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pages.optimizely.com Open in urlscan Pro
104.17.70.206  Public Scan

Go To Rescan Add Verdict Report
Submitted URL: https://hithere.episerver.com/api/mailings/unsubscribe/PMRGSZBCHI4TSMZRG4YCYITPOJTSEORCGBSDMYRXHA2DOLLEGI3TOLJUMFRGILLBMI4WELJ...
Effective URL: https://pages.optimizely.com/UnsubscribePage.html
Submission: On June 29 via manual from IE — Scanned from DE
 Behaviour Indicators
Similar DOM Content API
Verdicts

Summary

This website contacted 3 IPs in 3 countries across 4 domains to perform 9 HTTP transactions. The main IP is 104.17.70.206, located in and belongs to CLOUDFLARENET, US. The main domain is pages.optimizely.com. The Cisco Umbrella rank of the primary domain is 600254.
TLS certificate: Issued by Cloudflare Inc ECC CA-3 on August 2nd 2021. Valid for: a year.
This is the only time pages.optimizely.com was scanned on urlscan.io!

urlscan.io Verdict: No classification

Domain & IP information

IP Address AS Autonomous System
1 1 54.167.136.12 14618 (AMAZON-AES)
1 1 151.101.193.174 54113 (FASTLY)
2 2 2606:4700:440... 13335 (CLOUDFLAR...)
6 104.17.70.206 13335 (CLOUDFLAR...)
2 104.111.234.67 16625 (AKAMAI-AS)
1 192.28.147.68 15224 (OMNITURE)
9 3
1    54.167.136.12 (United States)

ASN14618 (AMAZON-AES, US)
PTR: ec2-54-167-136-12.compute-1.amazonaws.com
hithere.episerver.com
1    151.101.193.174 (United States)

ASN54113 (FASTLY, US)
www.episerver.com
2    2606:4700:4400::6812:2987 (United States)

ASN13335 (CLOUDFLARENET, US)
www.optimizely.com
6    104.17.70.206 (None, )

ASN13335 (CLOUDFLARENET, US)
pages.optimizely.com
2    104.111.234.67 (Frankfurt am Main, Germany)

ASN16625 (AKAMAI-AS, US)
PTR: a104-111-234-67.deploy.static.akamaitechnologies.com
munchkin.marketo.net
1    192.28.147.68 (United States)

ASN15224 (OMNITURE, US)
947-rke-048.mktoresp.com
Apex Domain
Subdomains		 Transfer
8 optimizely.com
www.optimizely.com — Cisco Umbrella Rank: 255932
pages.optimizely.com — Cisco Umbrella Rank: 600254
120 KB
2 marketo.net
munchkin.marketo.net — Cisco Umbrella Rank: 3505
6 KB
2 episerver.com
hithere.episerver.com
www.episerver.com — Cisco Umbrella Rank: 700050
353 B
1 mktoresp.com
947-rke-048.mktoresp.com — Cisco Umbrella Rank: 792594
318 B
9 4
Domain Requested by
6 pages.optimizely.com pages.optimizely.com
2 munchkin.marketo.net pages.optimizely.com
munchkin.marketo.net
2 www.optimizely.com 2 redirects
1 947-rke-048.mktoresp.com munchkin.marketo.net
1 www.episerver.com 1 redirects
1 hithere.episerver.com 1 redirects
9 6

This site contains no links.

Subject Issuer Validity Valid
pages.optimizely.com
Cloudflare Inc ECC CA-3		 2021-08-02 -
2022-08-01		 a year crt.sh
*.marketo.net
DigiCert SHA2 Secure Server CA		 2022-02-06 -
2023-02-07		 a year crt.sh
*.mktoresp.com
DigiCert TLS RSA SHA256 2020 CA1		 2021-11-30 -
2022-11-30		 a year crt.sh

This page contains 1 frames:

Primary Page: https://pages.optimizely.com/UnsubscribePage.html
Frame ID: 49D59799EE915F890C0EAE05A3DA41D8
Requests: 9 HTTP requests in this frame

Screenshot
Live screenshot
Full Image

Page URL History Show full URLs

  1. https://hithere.episerver.com/api/mailings/unsubscribe/PMRGSZBCHI4TSMZRG4YCYITPOJTSEORCGBSDMYRXHA2DOLLEGI3... HTTP 302
    https://www.episerver.com/unsubscribe HTTP 301
    https://www.optimizely.com/unsubscribe/ HTTP 301
    https://www.optimizely.com/newsletter/unsubscribe/ HTTP 301
    https://pages.optimizely.com/UnsubscribePage.html Page URL

Detected technologies

Overall confidence: 100%
Detected patterns
  • munchkin\.marketo\.\w+/(?:([\d.]+)/)?munchkin\.js
Overall confidence: 100%
Detected patterns
  • optimizely\.com.*\.js

Page Statistics

9
Requests

100 %
HTTPS

17 %
IPv6

4
Domains

6
Subdomains

3
IPs

3
Countries

126 kB
Transfer

290 kB
Size

6
Cookies

Page URL History

This captures the URL locations of the websites, including HTTP redirects and client-side redirects via JavaScript or Meta fields.

  1. https://hithere.episerver.com/api/mailings/unsubscribe/PMRGSZBCHI4TSMZRG4YCYITPOJTSEORCGBSDMYRXHA2DOLLEGI3TOLJUMFRGILLBMI4WELJSMY4WKMJRMI3DAZTBMYRCYITWMVZHG2LPNYRDUIRUEIWCE43JM4RDUITIIVHTI4SBMEZUWLKENB4FC43WGBCDK4JSJJEEOYZRMRXTAVSXKFBG2RKBONWWKMSQPFGT2IT5 HTTP 302
    https://www.episerver.com/unsubscribe HTTP 301
    https://www.optimizely.com/unsubscribe/ HTTP 301
    https://www.optimizely.com/newsletter/unsubscribe/ HTTP 301
    https://pages.optimizely.com/UnsubscribePage.html Page URL

Redirected requests

There were HTTP redirect chains for the following requests:

9 HTTP transactions

Resource
Path		 Size
x-fer		 Type
MIME-Type
Primary Request UnsubscribePage.html
pages.optimizely.com/
Redirect Chain
  • https://hithere.episerver.com/api/mailings/unsubscribe/PMRGSZBCHI4TSMZRG4YCYITPOJTSEORCGBSDMYRXHA2DOLLEGI3TOLJUMFRGILLBMI4WELJSMY4WKMJRMI3DAZTBMYRCYITWMVZHG2LPNYRDUIRUEIWCE43JM4RDUITIIVHTI4SBMEZUWL...
  • https://www.episerver.com/unsubscribe
  • https://www.optimizely.com/unsubscribe/
  • https://www.optimizely.com/newsletter/unsubscribe/
  • https://pages.optimizely.com/UnsubscribePage.html
14 KB
5 KB 		Document
General
Check archive.org
Download Go to
Full URL
https://pages.optimizely.com/UnsubscribePage.html
Protocol
H2
Security
TLS 1.2, ECDHE_ECDSA, AES_128_GCM
Server
104.17.70.206 -, , ASN13335 (CLOUDFLARENET, US),
Reverse DNS
Software
cloudflare /
Resource Hash
979845c1dc1f4325bb285fd3abba82276628ac850c427e11481911650ccd0445
Security Headers
Name Value
X-Content-Type-Options nosniff

Request headers

Upgrade-Insecure-Requests
1
User-Agent
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.5060.53 Safari/537.36
accept-language
de-DE,de;q=0.9

Response headers

cache-control
stale-while-revalidate=60, max-age=300, public
cf-cache-status
DYNAMIC
cf-ray
722db29c2c8068e5-FRA
content-encoding
gzip
content-type
text/html; charset=utf-8
date
Wed, 29 Jun 2022 09:39:55 GMT
expect-ct
max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
p3p
CP="CAO CURa ADMa DEVa TAIa OUR IND UNI COM NAV INT"
server
cloudflare
vary
*,Accept-Encoding
x-asset-type
LP
x-content-type-options
nosniff

Redirect headers

access-control-expose-headers
Request-Context
cache-control
no-cache
cf-cache-status
MISS
cf-ray
722db29aba25920e-FRA
content-length
166
content-type
text/html; charset=utf-8
date
Wed, 29 Jun 2022 09:39:54 GMT
env
Production - Production
expect-ct
max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
expires
-1
location
https://pages.optimizely.com/UnsubscribePage.html
pragma
no-cache
request-context
appId=cid-v1:c9cf88d3-20db-452d-a60c-76c34613f276
server
cloudflare
strict-transport-security
max-age=31536000; includeSubDomains
vary
Accept-Encoding
x-content-type-options
nosniff
x-frame-options
SAMEORIGIN
x-ua-compatible
IE=Edge
x-xss-protection
1; mode=block
Optimizely-logo-color-2021.png
pages.optimizely.com/rs/947-RKE-048/images/ 		42 KB
43 KB 		Image
General
Check archive.org
Download Go to Show image
Full URL
https://pages.optimizely.com/rs/947-RKE-048/images/Optimizely-logo-color-2021.png
Requested by
Host: pages.optimizely.com
URL: https://pages.optimizely.com/UnsubscribePage.html
Protocol
H2
Security
TLS 1.2, ECDHE_ECDSA, AES_128_GCM
Server
104.17.70.206 -, , ASN13335 (CLOUDFLARENET, US),
Reverse DNS
Software
cloudflare /
Resource Hash
88b7982ea73cd79c6991b32c2cee34ad16e6a3b180918c0db8782479a51cbf4d
Security Headers
Name Value
X-Content-Type-Options nosniff

Request headers

accept-language
de-DE,de;q=0.9
Referer
https://pages.optimizely.com/UnsubscribePage.html
User-Agent
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.5060.53 Safari/537.36

Response headers

date
Wed, 29 Jun 2022 09:39:55 GMT
x-content-type-options
nosniff
cf-cache-status
REVALIDATED
last-modified
Sat, 25 Jun 2022 03:15:32 GMT
server
cloudflare
etag
"3b20591-a9bc-5e23d198ac47b"
expect-ct
max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
vary
Accept-Encoding
content-type
image/png
cache-control
public, max-age=60
accept-ranges
bytes
cf-ray
722db29ea84768e5-FRA
content-length
43452
expires
Wed, 29 Jun 2022 09:40:55 GMT
forms2.min.js
pages.optimizely.com/js/forms2/js/ 		206 KB
69 KB 		Script
General
Check archive.org
Download Go to
Full URL
https://pages.optimizely.com/js/forms2/js/forms2.min.js
Requested by
Host: pages.optimizely.com
URL: https://pages.optimizely.com/UnsubscribePage.html
Protocol
H2
Security
TLS 1.2, ECDHE_ECDSA, AES_128_GCM
Server
104.17.70.206 -, , ASN13335 (CLOUDFLARENET, US),
Reverse DNS
Software
cloudflare /
Resource Hash
17dc16f203a20131a9dfccce83ed74af83cb9da328011181ca745b7f3a883d08
Security Headers
Name Value
X-Content-Type-Options nosniff

Request headers

accept-language
de-DE,de;q=0.9
Referer
https://pages.optimizely.com/UnsubscribePage.html
User-Agent
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.5060.53 Safari/537.36

Response headers

date
Wed, 29 Jun 2022 09:39:55 GMT
content-encoding
gzip
x-content-type-options
nosniff
cf-cache-status
REVALIDATED
last-modified
Tue, 14 Jun 2022 21:04:07 GMT
server
cloudflare
etag
"20c0b09-3391f-5e16ebec83fc0"
expect-ct
max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
vary
Accept-Encoding
content-type
application/x-javascript
cache-control
public, max-age=14400
cf-ray
722db29ea84868e5-FRA
expires
Wed, 29 Jun 2022 13:39:55 GMT
munchkin.js
munchkin.marketo.net// 		1 KB
1 KB 		Script
General
Check archive.org
Download Go to
Full URL
https://munchkin.marketo.net//munchkin.js
Requested by
Host: pages.optimizely.com
URL: https://pages.optimizely.com/UnsubscribePage.html
Protocol
HTTP/1.1
Security
TLS 1.3, , AES_256_GCM
Server
104.111.234.67 Frankfurt am Main, Germany, ASN16625 (AKAMAI-AS, US),
Reverse DNS
a104-111-234-67.deploy.static.akamaitechnologies.com
Software
AkamaiNetStorage /
Resource Hash
4bf3aca933aa233702f890083af601fb16149ec8a17f8c1b90d30450562bde08

Request headers

accept-language
de-DE,de;q=0.9
Referer
https://pages.optimizely.com/
User-Agent
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.5060.53 Safari/537.36

Response headers

Date
Wed, 29 Jun 2022 09:39:55 GMT
Content-Encoding
gzip
Last-Modified
Fri, 29 Oct 2021 01:24:07 GMT
Server
AkamaiNetStorage
ETag
"461ce1cffaadfebf2e7659745618ba8e:1635470647.434977"
Vary
Accept-Encoding
P3P
policyref="http://www.marketo.com/w3c/p3p.xml", CP="NOI DSP COR NID CURi OUR NOR"
Connection
keep-alive
Accept-Ranges
bytes
Content-Type
application/x-javascript
Content-Length
753
stripmkttok.js
pages.optimizely.com/js/ 		2 KB
844 B 		Script
General
Check archive.org
Download Go to
Full URL
https://pages.optimizely.com/js/stripmkttok.js
Requested by
Host: pages.optimizely.com
URL: https://pages.optimizely.com/UnsubscribePage.html
Protocol
H2
Security
TLS 1.2, ECDHE_ECDSA, AES_128_GCM
Server
104.17.70.206 -, , ASN13335 (CLOUDFLARENET, US),
Reverse DNS
Software
cloudflare /
Resource Hash
f7545b96ed2740220c349ae9deb614faf1f0f211d4cf710788e0790f74cc9715
Security Headers
Name Value
X-Content-Type-Options nosniff

Request headers

accept-language
de-DE,de;q=0.9
Referer
https://pages.optimizely.com/UnsubscribePage.html
User-Agent
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.5060.53 Safari/537.36

Response headers

date
Wed, 29 Jun 2022 09:39:55 GMT
content-encoding
gzip
x-content-type-options
nosniff
cf-cache-status
REVALIDATED
last-modified
Tue, 14 Jun 2022 21:04:07 GMT
server
cloudflare
etag
"1fe0540-602-5e16ebec83fc0"
expect-ct
max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
vary
Accept-Encoding
content-type
application/x-javascript
cache-control
public, max-age=14400
accept-ranges
bytes
cf-ray
722db29eb87968e5-FRA
content-length
678
expires
Wed, 29 Jun 2022 13:39:55 GMT
forms2.css
pages.optimizely.com/js/forms2/css/ 		13 KB
3 KB 		Stylesheet
General
Check archive.org
Download Go to
Full URL
https://pages.optimizely.com/js/forms2/css/forms2.css
Requested by
Host: pages.optimizely.com
URL: https://pages.optimizely.com/js/forms2/js/forms2.min.js
Protocol
H2
Security
TLS 1.2, ECDHE_ECDSA, AES_128_GCM
Server
104.17.70.206 -, , ASN13335 (CLOUDFLARENET, US),
Reverse DNS
Software
cloudflare /
Resource Hash
256e42104f48a5fa80b031da12dc56acde224fba3f9810f8f8192b39136d365a
Security Headers
Name Value
X-Content-Type-Options nosniff

Request headers

accept-language
de-DE,de;q=0.9
Referer
https://pages.optimizely.com/UnsubscribePage.html
User-Agent
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.5060.53 Safari/537.36

Response headers

date
Wed, 29 Jun 2022 09:39:55 GMT
content-encoding
gzip
x-content-type-options
nosniff
cf-cache-status
REVALIDATED
last-modified
Tue, 14 Jun 2022 21:04:07 GMT
server
cloudflare
etag
"20c0b49-3437-5e16ebec83fc0"
expect-ct
max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
vary
Accept-Encoding
content-type
text/css
cache-control
public, max-age=14400
accept-ranges
bytes
cf-ray
722db2a01ac568e5-FRA
content-length
2623
expires
Wed, 29 Jun 2022 13:39:55 GMT
forms2-theme-simple.css
pages.optimizely.com/js/forms2/css/ 		826 B
326 B 		Stylesheet
General
Check archive.org
Download Go to
Full URL
https://pages.optimizely.com/js/forms2/css/forms2-theme-simple.css
Requested by
Host: pages.optimizely.com
URL: https://pages.optimizely.com/js/forms2/js/forms2.min.js
Protocol
H2
Security
TLS 1.2, ECDHE_ECDSA, AES_128_GCM
Server
104.17.70.206 -, , ASN13335 (CLOUDFLARENET, US),
Reverse DNS
Software
cloudflare /
Resource Hash
14c8c62dc692fd8faa04434e3fed25e7c23d596b732f9db88f6e9f9ff5dfa61c
Security Headers
Name Value
X-Content-Type-Options nosniff

Request headers

accept-language
de-DE,de;q=0.9
Referer
https://pages.optimizely.com/UnsubscribePage.html
User-Agent
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.5060.53 Safari/537.36

Response headers

date
Wed, 29 Jun 2022 09:39:55 GMT
content-encoding
gzip
x-content-type-options
nosniff
cf-cache-status
REVALIDATED
last-modified
Tue, 14 Jun 2022 21:04:07 GMT
server
cloudflare
etag
"20c0b48-33a-5e16ebec83fc0"
expect-ct
max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
vary
Accept-Encoding
content-type
text/css
cache-control
public, max-age=14400
accept-ranges
bytes
cf-ray
722db2a01ac968e5-FRA
content-length
242
expires
Wed, 29 Jun 2022 13:39:55 GMT
munchkin.js
munchkin.marketo.net/161/ 		11 KB
5 KB 		Script
General
Check archive.org
Download Go to
Full URL
https://munchkin.marketo.net/161/munchkin.js
Requested by
Host: munchkin.marketo.net
URL: https://munchkin.marketo.net//munchkin.js
Protocol
HTTP/1.1
Security
TLS 1.3, , AES_256_GCM
Server
104.111.234.67 Frankfurt am Main, Germany, ASN16625 (AKAMAI-AS, US),
Reverse DNS
a104-111-234-67.deploy.static.akamaitechnologies.com
Software
AkamaiNetStorage /
Resource Hash
c2aee78040b4ed46c2377e6825db12a9691a2eb584adf338e77312c8978d8537

Request headers

accept-language
de-DE,de;q=0.9
Referer
https://pages.optimizely.com/
User-Agent
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.5060.53 Safari/537.36

Response headers

Date
Wed, 29 Jun 2022 09:39:55 GMT
Content-Encoding
gzip
Last-Modified
Wed, 08 Sep 2021 00:38:21 GMT
Server
AkamaiNetStorage
ETag
"0e0eefac8daf874e8b1aa34aeb160c52:1631061501.737429"
Vary
Accept-Encoding
P3P
policyref="http://www.marketo.com/w3c/p3p.xml", CP="NOI DSP COR NID CURi OUR NOR"
Cache-Control
max-age=8640000
Connection
keep-alive
Accept-Ranges
bytes
Content-Type
application/x-javascript
Content-Length
4681
Expires
Fri, 07 Oct 2022 09:39:55 GMT
visitWebPage
947-rke-048.mktoresp.com/webevents/ 		2 B
318 B 		Ping
General
Check archive.org
Download Go to
Full URL
https://947-rke-048.mktoresp.com/webevents/visitWebPage?_mchNc=1656495595545&_mchCn=UnsubscribePage&_mchId=947-RKE-048&_mchTk=_mch-optimizely.com-1656495595544-16969&_mchWs=j1RR&_mchHo=pages.optimizely.com&_mchPo=&_mchRu=%2FUnsubscribePage.html&_mchPc=https%3A&_mchVr=161&_mchEcid=&_mchHa=&_mchRe=&_mchQp=
Requested by
Host: munchkin.marketo.net
URL: https://munchkin.marketo.net/161/munchkin.js
Protocol
HTTP/1.1
Security
TLS 1.2, ECDHE_RSA, AES_128_GCM
Server
192.28.147.68 , United States, ASN15224 (OMNITURE, US),
Reverse DNS
Software
nginx/1.20.1 /
Resource Hash
565339bc4d33d72817b583024112eb7f5cdf3e5eef0252d6ec1b9c9a94e12bb3

Request headers

accept-language
de-DE,de;q=0.9
Referer
https://pages.optimizely.com/
User-Agent
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.5060.53 Safari/537.36

Response headers

Date
Wed, 29 Jun 2022 09:39:56 GMT
Content-Encoding
gzip
Server
nginx/1.20.1
Transfer-Encoding
chunked
Content-Type
text/plain; charset=UTF-8
Access-Control-Allow-Origin
*
Connection
keep-alive
X-Request-Id
aa6cc2db-982f-4ec7-a615-73bca704a54d

Verdicts & Comments Add Verdict or Comment

15 JavaScript Global Variables

These are the non-standard "global" variables defined on the window object. These can be helpful in identifying possible client-side frameworks and code.

object| oncontextlost object| oncontextrestored function| structuredClone object| launchQueue object| onbeforematch function| getScreenDetails function| queryLocalFonts object| navigation object| MktoForms2 function| mktoMunchkinFunction object| Munchkin function| mktoMunchkin object| MunchkinTracker function| addCaptchaScript object| jQuery11240743178062811112

6 Cookies

Domain/Path Name / Value
www.optimizely.com/ Name: .ASPXANONYMOUS
Value: kCnPBi7C2AEkAAAAMDM1YjI5ZWItMjlmZS00NDM4LTkwZjMtZWZlMTRlOGY5ZDdifYv6CYHqGW_k5JcFEWt2_mWyOSteKOvCvBewMYt-XvU1
.www.optimizely.com/ Name: ARRAffinity
Value: 393133b9ab43e2565bcf207492d3a336c0306cb33b6897762f1769f0eba96935
.www.optimizely.com/ Name: ARRAffinitySameSite
Value: 393133b9ab43e2565bcf207492d3a336c0306cb33b6897762f1769f0eba96935
pages.optimizely.com/ Name: BIGipServersj32web-nginx-app_https
Value: !6+N0wEDG8nSv56DOF/6EdpB26h7ooH6jB31JPHqDpebNBC85/arq7u7/LH4JB+nOok1RhpzYc3ezGWA=
.pages.optimizely.com/ Name: __cf_bm
Value: 5MINUpUSij_rZKbpSSX7Y6z5JcVG7x603nRg131nz_w-1656495595-0-AYmsf9GelRCJmuiaxpQxRHpuH4yltjW0QTpS2PU34KqEMP5FfUL4gmktrDTHHViCSOCckiPtG7nOPFqdpCMdzpA=
.optimizely.com/ Name: _mkto_trk
Value: id:947-RKE-048&token:_mch-optimizely.com-1656495595544-16969

Security Headers

This page lists any security headers set by the main page. If you want to understand what these mean and how to use them, head on over to this page

Header Value
X-Content-Type-Options nosniff