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