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
Content-Type
Date
Connection
Server
Cache-Control
Vary
Expires
X-Frame-Options
Strict-Transport-Security
Content-Length
X-Content-Type-Options
Link
Last-Modified
Cf-Request-Id
CF-Cache-Status
ETag
Expect-CT
Accept-Ranges
X-Powered-By
Pragma
X-XSS-Protection
CF-RAY
X-Cache
Via
Age
Content-Security-Policy
Report-To
NEL
Referrer-Policy
Access-Control-Allow-Origin
Content-Language
X-Amz-Cf-Pop
X-Amz-Cf-Id
Alt-Svc
P3P
X-Cache-Hits
X-UA-Compatible
X-Xss-Protection
X-Served-By
CF-Ray
X-Download-Options
X-Request-Id
X-Timer
Access-Control-Allow-Headers
Access-Control-Allow-Methods
X-Varnish
X-Adblock-Key
Access-Control-Allow-Credentials
X-Permitted-Cross-Domain-Policies
Content-Security-Policy-Report-Only
X-AspNet-Version
X-Runtime
X-Drupal-Cache
X-Cache-Status
X-Generator
X-Check
X-Cacheable
X-DNS-Prefetch-Control
X-Envoy-Upstream-Service-Time
X-FRAME-OPTIONS
Timing-Allow-Origin
X-Iinfo
X-Drupal-Dynamic-Cache
X-Dns-Prefetch-Control
Feature-Policy
X-Content-Security-Policy
Server-Timing
Access-Control-Expose-Headers
Content-Encoding
X-XSS-PROTECTION
Status
X-CDN
Upgrade
X-Request-ID
X-AspNetMvc-Version
Access-Control-Max-Age
X-Amz-Request-Id
X-Amz-Id-2
Request-Context
X-Via
X-Turbo-Charged-By
X-Backend
X-Cache-Group
X-AH-Environment
X-Robots-Tag
Cf-Edge-Cache
Keep-Alive
Host-Header
X-Hacker
X-UA-Device
X-Proxy-Cache
X-Vhost
X-Server
X-Rq
X-Server-Powered-By
Allow
X-Ws-Request-Id
X-Age
X-Varnish-Cache
X-Dispatcher
EagleId
X-Amz-Version-Id
X-LiteSpeed-Cache
P3p
Nel
Grace
Cf-Apo-Via
Cf-Railgun
X-Page-Speed
X-Pantheon-Styx-Hostname
X-Styx-Req-Id
X-Device
EagleEye-TraceId
X-Aws-Lambda-Call-Status
X-Swift-SaveTime
X-Swift-CacheTime
Ali-Swift-Global-Savetime
X-Pingback
X-OneAgent-JS-Injection
X-Host
X-Node
Accept-CH
X-CST
X-WebKit-CSP
X-Cache-Lookup
X-Backend-Server
X-Server-Id
Surrogate-Control
X-Readtime
X-Nginx-Cache-Status
Permissions-Policy
X-Nginx-Upstream-Cache-Status
X-EdgeConnect-Origin-MEX-Latency
X-EdgeConnect-MidMile-RTT
X-Akam-SW-Version
Request-Id
X-Application-Context
Accept-CH-Lifetime
X-Content-Security-Policy-Report-Only
X-Cloud-Trace-Context
X-Response-Time
X-Ua-Compatible
X-HW
X-Trace
Xkey
X-Edge
Content-Location
X-Clacks-Overhead
X-Ruxit-JS-Agent
X-Mod-Pagespeed
Rating
X-Url
X-ESI
X-Midtier
X-Amz-Server-Side-Encryption
X-ECACHE
X-Oneagent-Js-Injection
X-Mcache
Accept-Ch-Lifetime
X-Country
Cache-Tag
X-Upstream
X-MS-InvokeApp
X-Vcap-Request-Id
X-Rack-Cache
X-D2id
X-Powered-By-Plesk
Verso
X-Use-Magma
X-Kinja-Server
X-Exp-Variant
X-Cdn-Fetch
X-Exp-Id
X-Kinja-Build
X-Kinja
X-GoogleNews-Bot
X-Kinja-Revision
X-Element-Page-Cache
Accept-Ch
Edge-Control
X-Vname
X-PC
X-TtlSet
RTSS
X-Ruxit-Js-Agent
Service-Worker-Allowed
X-Ac
X-Webkit-CSP
X-Country-Code
Origin-Trial
X-VARITI-CCR
Fastly-Restarts
X-Navigation-Version
X-Goog-Hash
X-Abt-Application-Version
X-Cache-TTL
X-WebKit-CSP-Report-Only
X-GitHub-Request-Id
X-Cached
X-Browser-Type
X-Amz-Rid
X-Varnish-TTL
X-Litespeed-Cache
X-Aspnetmvc-Version
X-Middleton-Display
X-Sol
Display
Pagespeed
Cross-Origin-Opener-Policy
X-Kinja-CCPA
X-Dw-Request-Base-Id
X-Server-Name
X-SharePointHealthScore
SPRequestGuid
X-Amzn-Trace-Id
X-Ttl
X-NWS-LOG-UUID
X-Content-Type
X-ORACLE-DMS-ECID
X-ORACLE-DMS-RID
X-Powered-CMS
SPIisLatency
SPRequestDuration
X-Mg-S
AR-Request-ID
AR-ATIME
AR-PoweredBy
AR-SID
X-Kraken-Loop-Name
X-Erf-Bev-Bev-Is-Generated
X-Server-Lifecycle-Phase
X-Erf-Bev-Bev
X-Instrumentation
X-Cache-Key
Arr-Disable-Session-Affinity
X-Pinterest-Rid
Pinterest-Generated-By
Pinterest-Version
X-Middleton-Response
Response
X-Client-IP
X-Times
X-Fastly-Request-ID
X-Version
X-B3-TraceId
X-HP-Webp
X-B3-Traceid
X-Jurisdiction
X-Cnection
X-HP-Trace-Id
AR-CACHE
X-FastCGI-Cache
X-Accel-Expires
X-SRCache-Fetch-Status
X-T
X-SRCache-Store-Status
Cache-Tags
Nginx-Cache
X-Ser
Cache-Status
Edge-Cache-Tag
Front-End-Https
X-MSEdge-Ref
X-RateLimit-Remaining
X-Hits
X-Px
X-NF-Request-ID
Public-Key-Pins
X-Recruiting
Payment
X-LLID
X-Frontend
Mrf-Cache-Status
X-Request-Received
MRF-Tech
X-B3-TraceId-Primal
X-Request-Processing-Time
Server-Node
X-RateLimit-Limit
X-Ua-Browser
S
X-Shield-Request-Id
X-Server-ID
Content-MD5
X-DIS-Request-ID
X-GUploader-UploadID
X-Goog-Metageneration
MicrosoftSharePointTeamServices
X-PressLabs-Stats
Access-Control-Request-Method
TP-Cache
X-Amzn-RequestId
X-Amz-Apigw-Id
X-Content-Digest
X-Daa-Tunnel
X-Protected-By
X-HS-Cache-Config
X-HS-Hub-Id
X-Fastcgi-Cache
X-HS-Combine-CSS
X-HS-Content-Id
Realpath
X-Request-Handler-Origin-Region
X-Distributor
Fastcgi-Cache
X-Microsite
X-FB-Debug
Access-Control-Allow-Method
X-TTL
X-LB-Cache
X-Forwarded-For
X-Page-Id
X-Rid
X-Cluster-Name
Accept-Charset
X-Erf-Stays-Pdp-Viaduct-Migration-Web
TP-L2-Cache
X-Geo-Country
X-Hostname
X-Ratelimit-Remaining
X-B3-Sampled
X-Webkit-CSP-Report-Only
X-Ezoic-Cdn
X-Goog-Generation
X-Goog-Storage-Class
X-Goog-Stored-Content-Length
X-Goog-Stored-Content-Encoding
X-Aspnet-Version
X-Seen-By
X-Ua-Device
Cross-Origin-Resource-Policy
Count-Hit
X-Newrelic-App-Data
Cleartype
TCN
Referer-Policy
X-Mobile
X-App-Server
DC
X-Varnish-Backend
X-Ratelimit-Limit
X-Kinsta-Cache
X-Logged-In
X-Correlation-Id
X-Content-Options
X-Edge-Location-Klb
X-Origin-Cache
X-Git-Hash
X-Hosted-By
X-Debug-Info
X-Contextid
X-Is-Crawler
X-Providence-Cookie
X-Request-Guid
X-Aspnet-Duration-Ms
X-Amz-Replication-Status
X-Fb-Rlafr
X-Flags
X-Route-Name
X-Envoy-Decorator-Operation
X-Revision
X-IPS-LoggedIn
X-Grace
Surrogate-Key
X-App-Environment
X-TT
X-Varnish-Grace
Frame-Options
X-Amz-Meta-S3cmd-Attrs
X-Id
X-Forwarded-Proto
Retry-After
X-Azure-Ref
X-F-Cache
X-TEC-API-ORIGIN
X-TEC-API-ROOT
X-TEC-API-VERSION
X-RateLimit-Reset
Section-Io-Cache
X-Wix-Request-Id
X-Origin-Server
X-Whom
X-Magnolia-Registration
Healthy
Alternate-Protocol
Charset
X-Xrds-Location
MS-Author-Via
X-Akamai-Edgescape
X-Proxy-Cache-Info
Viewport
X-App-Version
X-Nf-Request-Id
X-Backend-Name
X-COUNTRY
X-Www-Served-By
WPO-Cache-Status
WPO-Cache-Message
X-Activity-Id
Paypal-Debug-Id
X-AppVersion
X-Az
X-B
X-Language
X-Webkit-Csp
SRV
Filterid
X-Varnish-Server
Host
X-Cache-Rule
SD-X-WS
VIX-Pulpo-Upstream-Status
VIX-Pulpo-Node
X-Response-Served-From
X-Original-Request-Id
X-Http-Reason
X-Datadog-Parent-Id
X-Datadog-Sampling-Priority
Akamai-GRN
X-Rule
X-Datadog-Trace-Id
Front
X-User-Agent
X-UUID
Country
Server-Name
X-Edge-Location
X-Instance
X-Akamai-Request-ID2
X-Cache-Grace
ServerID
Amp-Access-Control-Allow-Source-Origin
From-Origin
X-EdgeConnect-Cache-Status
X-Page-View
X-Unique-Id
X-Region
X-Jobs
X-Status
X-Environment-Context
X-Varnish-Age
X-N
X-L-Path
X-Cacheable-TTL
X-ARC
Protected
X-Time
X-FW-Static
X-FW-Version
X-FW-Type
X-Tumblr-Pixel
X-Framework
X-FW-Dynamic
X-Rocket-Nginx-Serving-Static
X-Is-Bot
X-Rendered-As
X-Adobe-Content
X-FW-Hash
X-FW-Serve
Fastly-SIE
X-Tumblr-Pixel-1
X-Tumblr-Pixel-0
X-Adobe-Loc
X-FW-Server
X-Tumblr-User
Fastly-SWR
X-Load-Cache
X-Trace-Id
X-Type
X-Tec-Api-Root
X-Cache-Time
X-Tec-Api-Version
X-RemovedCookies
X-G
X-ProcessESI
X-Kong-Upstream-Latency
X-Tec-Api-Origin
X-Kong-Proxy-Latency
X-DataDome
Access-Control-Request-Headers
X-Client-Ip
X-Proxy
X-Yottaa-Metrics
X-Yottaa-Optimizations
Content-Disposition
X-Mg-Request-UUID
X-Datadog-Sampled
X-Cache-Control
X-Debug-IsConnected
X-B-Cache
X-Signature
X-Vcache
X-Amzn-Remapped-Content-Length
X-Debug-IsPreview
X-Cache-Age
X-CDN-Forward
X-XRDS-Location
X-ECache
Refresh
Backend
X-Drupal-Cache-Tags
Countrycode
X-WP-CF-Super-Cache-Cache-Control
Xet-Cookie
Accept-Language
X-DynaTrace
X-WP-CF-Super-Cache
X-Erf-Web-Scheduler
X-Nginx-Cache
X-Source
CF-IPCountry
X-Generated-By
X-Servername
X-Httpd
X-DynaTrace-JS-Agent
X-HTML-Minification-Powered-By
X-Tt-Trace-Host
X-Tt-Trace-Tag
Webserver
Url
X-XRDS-LOCATION
X-Mode
Version
X-Device-Type
Xserver
X-NYM-Debug-Backend
X-Template
X-Content-Powered-By
X-Storage
GEO-INFO
X-Content-Age
X-GeoCode
X-JoinUs
X-LAGOON
X-GeoCountry
X-Cache-Operation
OT-Force-Account-Verify
X-Director
X-SaId
Filters
Load-Balancing
Locale
X-Rn-Rsrv
X-Rewrite-Enabled
X-Urbn-Context-Path
X-Urbn-Site-Id
X-Say-Cacheable
X-Say-TTL
Meta-Geo
Onion-Location
X-Cache-Action
X-UPSTREAM-Address
X-ServerID
X-SayCDN-TTL
S-Rt
X-Git-Commit
X-Varnish-Cache-Hits
X-Cluster-Node
X-Tt-Logid
X-Container-Uri
X-Soup
X-Generation-Time
X-Varnish-Hostname
X-Forwarded-Host
Web-Mar-Node
Azure-SiteName
Azure-SlotName
Azure-Version
Azure-RegionName
Azure-InstanceId
X-Cache-Server
X-Adobe-Source
X-Detected-As
X-Tb
X-Lambda-Id
X-VC-Cache
X-VCT
X-Sql-Duration-Ms
X-RM-Cache-TTL
X-Ms-Request-Id
X-Proto
X-PHP-Host
X-Ms-Version
X-Sql-Count
X-Served-From
X-Labrador-Cache-Channel
X-R9-Blue-Green-Version
X-CCDN-CacheTTL
X-CCDN-Origin-Time
X-Routing-Service
X-FB-TRIP-ID
X-Logging-Id
DB-Nickname
X-RCS-CacheZone
X-Extlb
X-Hcs-Proxy-Type
X-Format
X-Tncms
X-Loop
Node
X-Tumblr-Pixel-2
X-Proxied
X-URL
X-Tumblr-Pixel-3
Mn-Server-Ip
X-Skip-Cache
X-Zipkin-Id
Selected-Fe
TWC-Connection-Speed
X-Proxy-Build
Property-Id
X-Fetched-On
X-Origin-Hint
TWC-Locale-Group
Webcakes-App-Name
Webcakes-App-Version
Webcakes-Region
X-Timing-Wait
Uber-Trace-Id
X-Debug
TWC-GeoIP-Country
X-Uri
TWC-GeoIP-LatLong
TWC-Device-Class
TWC-Privacy
Fastcgi-Useragent
X-TimeS
X-MCACHE
X-Cache-Hit
Cross-Origin-Window-Policy
X-Zen-Fury
X-LSADC-Cache
X-Ua
X-Endurance-Cache-Level
X-Srv
Source
X-Sucuri-ID
X-Sucuri-Cache
X-Redis-Cache
X-B3-SpanId
X-Upgrade-Enabled
X-Drupal-Cache-Contexts
CDN-RequestId
Section-Io-Origin-Status
X-Oracle-Dms-Ecid
Section-Origin-Responded
Section-Io-Origin-Time-Seconds
Section-Io-Id
X-Oracle-Dms-Rid
X-MP-GENERATED-AT
X-Newrelic-Synthetics
X-Varnish-Ttl
X-NGENIX-Cache
X-Origin-Date
X-Varnish-Hits
Fastly-Drupal-HTML
X-S
Liferay-Portal
X-Ratelimit-Reset
X-Cache-Expired-At
X-Pass-Why
Upgrade-Insecure-Requests
X-Origin-TTL
X-Origin-CC
X-Real-IP
X-Akamai-Transformed
X-ID
NGB
X-Handled-By
X-Cache-TTL-Remaining
X-CACHE-AGE
X-FTR-Request-ID
X-UA-Device-Type
X-Via-JSL
X-Node-Name
Apigw-Requestid
X-Hl-Ver
X-Cache-Type
X-Pubstack
X-Cms-Context
X-Correlation-ID
X-Xfnlog-Site
X-Reqid
X-Optimistic-Header
CDN-RequestPullSuccess
X-RTag
Ms-Operation-Id
CDN-Uid
CDN-EdgeStorageId
X-CSRF-Token
CDN-Cache
CDN-RequestPullCode
MS-CV
ServedBy
X-Restarts
CDN-PullZone
X-GEO
CDN-CachedAt
CDN-RequestCountryCode
X-No-Session
X-BYPASS-REASON
X-Cache-Host
X-ProxyCache-Key
X-Server-W
X-ProxyCache-Status
WP-Super-Cache
X-Parent-Response-Time
Content-Secure-Policy
Surrogated-Key
Sslversion
Rendered-Blocks
Server-Host
Redirect-Candidate
L
Canary
Candidate-Md5Url
DCR-Decision-By
DCR-Processing-Time-Ms
BehaviorPad-Version
X-VWS-Id
X-Cluster
X-IPLB-Instance
X-IPLB-Request-ID
X-LJ-Flow-ID
Fastly-SSL
Gannett-Cam-Experience-Id
Meta-Geo-Continent
N-Cache
Ngx.Var.Host
Odigeo-Trace-Id
MD5-Digest
Magicmarker
Ha-Gx-Prefs
HA-Ipaddr
L5d-Success-Class
Lang
Origin-Agent-Cluster
X-BCube-Filmed-By
X-Nyt-Route
X-Gdpr
X-Orig-Expires
X-Origin-Time
X-Rojux
X-Request-Host
X-Forwarded-Path
X-FC-Vary-Parameters
X-Epic-Correlation-Id
X-Ec-GeoHdr
X-Eu-Site
X-External-Request-Id
X-Fastly-Backend
X-S-Cookie
X-ScT
X-Viewer-Country
X-Vdms-Version
X-Vtex-Remote-Cache
X-We-Are-Hiring
Xc-Version
X-Worker
X-Vdms-Path
X-Tenant
X-Shop-Environment
X-SD-PageType
X-Slack-Backend
X-Slack-Shared-Secret-Outcome
X-SRCache-Key
X-Ec-Fail
X-Ec-Custom-Error
X-A-Dgt
X-A-Dcw
X-A-Wwc
X-Aed
X-Application
X-App
X-A-Dam
X-A-Ccd
Vix-Hermes-Req-Id
True-Client-Country-4JS
W
Web-Mar-Region
X-A
X-Bc-Bl
X-Bl-Debug
X-Debug-Cache-Fetch
X-D
X-Debug-Cache-Store
X-Destination
X-Dispatcher-Number
X-Developer
X-Csrf-Jwt
X-Conf
X-CacheTTL
X-Cache-NE
X-CF-Lambda-Fn
X-CF-Lambda-Version
X-CGP
T-Server
X-B-Cookie
X-AWS-Id
X-Datadome
X-Tx-Id
Release
Req-Svc-Chain
Producers
Platform
X-Node-Id
X-Nitro-Cache
X-Nananana
X-Level-Front-Cache
TDXMobile
X-Loc
X-Mid
X-Mvc-Supplant-Cachable
X-Mly-Id
X-Date
Origin
Is-Eu
X-Qloud-Router
X-RateLimit-Limit-Second
Host-ID
X-Refresh
X-RateLimit-Remaining-Second
X-Pool
X-Policy
X-Org
Thinkindot-CacheControl
X-Owner
X-PAYTM-SRV-ID
X-Platform
Mail-Subject
X-Old-Content-Length
Thinkindot-Control
X-DPWN-IS-SECURE
X-Cdn-Diag
X-Cache-Info
X-Cache-Debug
X-Bip
X-Cache-Bucket
X-Cdn-Origin
X-DefHash
X-Core-Mission
X-Core-Value
X-CMSURLCustom
X-Clientip
X-DefElseHash
X-BBC-Edge-Cache-Status
X-Generated-On
We-Hiring
X-Human
VNS-Cache
VNS-Age
Gh-Request-Id
X-Irp-Debug
X-Hash
X-GeoIP-Region-Code
X-Alternate-Cache-Key
X-Geo-Header
X-GeoIP-Country-Code
X-Accel-Expires-Debug
X-Accel-Buffering
Thinkindot-CacheControl-Type
X-NodeID
X-SVT-ORM-VERSION
X-SVT-ORM-RULES
X-VServer
X-Request-Time
Adler-Geo
AKAMAI
X-Storefront-Renderer-Rendered
Cache-Provider
X-Shopify-Stage
Cf-Device-Type
X-Wikidot-Backend
X-Sn-Servicetimems
X-Sorting-Hat-PodId
X-Test
X-Proxy-Cache-Status
X-Varnish-CookieHashed-On
X-VG-TLSProxy
X-Varnish-CookieINHashed-On
X-Varnish-Remaining-TTL
X-Varnishpool
X-VG-WebCache
X-Variation
X-Thanos
X-Vmg-Version
X-Thinkindot-L3
X-Up
X-Var-Ttl
X-Wikidot-Static-Cache
X-Sorting-Hat-ShopId
Datacenter
Fastly-Backend-Name
Fastly-GeoIP-CountryCode
CPC-Cache
Expect-Staple
Environment
X-ShardId
X-ShopId
X-Server-IP
CPC-Age
X-Wix-Viewer-Type
X-S-Maxage
Cmstype
Cmsid
X-App-Name
AMP-Access-Control-Allow-Source-Origin
X-Cache-Status-Check
User-Cache-Control
Cache-Name
X-Vcl-Version
X-TIME
X-PERF
Machine
X-Cache-Id
X-Gzip
X-Block-Status
X-GeoIP
X-Forwarded-Site
X-Micro-Cache
X-Auto-Login
X-Gen-Mode
X-Hnp-Log
X-Fmm-Version
X-From
X-Akamai-Device-Characteristics
Esi-Enabled
X-ApacheServer
X-Esi-Check
X-INCAP-ABP
Sever-Int
X-WADP-Cache
X-Mvc-Supplant-OutputCached
X-AB
X-Cdn-Srv
Server-Hostname
Server-Ext
X-Nginx-Cache-Key
X-Clara-WADP
CDCHOST
Country-Code
X-AIR-PT
X-WA-Info
Apple-News-Services-Handled
X-Origin-Response-Time
CloudFront-Viewer-Country
X-Dispatcher-Server
Apple-News-Services-Host
X-Device-Os
Apple-News-Services-Request-Url
NM-Fastcgi-Cache
Apple-News-Services-Parsed-Url
X-Origin
DSUID
X-Cache-Enabled
X-Instance-Name
Server-Info
Ssr
X-Fastly-Request-Id
X-NCache
Pics-Label
X-Section
NGX
X-Op-Id-All
X-LB-NoCache
C-Via
Wxu-Next-Region
X-Access
X-Amz-Meta-Cb-Modifiedtime
Wxu-Next-Hostname
Wxu-Next-Commit
X-B3-Spanid
X-Geo-Region
X-Dc
X-API-Version
X-JWT-State
X-Via-Fastly
X-Has-Esi
X-Is-Gdpr
Memcached
Server-ID
X-TraceId
Hostname
X-HA-Backend
X-ZONE
X-Accel-Version
X-CACHE-GROUP
X-Vgn-Hpd-Reason
X-Varnish-Beresp-Grace
Cache-Hits
X-Varnish-Beresp-Ttl
Memory
Time
Cdn-Requestid
Origin-CC
Origin-EX
X-Scale
X-PHP-Backend
X-Wp-Cf-Super-Cache-Active
X-Buckets
X-Is-Mobile
X-Is-Supported-Browser
X-Is-Tablet
X-Tcp-Rtt
X-TIM-N
X-Is-Desktop
X-Browser-Name
Sid
IsBot
X-Platform-Cluster
X-Platform-Processor
X-Platform-Router
X-SIPLIST1
X-Air-Hostname
X-Air-Trace-Id
X-Air-Source
Location
X-Presslabs-Stats
X-Tb-Optimization-Total-Bytes-Saved
YJS-ID
CF-Ctrl
X-Internal-Host
X-Fpc
Resin-Trace
X-Cs
X-Cached-By
X-Azure-Ref-OriginShield
X-Backend-Instance
X-B3-Parentspanid
X-WP-CF-Super-Cache-Active
X-Zone
GeoIP-Latitude
X-DC
X-Microcachable
X-Origin-Expires
Cache-Host
Epwk-X-Cache
X-Hyper-Cache
X-TA-CDN-Provider
X-Frame-Option
X-VCache
X-Info
Uri
X-DataCenter
True-Client-Ip
XM
X-Site-Version
X-Web-Node
X-LiteSpeed-Cache-Control
X-Origin-Cache-Key
X-Service
X-Webstats-RespID
X-VarnishDD-TTL
GeoIP-Country-Code
X-Nitro-Rev
X-Pod-Name
X-Nitro-Cache-From
X-VC
PFcat
X-HN
X-NGINX-Cache
X-Locale
Cdn
X-Ad-Defer-Variation
User-Agent
GeoIp-Country-Code
X-FTR-Cache-Status
X-FTR-Expires
X-FTR-Backend-Server
X-FTR-Backend
X-Country-Code-Real
X-FTR-Balancer
X-Cache-Ttl
Edge-Copy-Time
X-CS
X-Via-CDN
X-Datacenter
X-Via-Edge
X-Via-SSL
XServer
X-FL-QIT-DEBUG
X-FL-EDGE
Locid
Srvid
X-Geo
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X-CSRF-TOKEN
LB
X-NewRelic-App-Data
True-Client-IP
Cdn-Host
X-Edge-Server
Cdn-Request-Time
NtCoent-Length
X-Vercel-Id
X-Vercel-Cache
X-ATG-Version
Req-ID
X-NMSegId
X-Moov-T
X-Moov-Xdn-Version
X-Contensis-Viewer-Groups
X-TRACE-ID
X-Cache-ASPX
X-Webkit-Csp-Report-Only
X-Varnish-Authentication
M-TraceId
X-FireWall-Port
X-Pad
X-MSEdge-Flight
Fastly-Drupal-Html
X-MSEdge-Features
SID
Cache-Key
WZWS-RAY
X-FPC
X-Ad-Load-Variation
X-HostName
Tcn
WebServer
X-M-Log
X-M-Reqid
Content-Style-Type
Pramga
X-SRV
Cluster
Content-Script-Type
X-Request-Start
X-LiteSpeed-Tag
Path
X-Scope-Id
Cf-Ipcountry
X-Api-Version
CountryCode
X-Cdn-Request-ID
X-APP-VERSION
Cdnsip
X-Shield-Cache-Expires
X-Varnish-Beresp-Status
X-AK-Request-ID
X-Qnm-Cache
X-Amz-Meta-Opti
Cdncip
X-NWS-UUID-VERIFY
X-Air-Pt
X-Esi
X-Request-URI
X-Wp-Cf-Super-Cache
X-Branch-Name
X-Upstream-Ct
X-Github-Request-Id
X-Upstream-Ht
Edge-Cache
X-Wp-Cf-Super-Cache-Cache-Control
X-HS-Content-Campaign-Id
X-Planisys-CDN-Rules
X-Cache-Date
X-Planisys-CDN-Cache
X-Platform-Server
X-Planisys-CDN-TTL
State
HostName
X-Wp-Cf-Super-Cache-Cookies-Bypass
Lb
Ohc-File-Size
X-Release
XkeyRZ
X-TH-Server
X-Proxy-CacheRZ
Yak-Timeinfo
X-WP-CF-Super-Cache-Cookies-Bypass
X-Vgn-Hpd-Ssi
X-Fastly-Cache
X-Vgn-Hpd-Variations-Key
X-Vgn-Hpd-Cached
X-Rebelmouse-Cache-Control
CDN
X-CACHE-KEY
Cache-Tv-Group
X-Rebelmouse-Surrogate-Control
X-Acquia-Purge-Cdn-Unconfigured
Geoip-Latitude
X-Cache-Remote
X-Sigma
X-Render-Time
X-Via-Popn
X-Cdn-Forward
Wpo-Cache-Message
X-Sigma-Backend
Srv
Tube-Got-Results
Tube-Return
X-Tim-N
X-B3-Trace-ID
X-Rocket-Build-Number
X-Cache-FS-Status
X-HS-Status
X-Aicache-OS
X-Akamai-Pragma-Client-IP
X-SB
X-Servedbyhost
X-Req
X-Wa
Tube-Got-Eval
X-V-Cache
Proxy-Connection
X-Via-Poph
X-Via-Popv
X-Traceid
X-Generated-In
X-Nc
Tube-Get-Contents
Click-Count-Action-Start
X-LB-ID
Wpo-Cache-Status
Click-Count-Error
X-Lb-Cache
X-Vary
X-User
X-Men
X-VCL-Version
V-Age
On-Server
CF-Cached-On
X-Ha-Backend
Ohc-Cache-HIT
X-Dw-Trace-Id
Cache
X-Fastly-Backend-Reqs
X-UA
Server-Id
X-TT-LOGID
X-CUA
X-Acquia-Application-Trace
X-Via-Ucdn
Ngx-Var-Key
X-GeoIP-City
X-Gamma-Serve
MIME-Version
X-Acquia-Application-UUID
X-Acquia-Purge-Tags
X-Lb-Nocache
X-Scheme
PICS-Label
X-GoCache-CacheStatus
X-Acquia-Site
X-EC-Lua
X-Provided-By
X-Iplb-Request-Id
X-Iplb-Instance
Yjs-Id
X-TX-ID
CACHE-MISS-TO-ORIGIN
X-Cdn-Cache-Status
Inserted-Into-Cache-At
X-Vc
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X-Fastly-Cache-Hits
My-App
Mime-Version
X-Snapshot-Date
X-Miniprofiler-Ids
X-RAMCache
Cneonction
X-CF-Cache-Header-Cache-Control
X-CF-Cache-Header-Vary
Log-Origin
Ngx
Vha6-Origin
X-Cached-Since
X-ElasticPress-Query
X-Litespeed-Cache-Control
X-Udemy-Cache-App-Namespace