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home-github-io-el3.pages.dev Open in urlscan Pro
2606:4700:310c::ac42:2c9c  Public Scan

Go To Rescan Add Verdict Report
URL: https://home-github-io-el3.pages.dev/
Submission: On June 15 via automatic, source certstream-suspicious — Scanned from DE
 Behaviour Indicators
Similar DOM Content API
Verdicts

Summary

This website contacted 4 IPs in 2 countries across 3 domains to perform 10 HTTP transactions. The main IP is 2606:4700:310c::ac42:2c9c, located in United States and belongs to CLOUDFLARENET, US. The main domain is home-github-io-el3.pages.dev.
TLS certificate: Issued by WE1 on June 12th 2024. Valid for: 3 months.
This is the only time home-github-io-el3.pages.dev was scanned on urlscan.io!

urlscan.io Verdict: No classification

Domain & IP information

IP Address AS Autonomous System
5 2606:4700:310... 13335 (CLOUDFLAR...)
2 154.85.69.55 139057 (LDPL-AS-A...)
1 2404:2280:1cc... 24429 (TAOBAO Zh...)
10 4
Apex Domain
Subdomains		 Transfer
5 pages.dev
home-github-io-el3.pages.dev
14 KB
3 bytecdntp.com
lf9-cdn-tos.bytecdntp.com — Cisco Umbrella Rank: 195272
lf3-cdn-tos.bytecdntp.com — Cisco Umbrella Rank: 173745
lf26-cdn-tos.bytecdntp.com Failed
123 KB
0 imsyy.top Failed
cdn.imsyy.top Failed
10 3
Domain Requested by
5 home-github-io-el3.pages.dev home-github-io-el3.pages.dev
2 lf9-cdn-tos.bytecdntp.com home-github-io-el3.pages.dev
1 lf3-cdn-tos.bytecdntp.com home-github-io-el3.pages.dev
0 lf26-cdn-tos.bytecdntp.com Failed home-github-io-el3.pages.dev
0 cdn.imsyy.top Failed home-github-io-el3.pages.dev
10 5

This site contains no links.

Subject Issuer Validity Valid
pages.dev
WE1		 2024-06-12 -
2024-09-10		 3 months crt.sh
*.bytecdntp.com
RapidSSL TLS RSA CA G1		 2024-05-22 -
2025-05-22		 a year crt.sh

This page contains 1 frames:

Primary Page: https://home-github-io-el3.pages.dev/
Frame ID: EAE91C0E9284322C11EA5427543AB28D
Requests: 11 HTTP requests in this frame

Screenshot
Live screenshot
Full Image

Detected technologies

Overall confidence: 100%
Detected patterns
  • /([\d.]+)/jquery(?:\.min)?\.js
  • jquery.*\.js(?:\?ver(?:sion)?=([\d.]+))?

Page Statistics

10
Requests

80 %
HTTPS

67 %
IPv6

3
Domains

5
Subdomains

4
IPs

2
Countries

137 kB
Transfer

345 kB
Size

0
Cookies

Redirected requests

There were HTTP redirect chains for the following requests:

10 HTTP transactions

Resource
Path		 Size
x-fer		 Type
MIME-Type
Primary Request /
home-github-io-el3.pages.dev/ 		30 KB
6 KB 		Document
General
Check archive.org
Download Go to
Full URL
https://home-github-io-el3.pages.dev/
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
2606:4700:310c::ac42:2c9c , United States, ASN13335 (CLOUDFLARENET, US),
Reverse DNS
Software
cloudflare /
Resource Hash
d87a5ecd5ac248879966ba276354676b5a1945459b5ff021192373e7d21a54b0
Security Headers
Name Value
X-Content-Type-Options nosniff

Request headers

Accept-Language
de-DE,de;q=0.9;q=0.9
Upgrade-Insecure-Requests
1
User-Agent
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36
sec-ch-ua
"Google Chrome";v="126", "Not:A-Brand";v="8", "Chromium";v="126"
sec-ch-ua-mobile
?0
sec-ch-ua-platform
"Win32"

Response headers

access-control-allow-origin
*
alt-svc
h3=":443"; ma=86400
cache-control
public, max-age=0, must-revalidate
cf-ray
89411a490b9865e1-FRA
content-encoding
br
content-type
text/html; charset=utf-8
date
Sat, 15 Jun 2024 08:13:45 GMT
etag
W/"2732d7b9be5943398d9d7bd71e43389f"
nel
{"success_fraction":0,"report_to":"cf-nel","max_age":604800}
referrer-policy
strict-origin-when-cross-origin
report-to
{"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v4?s=g0ReSCBH4IgrUruNhEHfmhJdSj7WPAlaHRI5twHV6%2F1dBxkFrTh46CjeArgGCMGxSvo3qoDUY3mRQWmj6YoQBnLGRrJCKfoiEStlZVmrfZb70zLeV2MSxaWU0IdtJb5IcufAaufZWTpLIv52OaDGzEF4whwtc1x9qpwk"}],"group":"cf-nel","max_age":604800}
server
cloudflare
vary
Accept-Encoding
x-content-type-options
nosniff
jquery.min.js
lf9-cdn-tos.bytecdntp.com/cdn/expire-1-y/jquery/3.5.1/ 		87 KB
88 KB 		Script
General
Check archive.org
Download Go to
Full URL
https://lf9-cdn-tos.bytecdntp.com/cdn/expire-1-y/jquery/3.5.1/jquery.min.js
Requested by
Host: home-github-io-el3.pages.dev
URL: https://home-github-io-el3.pages.dev/
Protocol
H2
Security
TLS 1.2, ECDHE_RSA, AES_128_GCM
Server
154.85.69.55 Singapore, Singapore, ASN139057 (LDPL-AS-AP LEGEND DYNASTY PTE. LTD., SG),
Reverse DNS
Software
nginx /
Resource Hash
f7f6a5894f1d19ddad6fa392b2ece2c5e578cbf7da4ea805b6885eb6985b6e3d

Request headers

sec-ch-ua
"Google Chrome";v="126", "Not:A-Brand";v="8", "Chromium";v="126"
Referer
https://home-github-io-el3.pages.dev/
Accept-Language
de-DE,de;q=0.9;q=0.9
sec-ch-ua-mobile
?0
User-Agent
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36
sec-ch-ua-platform
"Win32"

Response headers

x-ser
BC71_dx-lt-yd-zhejiang-jinhua-12-cache-4, BC5_dx-lt-yd-zhejiang-huzhou-3-cache-7, BC206_dx-lt-yd-jiangsu-huaian-8-cache-12, BC230_FR-Paris-Paris-3-cache-1, BC43_DE-Frankfurt-Frankfurt-11-cache-4
date
Sat, 15 Jun 2024 08:13:47 GMT
x-tt-trace-tag
id=09;cdn-cache=hit;type=static
x-cache
HIT from BC43_DE-Frankfurt-Frankfurt-11-cache-4(cloudsvr)
server-timing
cdn-cache;desc=HIT,edge;dur=2
content-length
89476
last-modified
Wed, 26 Jan 2022 04:20:28 GMT
server
nginx
etag
"61f0cc0c-15d84"
vary
Accept-Encoding, Accept-Encoding
content-type
application/javascript
access-control-allow-origin
*
cache-control
max-age=31536000
x-response-cinfo
80.255.7.118
accept-ranges
bytes
timing-allow-origin
*
x-response-cache
edge_hit
expires
Wed, 04 Jun 2025 04:14:49 GMT
regular.min.css
cdn.imsyy.top/gh/imsyy/file/font/HarmonyOS_Sans/ 		0
0
bootstrap.min.css
lf9-cdn-tos.bytecdntp.com/cdn/expire-1-y/bootstrap/5.1.0/css/ 		159 KB
24 KB 		Stylesheet
General
Check archive.org
Download Go to
Full URL
https://lf9-cdn-tos.bytecdntp.com/cdn/expire-1-y/bootstrap/5.1.0/css/bootstrap.min.css
Requested by
Host: home-github-io-el3.pages.dev
URL: https://home-github-io-el3.pages.dev/
Protocol
H2
Security
TLS 1.2, ECDHE_RSA, AES_128_GCM
Server
154.85.69.55 Singapore, Singapore, ASN139057 (LDPL-AS-AP LEGEND DYNASTY PTE. LTD., SG),
Reverse DNS
Software
TLB /
Resource Hash
cfc391e34328c09f0680ae8ff3d63e86224ae7e71c973147ccb84540b2fdd9b8

Request headers

sec-ch-ua
"Google Chrome";v="126", "Not:A-Brand";v="8", "Chromium";v="126"
Referer
https://home-github-io-el3.pages.dev/
Accept-Language
de-DE,de;q=0.9;q=0.9
sec-ch-ua-mobile
?0
User-Agent
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36
sec-ch-ua-platform
"Win32"

Response headers

x-ser
BC151_dx-lt-yd-jiangsu-huaian-8-cache-6, BC203_dx-lt-yd-jiangsu-huaian-8-cache-12, BC3_DE-Frankfurt-Frankfurt-11-cache-1, BC43_DE-Frankfurt-Frankfurt-11-cache-4
date
Sat, 15 Jun 2024 08:13:47 GMT
content-encoding
gzip
x-tt-trace-tag
id=09;cdn-cache=hit;type=static
x-tt-trace-id
00-2406090116499D34AA2A7FA8761CD90F-2E44BFEF231BA5F1-00
x-cache
HIT from BC43_DE-Frankfurt-Frankfurt-11-cache-4(cloudsvr)
server-timing
cdn-cache;desc=HIT,edge;dur=2
last-modified
Sat, 22 Jan 2022 16:39:00 GMT
server
TLB
x-tt-logid
202406090116499D34AA2A7FA8761CD90F
etag
W/"61ec3324-27ba0"
vary
Accept-Encoding
content-type
text/css
access-control-allow-origin
*
cache-control
max-age=31536000
x-response-cinfo
80.255.7.118
x-response-cache
edge_hit
timing-allow-origin
*
expires
Sun, 08 Jun 2025 18:04:29 GMT
style.css
home-github-io-el3.pages.dev/css/ 		18 KB
5 KB 		Stylesheet
General
Check archive.org
Download Go to
Full URL
https://home-github-io-el3.pages.dev/css/style.css
Requested by
Host: home-github-io-el3.pages.dev
URL: https://home-github-io-el3.pages.dev/
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
2606:4700:310c::ac42:2c9c , United States, ASN13335 (CLOUDFLARENET, US),
Reverse DNS
Software
cloudflare /
Resource Hash
afa92550abf33644176b23fbddc017b8443bac9cf05e30dc4fed806142a07dc1
Security Headers
Name Value
X-Content-Type-Options nosniff

Request headers

sec-ch-ua
"Google Chrome";v="126", "Not:A-Brand";v="8", "Chromium";v="126"
Referer
https://home-github-io-el3.pages.dev/
Accept-Language
de-DE,de;q=0.9;q=0.9
sec-ch-ua-mobile
?0
User-Agent
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36
sec-ch-ua-platform
"Win32"

Response headers

date
Sat, 15 Jun 2024 08:13:47 GMT
content-encoding
br
referrer-policy
strict-origin-when-cross-origin
x-content-type-options
nosniff
nel
{"success_fraction":0,"report_to":"cf-nel","max_age":604800}
server
cloudflare
etag
W/"32ad6616b48aa2000c5ffa3f3fd65624"
vary
Accept-Encoding
report-to
{"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v4?s=h3lRr95bgBnU%2FqJeXvdnB04cp%2BzhLT7QLTlFYQXwAQIAwkiQSvfEwJ%2F16nW%2FqiYauZRcAJgo%2FPmwfyqYDny6y7JrJligAtLVvWW7Puut2nyHhp7rAID%2B1MivSxP1ej5yXlmp%2BGhRURCmgntOZPkt1QLG8u0njwp4FRbV"}],"group":"cf-nel","max_age":604800}
content-type
text/css; charset=utf-8
access-control-allow-origin
*
cache-control
public, max-age=0, must-revalidate
cf-ray
89411a528f6b65e1-FRA
alt-svc
h3=":443"; ma=86400
mobile.css
home-github-io-el3.pages.dev/css/ 		6 KB
2 KB 		Stylesheet
General
Check archive.org
Download Go to
Full URL
https://home-github-io-el3.pages.dev/css/mobile.css
Requested by
Host: home-github-io-el3.pages.dev
URL: https://home-github-io-el3.pages.dev/
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
2606:4700:310c::ac42:2c9c , United States, ASN13335 (CLOUDFLARENET, US),
Reverse DNS
Software
cloudflare /
Resource Hash
ba948857f6b10694f8ea29effcc1f70d067df2445855402ff4f942991eaf6826
Security Headers
Name Value
X-Content-Type-Options nosniff

Request headers

sec-ch-ua
"Google Chrome";v="126", "Not:A-Brand";v="8", "Chromium";v="126"
Referer
https://home-github-io-el3.pages.dev/
Accept-Language
de-DE,de;q=0.9;q=0.9
sec-ch-ua-mobile
?0
User-Agent
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36
sec-ch-ua-platform
"Win32"

Response headers

date
Sat, 15 Jun 2024 08:13:47 GMT
content-encoding
br
referrer-policy
strict-origin-when-cross-origin
x-content-type-options
nosniff
nel
{"success_fraction":0,"report_to":"cf-nel","max_age":604800}
server
cloudflare
etag
W/"335cfbe59a391548a6d1b9401d6cd53c"
vary
Accept-Encoding
report-to
{"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v4?s=yRbcwOt8pWhRr2aQe7rb9Cf3iOBwPB%2F%2BKaEn0COwxdzR%2FU3Gr7cvKZgnl3Mx%2FISmjYbTp1dHkIQVC%2BP3OlNs3Pyw8EfkDhhbKnYSwfk%2FzPkqkTswpF2aEZ%2FEYtEHVQUwDwg5J2BzBQwPAd6KONzqvnlRuPdGD9jeOAtz"}],"group":"cf-nel","max_age":604800}
content-type
text/css; charset=utf-8
access-control-allow-origin
*
cache-control
public, max-age=0, must-revalidate
cf-ray
89411a528f6d65e1-FRA
alt-svc
h3=":443"; ma=86400
loading.css
home-github-io-el3.pages.dev/css/ 		2 KB
1019 B 		Stylesheet
General
Check archive.org
Download Go to
Full URL
https://home-github-io-el3.pages.dev/css/loading.css
Requested by
Host: home-github-io-el3.pages.dev
URL: https://home-github-io-el3.pages.dev/
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
2606:4700:310c::ac42:2c9c , United States, ASN13335 (CLOUDFLARENET, US),
Reverse DNS
Software
cloudflare /
Resource Hash
8bbe918c379c6b5b4680b737db55ef7c85e0fa66e7f6e43821ae523187956125
Security Headers
Name Value
X-Content-Type-Options nosniff

Request headers

sec-ch-ua
"Google Chrome";v="126", "Not:A-Brand";v="8", "Chromium";v="126"
Referer
https://home-github-io-el3.pages.dev/
Accept-Language
de-DE,de;q=0.9;q=0.9
sec-ch-ua-mobile
?0
User-Agent
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36
sec-ch-ua-platform
"Win32"

Response headers

date
Sat, 15 Jun 2024 08:13:47 GMT
content-encoding
br
referrer-policy
strict-origin-when-cross-origin
x-content-type-options
nosniff
nel
{"success_fraction":0,"report_to":"cf-nel","max_age":604800}
server
cloudflare
etag
W/"3cf47baf4891aa91094fd407a054890e"
vary
Accept-Encoding
report-to
{"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v4?s=bfVbq5%2BZHrePtw0%2FHtNZiDMRUdWRORG%2BSSgh%2Fkv0s%2BqKmwjHszjOXSI22CorQmnnwKgbBz6YhfPXvOJ31sD3kMFTtlNFqoJqExun8thjxTBWMKfL1BKJ1BVeQcJWNmXVOihrj980OjzewvBXF6igGtj3hFDIGvJ8MRTC"}],"group":"cf-nel","max_age":604800}
content-type
text/css; charset=utf-8
access-control-allow-origin
*
cache-control
public, max-age=0, must-revalidate
cf-ray
89411a528f6e65e1-FRA
alt-svc
h3=":443"; ma=86400
animation.css
home-github-io-el3.pages.dev/css/ 		1 KB
553 B 		Stylesheet
General
Check archive.org
Download Go to
Full URL
https://home-github-io-el3.pages.dev/css/animation.css
Requested by
Host: home-github-io-el3.pages.dev
URL: https://home-github-io-el3.pages.dev/
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
2606:4700:310c::ac42:2c9c , United States, ASN13335 (CLOUDFLARENET, US),
Reverse DNS
Software
cloudflare /
Resource Hash
1fb89b5a8c4b82898cd639222ad1c5a6221d25bf7b698318fbd755fc3fc341e5
Security Headers
Name Value
X-Content-Type-Options nosniff

Request headers

sec-ch-ua
"Google Chrome";v="126", "Not:A-Brand";v="8", "Chromium";v="126"
Referer
https://home-github-io-el3.pages.dev/
Accept-Language
de-DE,de;q=0.9;q=0.9
sec-ch-ua-mobile
?0
User-Agent
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36
sec-ch-ua-platform
"Win32"

Response headers

date
Sat, 15 Jun 2024 08:13:47 GMT
content-encoding
br
referrer-policy
strict-origin-when-cross-origin
x-content-type-options
nosniff
nel
{"success_fraction":0,"report_to":"cf-nel","max_age":604800}
server
cloudflare
etag
W/"7a7310194642b1d92623e14573c62895"
vary
Accept-Encoding
report-to
{"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v4?s=JslpEP2wdhy18jsl10r82u8iIuYNmWjkBFHLMkOEEz5R%2Bs8rUo6NsYZ%2FTBr3y7Hm%2B59qkjekq0hCSeaqCmeRue%2F2PyNntHj7ra9Yv4P3spdAZSz3I5CGCsUq6ZXKsu2r98uzgspSmgaUZ8sNIRPsPiPvPo0STHQdPARa"}],"group":"cf-nel","max_age":604800}
content-type
text/css; charset=utf-8
access-control-allow-origin
*
cache-control
public, max-age=0, must-revalidate
cf-ray
89411a528f7265e1-FRA
alt-svc
h3=":443"; ma=86400
iziToast.min.css
lf3-cdn-tos.bytecdntp.com/cdn/expire-1-y/izitoast/1.4.0/css/ 		41 KB
11 KB 		Stylesheet
General
Check archive.org
Download Go to
Full URL
https://lf3-cdn-tos.bytecdntp.com/cdn/expire-1-y/izitoast/1.4.0/css/iziToast.min.css
Requested by
Host: home-github-io-el3.pages.dev
URL: https://home-github-io-el3.pages.dev/
Protocol
H2
Security
TLS 1.3, , AES_256_GCM
Server
2404:2280:1cc:0:3::9 , Singapore, ASN24429 (TAOBAO Zhejiang Taobao Network Co.,Ltd, CN),
Reverse DNS
Software
Tengine /
Resource Hash
7fa7d6e3b4039b59b4d4721ea7e523a42a4dc0b56405829df9f8696f8550fa01

Request headers

sec-ch-ua
"Google Chrome";v="126", "Not:A-Brand";v="8", "Chromium";v="126"
Referer
https://home-github-io-el3.pages.dev/
Accept-Language
de-DE,de;q=0.9;q=0.9
sec-ch-ua-mobile
?0
User-Agent
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36
sec-ch-ua-platform
"Win32"

Response headers

date
Sat, 08 Jun 2024 19:51:38 GMT
content-encoding
gzip
via
cache21.l2de2[200,200,200-0,M], cache11.l2de2[201,0], ens-cache2.de5[0,0,200-0,H], ens-cache9.de5[1,0]
x-tt-trace-tag
id=03;cdn-cache=hit;type=static
x-tt-trace-id
00-2406090351389D34AA2A7FA8761DE90E-2E44BFEF231DFE06-00
age
562929
x-swift-cachetime
31536000
x-cache
HIT TCP_HIT dirn:12:530983796
server-timing
inner; dur=12
x-swift-savetime
Sat, 08 Jun 2024 19:51:38 GMT
content-length
10438
last-modified
Fri, 28 Jan 2022 15:47:27 GMT
server
Tengine
x-tt-logid
202406090351389D34AA2A7FA8761DE90E
etag
W/"61f4100f-a221"
vary
Accept-Encoding
ali-swift-global-savetime
1717876298
content-type
text/css
access-control-allow-origin
*
cache-control
max-age=31536000
x-tt-trace-host
011b2e83cdc31e33cd327b516e713709e8da11c89ef1b213379edad7685ae3568fdfb056cc24f59164ca4b7deba339ccbce8dd26d33f91422c2e71030bdb7bff76d5a0342b025d599bc3d9a9315031fa4c
x-response-cinfo
2a01:4a0:1338:93::3
x-response-cache
edge_hit
timing-allow-origin
*, *
eagleid
a3b55c9d17184392274254695e
expires
Sun, 08 Jun 2025 19:49:13 GMT
iziToast.min.js
lf26-cdn-tos.bytecdntp.com/cdn/expire-1-y/izitoast/1.4.0/js/ 		0
0
truncated
/ 		134 B
0 		Image
General
Check archive.org
Download Go to Show image
Full URL
data:truncated
Protocol
DATA
Server
-, , ASN (),
Reverse DNS
Software
/
Resource Hash
6b85e6b94dc9389bde6d5328fbe6d7e3e879f3f5a911eeb9fdfd9788f13b3c0c

Request headers

Accept-Language
de-DE,de;q=0.9;q=0.9
Referer
User-Agent
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Response headers

Content-Type
image/svg+xml

Failed requests

These URLs were requested, but there was no response received. You will also see them in the list above.

Domain
cdn.imsyy.top
URL
https://cdn.imsyy.top/gh/imsyy/file/font/HarmonyOS_Sans/regular.min.css
Domain
lf26-cdn-tos.bytecdntp.com
URL
https://lf26-cdn-tos.bytecdntp.com/cdn/expire-1-y/izitoast/1.4.0/js/iziToast.min.js

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5 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.

undefined| event object| fence object| sharedStorage function| $ function| jQuery

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1 Console Messages

Source Level URL
Text
network error URL: https://cdn.imsyy.top/gh/imsyy/file/font/HarmonyOS_Sans/regular.min.css
Message:
Failed to load resource: net::ERR_NAME_NOT_RESOLVED

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