Threat Level: green Handler on Duty: Xavier Mertens

SANS ISC: HTTP Header Usage Statistics - Internet Security | DShield 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
Date
Content-Type
Server
Set-Cookie
Connection
Cache-Control
Vary
X-Powered-By
Expires
Content-Length
Last-Modified
Pragma
Link
Accept-Ranges
ETag
X-Content-Type-Options
X-Frame-Options
X-XSS-Protection
Strict-Transport-Security
X-Cache
CF-RAY
P3P
X-AspNet-Version
Age
X-Pingback
Content-Language
Via
X-UA-Compatible
Expect-CT
Access-Control-Allow-Origin
Upgrade
X-Adblock-Key
X-Xss-Protection
Content-Security-Policy
X-Cacheable
X-Varnish
X-Check
X-Template
X-Language
X-Generator
X-Buckets
Alt-Svc
X-Request-Id
X-Drupal-Cache
X-Type
WPE-Backend
X-Cache-Group
X-Pass-Why
X-AspNetMvc-Version
X-Hacker
X-Ac
X-Cache-Hits
X-Powered-By-Plesk
X-Permitted-Cross-Domain-Policies
Content-Location
X-Download-Options
Host-Header
X-Runtime
MS-Author-Via
X-FRAME-OPTIONS
X-ShopId
X-Sorting-Hat-ShopId-Cached
X-ShardId
X-Dc
X-Sorting-Hat-ShopId
X-Sorting-Hat-PodId
X-Sorting-Hat-PodId-Cached
X-Sorting-Hat-Section
X-Alternate-Cache-Key
Cartoon
X-Powered-CMS
X-IPLB-Instance
X-UA-Device
X-Served-By
Access-Control-Allow-Headers
Status
Access-Control-Allow-Credentials
P3p
X-Amz-Cf-Id
Access-Control-Allow-Methods
X-Cache-Status
X-Via
X-Iinfo
X-Timer
X-TEC-API-VERSION
X-TEC-API-ORIGIN
X-TEC-API-ROOT
CF-Cache-Status
Referrer-Policy
X-Backend
X-Contextid
X-DIS-Request-ID
Powered-By
X-PC-Key
X-PC-Hit
X-Mod-Pagespeed
X-ServedBy
Content-Encoding
X-PC-Date
X-PC-Host
X-PC-AppVer
X-CST
X-WPE-Loopback-Upstream-Addr
X-Logged-In
Keep-Alive
X-Host
X-Server
X-Cache-Hit
X-Rid
X-Port
X-CDN
X-Tumblr-User
X-Tumblr-Pixel-0
X-Tumblr-Pixel
X-Cache-Enabled
X-Server-Powered-By
X-Tumblr-Pixel-1
X-Request-ID
X-Endurance-Cache-Level
X-Robots-Tag
X-Nginx-Cache-Status
X-Seen-By
X-Wix-Request-Id
X-Wix-Server-Artifact-Id
X-Accel-Version
X-Tumblr-Pixel-2
X-Turbo-Charged-By
X-Page-Speed
X-Original-Date
X-Drupal-Dynamic-Cache
X-Pad
X-Content-Powered-By
Content-Security-Policy-Report-Only
X-Content-Digest
WP-Super-Cache
X-Proxy-Cache
X-AH-Environment
X-Styx-Req-Id
X-Pantheon-Styx-Hostname
X-Rack-Cache
X-Varnish-Cache
X-Tumblr-Pixel-3
X-LiteSpeed-Cache
X-GitHub-Request-Id
SPRequestGuid
X-Request-Country
Edge-Control
X-SharePointHealthScore
X-XRDS-Location
X-MS-InvokeApp
X-Cnection
MicrosoftSharePointTeamServices
X-Cache-Lookup
Timing-Allow-Origin
X-Died
X-Amz-Id-2
X-Amz-Request-Id
X-Node
Cf-Railgun
X-Trace
X-FW-Hash
X-Webserver
Charset
Request-Id
X-FW-Type
Edge-Cache-Tag
X-FW-Serve
X-FW-Static
X-Content-Security-Policy
X-PhApp
X-FullPageCaching
X-Webcom-Cache-Status
X-HS-Cache-Config
MicrosoftOfficeWebServer
X-HS-Content-Id
X-Safe-Firewall
X-CF-Powered-By
SPIisLatency
X-Hits
SPRequestDuration
Request-Context
Access-Control-Max-Age
X-INKT-URI
X-INKT-SITE
X-PHP-Backend
X-Newrelic-App-Data
X-BC-Stapler
Composed-By
Access-Control-Expose-Headers
X-Swift-CacheTime
X-Swift-SaveTime
EagleId
Served-By
Grace
X-SERVER
X-CDN-Pop
X-CDN-Pop-IP
Liferay-Portal
X-Tumblr-Pixel-4
X-Spip-Cache
X-Hyper-Cache
X-Backend-Server
X-Dw-Request-Base-Id
X-Device
X-Server-Name
X-LiteSpeed-Cache-Control
X-Fastly-Request-ID
X-Microcache
X-VCache
X-ServerName
X-FB-Debug
X-Cloud-Trace-Context
Content-Style-Type
X-RateLimit-Remaining
X-Clacks-Overhead
X-RateLimit-Limit
Content-Script-Type
Rating
X-Firenze-Processing-Times
X-RateLimit-Reset
X-Jimdo-Wid
X-Jimdo-Instance
Surrogate-Control
X-TNCMS
X-Acc-Exp
X-Loop
Real-Hostname
Refresh
Front-End-Https
X-DDC-Arch-Trace
X-User-Agent
Public-Key-Pins
X-Wix-Renderer-Server
X-Cache-Config
X-HS-Combine-CSS
X-XN-XNHTML
X-XN-Trace-Token
Xkey
X-StackifyID
X-Middleton-Display
X-Middleton-Response
X-Tumblr-Content-Rating
X-Sol
X-DNS-Prefetch-Control
Response
Display
X-Age
Fpc-Cache-Id
X-Hostname
X-SS-Conf
X-SS-Location
X-Vtex-Processado-Em
X-Generated-By
X-Zen-Fury
X-Microcachable
X-Cdn
X-N-OperationId
X-Cached
X-Servedby
X-Px
X-OneAgent-JS-Injection
X-Tumblr-Pixel-5
PageSpeed
X-Topify-Platform
X-Cached-By
X-Frame-Option
X-MiniProfiler-Ids
X-WebKit-CSP
X-Request-Time
X-Url
TCN
X-Correlation-Id
X-Amz-Version-Id
X-Handled-By
X-Whom
P-WS
P-LB
X-Kinsta-Cache
X-Ruxit-JS-Agent
X-CMS-Version
Rt-Fastcgi-Cache
X-Magento-Tags
X-Varnish-TTL
X-Outils-CS
Product
X-Content-Options
X-Msg-2-Log
X-DynaTrace-JS-Agent
X-From
X-URL
X-VARNISH-Cache
Surrogate-Key
Imagetoolbar
X-Via-JSL
X-DynaTrace
X-FORWARDED-FOR
X-B-Cache
Edge-Control-Message
X-AspNetWebPages-Version
Access-Control-Request-Method
Host
Powered
ServedBy
X-Varnish-Cache-Hits
X-Engine
X-SRCache-Fetch-Status
Fastly-Debug-Digest
X-SRCache-Store-Status
X-CacheServer
X-HOST
X-Recruiting
X-Forwarded-For
X-Debug-Info
X-Edge-Location
X-Track
X-Cache-Rule
No
X-VTEX-Janus-Router-Backend-App
X-Powered-By-VTEX-Janus-ApiCache
Alternate-Protocol
X-VTEX-Cache-Status-Janus-ApiCache
X-Vtex-Remote-Cache
X-Vtex-Processed-At
Fhost
X-NWS-LOG-UUID
X-LBLID
X-PERF
X-ApacheServer
X-Umbraco-Version
X-Goog-Hash
DynaTrace
Generator
Public-Key-Pins-Report-Only
X-Actual-URL
X-Returned-From-DLL
X-Passed-To-DLL
X-Original-Request
X-Returned-From
X-Passed-To
X-Powered-By-VTEX-Janus-Edge
X-Signature
X-Passed-To-PostProcessResponse
X-Passed-To-BeforeDispatch
X-Returned-From-PostProcessResponse
X-Returned-From-BeforeDispatch
X-Location-Id
X-Varnish-Beresp-Ttl
X-Varnish-Beresp-Status
X-Varnish-Beresp-Grace
X-Application-Context
WZWS-RAY
X-Powered-By-360WZB
X-Stale
Dmn
X-Accel-Expires
X-Platform
X-Micro-Cache
X-Upstream
X-Hosted-By
Arr-Disable-Session-Affinity
X-Cache-Age
X-Developer
Akamai-IP
X-Response-Time
X-Pantheon-Environment
Surrogate-Key-Raw
X-UD-Method
X-RESOURCE
X-Pantheon-Phpreq
X-Supported-By
X-Pantheon-Site
HTTPS
X-Instart-Request-ID
X-Platform-Router
Fastcgi-Cache
X-Platform-Processor
X-Source
X-LW-Cache
X-Cache-Info
X-Version
X-LB
X-Varnish-Host
X-URLSCHEME
X-Platform-Cluster
X-Tumblr-Pixel-6
X-TransIP-Balancer
X-Rocket-Nginx-Bypass
Content-Hash
X-HS-Content-Campaign-Id
Retry-After
X-Device-Type
X-Shop-Id
Origin
X-I-Sp
X-Varnish-Count
X-Varnish-HitMiss
X-S
X-Cache-TTL
X-Defender
X-BS
X-Rnd
X-Dispatcher
Cache-Provider
X-NetCat-Version
X-Magento-Cache-Debug
X-CSRF-Protection
X-Storage
X-AOL-HN
X-Fastcgi-Cache
X-Art-Request-Id
X-I
X-EdgeConnect-Origin-MEX-Latency
X-TransIP-Backend
X-Cache-Key
X-F-Cache
X-Matrix-Server
X-Matrix-Proxy
USPLoggingUUID
X-ATG-Version
X-Powered-By-VelaWeb
X-App-Hosting
Version
X-Gamma-Serve
X-EdgeConnect-MidMile-RTT
X-Page-Cache
Last-Published
X-Cache-Tags
X-Translation
X-Varnish-ObjectSource
X-Varnish-RemainingLife
X-Front
X-Varnish-GracePeriod
X-Varnish-Seen-By
X-Varnish-RemainingTTL
X-Daa-Tunnel
X-Microcache-Status
X-Server-ID
Ohc-File-Size
X-LB-Node
X-Expires-Orig
X-Environment
IBM-Web2-Location
Powered-By-ChinaCache
RTSS
X-Url-Base
Content-Disposition
X-Drupal-Cache-Tags
X-Ua-Device
Pagespeed
Allow
Pool
X-Director
X-Hypernode
X-Revision
X-Platform-Server
Cache-Key
X-Server-Upstream
X-ARC
Page-Completion-Status
X-Vcap-Request-Id
X-Cache-Operation
X-Flow-Powered
X-Varnish-Age
Content-MD5
X-Content-Encoded-By
X-SSL-Protocol
MIME-Version
X-SSL-Cipher
X-Route-Server
X-Cache-Debug
SSPAppContext
X-Platform-Cache
X-Loopia-Node
X-Abgroup
X-Dispatch
X-Lambda-Id
Wsr-Cache
X-SV-FromDBCache
X-SV-Nginx-Duration
X-UPSTREAM
X-SV-Pid
X-Cache-Only-Varnish
X-SV-Cacheable
X-SV-Duration
X-SV-CreatedAt
X-SV-CacheTags
Node
X-SV-Edge
X-SV-Expires
X-Github-Request-Id
Lsrequestid
X-NoCache
X-Ttl
X-Grace
X-Edge-IP
Accept-Encoding
X-Debug
X-Drupal-Cache-Contexts
X-Varnish-Cacheable
X-GeoIP-Country-Code
X-ORACLE-DMS-ECID
X-Generated
X-Hiawatha-Cache
X-Cache-Lifetime
X-Nbs
Section-Io-Id
X-Cache-Control-Orig
X-Litespeed-Cache
Pv
X-Id
X-IsCacheURL
X-Firenze-Processing-Time
X-Cache-Server
Fw-Via
Content-Encoding-Handler
X-RequestId
X-Nginx-Cache
X-Cache-Expires
Srv
X-Sentry-ID
Location
ServerID
X-Ezoic-Cdn
Proxy-Connection
X-ACMCache
X-Vhost
X-CJ-Soft
X-Sapient
X-Client-IP
X-N
X-PwB-Node
X-Proxy
X-SRCache-Key
X-Cache-Engine
FAI-W-FLOW
X-Dns-Prefetch-Control
X-Discourse-Route
ServerName
Backend
X-SERVER-NAME
SN
X-Duration
Cneonction
X-Magento-Cache-Control
S-Cnection
X-Amz-Meta-S3cmd-Attrs
X-Cache-Type
X-VTEX-Cache-Status-Janus-Edge
X-Processing-Time
Nodo
X-Geo-Country
X-TTL
X-Server-Id
X-Varnish-Url
X-Speed-Cache
X-Akamai-Device-Model
X-Speed-Cache-Key
X-NB-Cached-Page
X-ServerID
If-Modified-Since
X-Akamai-Device-Characteristics
Author
X-Middleware-Start
Server-Name
X-Country-Code
Req-Id
X-Browser
X-Location
IM-Version
X-Goog-Metageneration
X-Content-Age
X-Goog-Generation
X-Cookie-Domain
X-Orig-Vary
X-Dynatrace-Js-Agent
X-Yadis-Location
X-Goog-Stored-Content-Encoding
X-Forwarded-Proto
X-Goog-Storage-Class
X-Goog-Stored-Content-Length
X-GUploader-UploadID
X-GeoIP-Country-Name
SRV
X-Varnish-Backend
X-Time
X-Cache-Control
X-Cache-Level
PICS-Label
X-Worker
X-Magnolia-Registration
Use-Proxy
Cm-Server
X-Cache-Namespace
X-Sucuri-ID
X-Pressidium-NinukisWP-Ver
AMF-Ver
X-Always-Cache
X-Correlation-ID
Server-Info
X-Cache-PageType
X-Cache-Fix
X-Cache-CFC
X-FW
HCVer
X-Framework
X-Webkit-CSP
Accept-Charset
NnCoection
Cached
X-Akamai-Transformed
HAVer
X-BackendServer
X-Real-Server
X-App-Server
X-Shield-Request-Id
X-High-Performance
X-Cluster-Node
X-CF-Passed-Proto
X-Processed-By
X-SO
S
X-Frontend
X-Varnish-Retries
Qs-Cache
X-Abuse
Cache
X-Adobe-Content
X-Cache-Device-Type
X-Adobe-Loc
X-Empowered-By
X-Ss-Location
Thanks
X-Sucuri-Cache
X-Srv
Pf.Web.Request.Id
X-DealerOn
Xc-Version
X-Purge-URL
X-Ss-Conf
X-JG-Page-Cache
X-BKSrc
Local-Info
X-Amz-Storage-Class
X-Server-IP
X-Session-ID
X-CDN-Forward
SVR
X-Runtime-Rack
Pics-Label
X-Config-Blacklist-Version
X-Route-To
X-Traffic
Server-Timing
X-Last-Modified
NetMindSessionID
X-Purge-Host
SEOMOZ
MJ12bot
X-Sys-Req-ID
SiteSpeed
X-LB-Server
X-Fastly-Request-Id
MC
X-Origin
A-Powered-By
X-Litespeed-Cache-Control
X-Drectory-Script
X-SRV
X-Cf-Powered-By
X-ClientSide-Caching
W
X-Varnish-IP
X-FastCGI-Cache
Magicmarker
X-Content-Type-Option
X-WR-Flags
X-AF-Userserver
X-Cache-Handler
X-FTR-Request-ID
EagleEye-TraceId
X-DataDome
Tracecode
X-SDS
X-Rocket-Nginx-Serving-Static
HitType
Keywords
X-Balanceador
X-PF-Uncompressing
Eomportal-Instance
Frame-Options
Nitro-Cache
WWW-Authenticate
P-ID
X-AEM
X-VARITI-CCR
X-FireWall-Port
Cache-Tag
X-Yottaa-Optimizations
X-Yottaa-Metrics
X-Varnish-ID
X-Twitter-Response-Tags
CacheControlHeader
X-Disney-Akamai-Rule
X-Connection-Hash
X-Mobilized-By
Content-Transfer-Encoding
X-Runtime-Memory
X-Transaction
X-LP
X-HW
X-Client-Vid
X-EPiphany-Vid
X-Directory-Script
Cache-Tags
X-Client-Image-Vid
X-Cache-TTL-Remaining
X-App-Status
X-Domain-Checked
ServerTokens
X-Hit-Cache
X-Content-Security-Policy-Report-Only
X-RiS-UFDI
X-NginX-Cache
Description
Max-Age
X-HTML-Minification-Powered-By
X-Pagename
X-ASAP-Cache
X-Rq
Ufe-Result
X-Provisioner-Version
ServerSignature
X-Clara-ASAP
X-Cache-Doesi
X-HOSTNAME
X-Varnish-Hits
X-ORACLE-DMS-RID
Adm-Server
Content_type
X-Amz-Meta-Cb-Modifiedtime
X-ID
Web-App-Origin-Name
X-WN-ClientGroup
WN
X-Avg-Cookie-Expires
X-Akamai-Edgescape
VANITY-HOST
X-VNode
X-AVG-Country-Code
X-Redman-Backend
X-Redman-Final-Url
Backend-Timing
X-Analytics
X-Unique-ID
X-ARRServer
AC-ELC
X-Sorting-Hat-Expire-Cache
Proxy-Agent
X-Unbounce-VisitorID
X-Unbounce-Variant
X-WPL-DATA
X-Webstats-RespID
X-Varnish-Ttl
X-Unbounce-PageId
X-Server-Instance
Contao-Page-Layout
X-LW-Web-Server
X-Generated-Time
X-OpenCart-Lightning
NODE
From-Origin
X-Garden-Version
X-HP-Trace-ID
X-CAPServer
X-HP-Trace-Project
X-Mobile-URL
Front
X-Varnish-Hostname
X-ServerIndex
Noq
X-PRAM
SBGI-1
Ram
Play-Detected-UserAgent
X-Varnish-Debug-TTL
SBGI-10
X-MAT-GEO
SBGI-5
SBGI-Device
X-Debug-Token
X-GoCache-CacheStatus
SBGI-RealPath
X-Jphone-Copyright
X-Desc
SBGI-9
X-CB-Server
SBGI-7
X-Force
X-Key
X-MCB-Server
X-Page
SBGI-RenderTime
X-Varnish-Debug-Age
Play-Detected-Device
X-Atraveo-Expires
X-Atraveo-From-Varnish-Cache
X-Atraveo-Param-Rm
X-Atraveo-Set-Cookie
X-Atraveo-ETag
X-Remote-Addr
Dispatcher
BALANCEDTO
X-Source-ID
Ramp
X-Atraveo-TTL
X-Atraveo-Cache-Control
Hname
X-GeoIP
X-Atraveo-Zone
X-Webkit-Csp
X-Atraveo-Varnish-Server-Id
X-Culture
Machine
X-App-Runtime
SERVER-ID
X-Runtime-Affili
X-Resty-Request-Id
X-Nginx-Host
Beyond-Iis
X-Esi
X-Fedora-School-Id
X-Backend-Status
NLCacheNote
X-Smartcache-Timeout
X-Smartcache-Keys
X-Compressed-By
X-NginX-Server
X-Real-IP
X-Plat
X-Env
From
Access-Control-Allow-Header
Smug-CDN
Resin-Trace
X-Wikidot-Backend
Disablevcache
SHInfo
SG
X-Cache-Node
Paypal-Debug-Id
X-Wikidot-Static-Cache
X-Detected-Device
TC-S-Cache-M
X-WP
TC-S-Cache
TC-Cache-U
TC-Cache
TC-Cache-IC
X-CacheResult
XDomainRequestAllowed
Strikingly-Cached-Version
Strikingly-Cached
X-TTFB
X-Symfony-Cache
X-SmugMug-Values
Strikingly-Cache-Region
X-TTFB-L
X-Resolver-IP
X-Varnish-Server
X-Cache-Keep
X-Machine-Name
X-HydroSheep
X-App
X-SmugMug-Hiring
Cteonnt-Length
X-ENV
X-Hrouter
Og
X-Frames-Options
X-Trace-Id
X-Hstore
X-Distributor
X-Autoru-LB
MW-Webserver
X-VC-TTL
X-Autoru-Host
X-Stage
X-AutoRu-App-Id
X-Airee-Node
X-Proto
Lb
MS-CV
Worker
X-Cms-Mode
Fastly-Backend-Name
X-V
X-Wix-Punisher
X-Dev
Custom-Header
AMP-Access-Control-Allow-Source-Origin
Bios
Id
Web
Cmstype
X-Varnish-Ip
X-A
Device
Dis-Env
X-VC-Enabled
X-Fstrz
Cmsid
X-IIJ-Cache
X-KoobooCMS-Version
Ews
X-EC2-Instance-Id
X-RDP
COMMERCE-SERVER-SOFTWARE
X-Confluence-Request-Time
X-TB-M
X-Bip
X-Render-Time
X-Captured
X-E
X-Req-Head-Response
X-Batcache-Reason
X-Batcache
X-Cache-On
X-Viator-Tapersistentcookie
X-OPNET-Transaction-Trace
X-SmartBan-URL
Myheader
Traffic-Origin
PagesDisplayed
X-SmartBan-Host
X-Data-Request
X-Aramark-SID
X-HashTwo
X-Origin-Server
X-B2f-Not-Route
OriginServer
X-Info
X-Webcelerate
X-Gyrobase-Publication
X-SH-Cache-Status
X-Adnet
X-DN-Cache-Control
X-Varnish-Cache-Local
CLMOB
X-DTC
X-Proxy-Cache-Key
X-FPC
X-MSEdge-Ref
X-Apm-Telemetry-Syncmark
Arrnode
ViewMode
ClientIP
F5-IpCliente
X-Amcomm-Site
X-Session-Reinit
X-Refresh
Il-Cl
X-Dw-Trace-Id
X-Server-Generated
Gzip
X-Map-Context
Proxy-Cache
X-Akamai-3PM-SW-Version
X-Highwire-RequestId
X-Highwire-SessionId
X-Cache-Dispatcherpragma
X-Cache-Dispatchercachecontrol
Hostname
WebServer
X-Pj-Cache-Status
Service-Worker-Allowed
Home
Content-Server
X-Cache-Extended
X-Cdn-Forward
X-WebKit-CSP-Report-Only
X-Box
Identity
IISExport
FRONT-END-SECUREBROWSER
X-Forwarded-Host
X-GSL-Server
X-Magento-Action
ScoreTracker
X-WR-MODIFICATION
X-Backend-Host
Hamster
X-Hosting-Env
Yoncu-Errno
Nginx-Cache
X-SDE-Name
Ibf5scheme
X-ETag
N365rili
X-Rewrite
X-RealServer
X-Protected-By
X-WA-Info
X-Unique-Id
X-HostName
X-Goog-Meta-Replace
X-W3TC-Minify
X-Cocoon-Version
Url
X-UA
X-Avvio-Cms-Cacheload
Xc
X-CACHE-TTL
X-Dynamic-Cache
Cleartype
Warning
X-Rack-Cors
NtCoent-Length
BackendServer
X-Grid-Server
Server-Id
X-Rack-CORS
X-Header
AsisCache
X-PM-ID
RN-Server
X-Goog-Meta-Policy
Serverid
X-Secret
X-Src-Webcache
X-Timestamp
X-Rebelmouse-Cache-Control
Hummingbird-Cache
X-Cache-TTL-Current
X-Rebelmouse-Surrogate-Control
X-Cache-Via
X-Your-GrandPa-Would-Wait
X-RemovedCookies
X-TTL-Age
X-IP
X-ProcessESI
X-Would-Your-GrandPa-Wait
X-Machine
X-Cache-TTL-Age
Session-From
X-Tag-Playlist
X-Magento-Lifetime
X-Author
X-LBPoolMember
X-Gateway-Cache-Status
X-Ser
X-Old-Content-Length
X-Gateway-Cache-Key
X-CacheID
TP-Cache
ServerIP
X-Cache-Id
X-Beatles
Aoestatic
X-Response
X-Nginx
X-Zendesk-Origin-Server
X-Flex-Lang
X-Flex-Lastmod
X-Flex-Tag
X-Flex-Evstart
X-Flex-Evend
User-Agent
X-Flex-Community
X-Flex-Tags
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