Threat Level: green Handler on Duty: Brad Duncan

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