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