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