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