-Pantheon-Environment
X-Pantheon-Phpreq
X-Speed-Cache
X-Amz-Meta-S3cmd-Attrs
X-Proxy-Backend
X-Processing-Time
X-NoCache
X-URL
X-VC-Enabled
REFRESH
PBS
Fpc-Cache-Id
X-WEBMGR-CACHE
X-GeoIP-Country-Name
X-GeoIP-Country-Code
Xkey
Composed-By
X-Umbraco-Version
X-Rocket-Nginx-Bypass
X-Pantheon-Site
Hummingbird-Cache
IES-Server
X-Cookie-Domain
Origin
MIME-Version
Load-Balancer
X-Actual-URL