Threat Level: green Handler on Duty: Daniel Wesemann

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