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