newsletter.systemdesign.one Open in urlscan Pro
2606:4700:4400::6812:2857 Public Scan

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Submitted URL:
http://newsletter.systemdesign.one/p/caching-patterns
Effective URL:
https://newsletter.systemdesign.one/p/caching-patterns
Submission: On January 03 via api (January 3rd 2024, 4:24:33 pm UTC) from US — Scanned from DE

Summary HTTP 62 Redirects Links 28 Behaviour Indicators

Summary

This website contacted 11 IPs in 2 countries across 11 domains to perform 62 HTTP transactions. The main IP is 2606:4700:4400::6812:2857, located in United States and belongs to CLOUDFLARENET, US. The main domain is newsletter.systemdesign.one.
TLS certificate: Issued by Cloudflare Inc ECC CA-3 on July 28th 2023. Valid for: a year.

This is the only time newsletter.systemdesign.one was scanned on urlscan.io!

urlscan.io Verdict: No classification

Domain & IP information

	IP Address	AS Autonomous System
1 9	2606:4700:440... 2606:4700:4400::6812:2857	13335 (CLOUDFLAR...) (CLOUDFLARENET)
29	2600:9000:21c... 2600:9000:21c7:8200:4:b4b9:d3c0:93a1	16509 (AMAZON-02) (AMAZON-02)
5	2a00:1450:400... 2a00:1450:4001:830::2008	15169 (GOOGLE) (GOOGLE)
2	2a04:4e42::729 2a04:4e42::729	54113 (FASTLY) (FASTLY)
6	2606:4700::68... 2606:4700::6810:3865	13335 (CLOUDFLAR...) (CLOUDFLARENET)
2	13.224.93.118 13.224.93.118	16509 (AMAZON-02) (AMAZON-02)
1	2001:4860:480... 2001:4860:4802:34::36	15169 (GOOGLE) (GOOGLE)
3	2606:4700:440... 2606:4700:4400::6812:21f5	13335 (CLOUDFLAR...) (CLOUDFLARENET)
2	2a00:1450:400... 2a00:1450:4001:811::2002	15169 (GOOGLE) (GOOGLE)
2	2a00:1450:400... 2a00:1450:4001:813::2004	15169 (GOOGLE) (GOOGLE)
2	2a00:1450:400... 2a00:1450:4001:80b::2003	15169 (GOOGLE) (GOOGLE)
62	11

9 2606:4700:4400::6812:2857 (United States) 1 redirects

ASN13335 (CLOUDFLARENET, US)

newsletter.systemdesign.one	Domain lookup VirusTotal SecurityTrails crt.sh Censys Domaintools

29 2600:9000:21c7:8200:4:b4b9:d3c0:93a1 (United States)

ASN16509 (AMAZON-02, US)

substackcdn.com	Domain lookup VirusTotal SecurityTrails crt.sh Censys Domaintools

5 2a00:1450:4001:830::2008 (Frankfurt am Main, Germany)

ASN15169 (GOOGLE, US)

www.googletagmanager.com	Domain lookup VirusTotal SecurityTrails crt.sh Censys Domaintools

2 2a04:4e42::729 (United States)

ASN54113 (FASTLY, US)

js.sentry-cdn.com	Domain lookup VirusTotal SecurityTrails crt.sh Censys Domaintools

6 2606:4700::6810:3865 (United States)

ASN13335 (CLOUDFLARENET, US)

static.cloudflareinsights.com	Domain lookup VirusTotal SecurityTrails crt.sh Censys Domaintools
cloudflareinsights.com	Domain lookup VirusTotal SecurityTrails crt.sh Censys Domaintools

2 13.224.93.118 (United States)

ASN16509 (AMAZON-02, US)
PTR: server-13-224-93-118.zrh50.r.cloudfront.net

www.datadoghq-browser-agent.com	Domain lookup VirusTotal SecurityTrails crt.sh Censys Domaintools

1 2001:4860:4802:34::36 (United States)

ASN15169 (GOOGLE, US)

region1.google-analytics.com	Domain lookup VirusTotal SecurityTrails crt.sh Censys Domaintools

3 2606:4700:4400::6812:21f5 (United States)

ASN13335 (CLOUDFLARENET, US)

substack.com	Domain lookup VirusTotal SecurityTrails crt.sh Censys Domaintools

2 2a00:1450:4001:811::2002 (Frankfurt am Main, Germany)

ASN15169 (GOOGLE, US)

googleads.g.doubleclick.net	Domain lookup VirusTotal SecurityTrails crt.sh Censys Domaintools

2 2a00:1450:4001:813::2004 (Frankfurt am Main, Germany)

ASN15169 (GOOGLE, US)

www.google.com	Domain lookup VirusTotal SecurityTrails crt.sh Censys Domaintools

2 2a00:1450:4001:80b::2003 (Frankfurt am Main, Germany)

ASN15169 (GOOGLE, US)

www.google.de	Domain lookup VirusTotal SecurityTrails crt.sh Censys Domaintools

	Apex Domain Subdomains	Transfer
29	substackcdn.com substackcdn.com — Cisco Umbrella Rank: 22397	2 MB
9	systemdesign.one 1 redirects newsletter.systemdesign.one	41 KB
6	cloudflareinsights.com static.cloudflareinsights.com — Cisco Umbrella Rank: 1429 cloudflareinsights.com — Cisco Umbrella Rank: 1410	14 KB
5	googletagmanager.com www.googletagmanager.com — Cisco Umbrella Rank: 114	367 KB
3	substack.com substack.com — Cisco Umbrella Rank: 20335	10 KB
2	google.de www.google.de — Cisco Umbrella Rank: 4002	563 B
2	google.com www.google.com — Cisco Umbrella Rank: 6	563 B
2	doubleclick.net googleads.g.doubleclick.net — Cisco Umbrella Rank: 68	3 KB
2	datadoghq-browser-agent.com www.datadoghq-browser-agent.com — Cisco Umbrella Rank: 2526	95 KB
2	sentry-cdn.com js.sentry-cdn.com — Cisco Umbrella Rank: 8509	4 KB
1	google-analytics.com region1.google-analytics.com — Cisco Umbrella Rank: 1695	262 B
62	11

	Domain	Requested by
29	substackcdn.com	newsletter.systemdesign.one substackcdn.com substack.com
9	newsletter.systemdesign.one	1 redirects newsletter.systemdesign.one www.datadoghq-browser-agent.com
5	www.googletagmanager.com	newsletter.systemdesign.one substackcdn.com www.googletagmanager.com
4	cloudflareinsights.com	static.cloudflareinsights.com www.datadoghq-browser-agent.com
3	substack.com	substackcdn.com substack.com
2	www.google.de
2	www.google.com
2	googleads.g.doubleclick.net	www.googletagmanager.com
2	www.datadoghq-browser-agent.com	newsletter.systemdesign.one substack.com
2	static.cloudflareinsights.com	newsletter.systemdesign.one substack.com
2	js.sentry-cdn.com	newsletter.systemdesign.one substack.com
1	region1.google-analytics.com	www.googletagmanager.com
62	12

This site contains links to these domains. Also see Links.

Domain
substack.com
substackcdn.com
www.linkedin.com
twitter.com
zaidesanton.substack.com

Subject Issuer	Validity	Valid
newsletter.systemdesign.one Cloudflare Inc ECC CA-3	`2023-07-28` - `2024-07-27`	a year	crt.sh
substackcdn.com Amazon RSA 2048 M02	`2023-03-14` - `2024-04-12`	a year	crt.sh
*.google-analytics.com GTS CA 1C3	`2023-11-20` - `2024-02-12`	3 months	crt.sh
*.sentry-cdn.com GlobalSign Atlas R3 DV TLS CA 2023 Q3	`2023-08-01` - `2024-09-01`	a year	crt.sh
sni.cloudflaressl.com Cloudflare Inc ECC CA-3	`2023-04-10` - `2024-04-09`	a year	crt.sh
*.datadoghq-browser-agent.com DigiCert Global G2 TLS RSA SHA256 2020 CA1	`2023-12-12` - `2024-12-14`	a year	crt.sh
substack.com Cloudflare Inc ECC CA-3	`2023-09-13` - `2024-09-12`	a year	crt.sh
*.g.doubleclick.net GTS CA 1C3	`2023-11-20` - `2024-02-12`	3 months	crt.sh
www.google.com GTS CA 1C3	`2023-11-20` - `2024-02-12`	3 months	crt.sh
www.google.de GTS CA 1C3	`2023-11-20` - `2024-02-12`	3 months	crt.sh

This page contains 2 frames:

Primary Page: https://newsletter.systemdesign.one/p/caching-patterns
Frame ID: 7DD8278D18A78E7E323EDBAC9AA8D579
Requests: 45 HTTP requests in this frame

Frame: https://substack.com/channel-frame
Frame ID: FE0DD85299874FC3B9105F256F9A835E
Requests: 15 HTTP requests in this frame

Screenshot
Live screenshot

Full Image

Page Title

Caching Patterns - by NK - System Design Newsletter

Page URL History Show full URLs

http://newsletter.systemdesign.one/p/caching-patterns HTTP 301
https://newsletter.systemdesign.one/p/caching-patterns Page URL

Detected technologies

Cloudflare Browser Insights (Analytics) Expand

Overall confidence: 100%
Detected patterns

static\.cloudflareinsights\.com/beacon(?:\.min)?\.js

Google Analytics (Analytics) Expand

Overall confidence: 100%
Detected patterns

Google Tag Manager (Tag Managers) Expand

Overall confidence: 100%
Detected patterns

googletagmanager\.com/ns\.html[^>]+></iframe>
googletagmanager\.com/gtm\.js
googletagmanager\.com/gtag/js

Page Statistics

62
Requests

100 %
HTTPS

91 %
IPv6

11
Domains

12
Subdomains

11
IPs

2
Countries

2394 kB
Transfer

6478 kB
Size

14
Cookies

28 Outgoing links

These are links going to different origins than the main page.

URL: https://substack.com/profile/135589200-nk

Search URL Search Domain Scan URL

URL: https://substack.com/@systemdesignone
Title: NK

Search URL Search Domain Scan URL

URL: https://substackcdn.com/image/fetch/f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F22d7fd82-9d46-4e4e-b0a3-4a9270fb0340_600x260.gif

Search URL Search Domain Scan URL

URL: https://www.linkedin.com/in/nk-systemdesign-one/
Title: LinkedIn

Search URL Search Domain Scan URL

URL: https://twitter.com/systemdesign42
Title: Twitter

Search URL Search Domain Scan URL

URL: https://substack.com/profile/121956618-anton-zaides?utm_source=post-reactions-face

Search URL Search Domain Scan URL

URL: https://substack.com/profile/106098672-gregor-ojstersek?utm_source=post-reactions-face

Search URL Search Domain Scan URL

URL: https://substack.com/profile/39079589-ken-harrison?utm_source=post-reactions-face

Search URL Search Domain Scan URL

URL: https://substack.com/profile/167123667-raviraj-achar?utm_source=post-reactions-face

Search URL Search Domain Scan URL

URL: https://substack.com/profile/114554229-sanketh-b-k?utm_source=post-reactions-face

Search URL Search Domain Scan URL

URL: https://substack.com/note/p-137374900/restacks?utm_source=substack&utm_content=facepile-restacks
Title: 3 Restacks

Search URL Search Domain Scan URL

URL: https://substack.com/profile/110240398-duck-dickson

Search URL Search Domain Scan URL

URL: https://substack.com/profile/121956618-anton-zaides

Search URL Search Domain Scan URL

URL: https://zaidesanton.substack.com/?utm_source=substack&utm_medium=web&utm_content=comment_metadata
Title: Writes Leading Developers

Search URL Search Domain Scan URL

URL: https://substack.com/privacy
Title: Privacy

Search URL Search Domain Scan URL

URL: https://substack.com/tos
Title: Terms

Search URL Search Domain Scan URL

URL: https://substack.com/ccpa#personal-data-collected
Title: Collection notice

Search URL Search Domain Scan URL

URL: https://substack.com/signup?utm_source=substack&utm_medium=web&utm_content=footer
Title: Start Writing

Search URL Search Domain Scan URL

URL: https://substack.com/app/app-store-redirect?utm_campaign=app-marketing&utm_content=web-footer-button
Title: Get the app

Search URL Search Domain Scan URL

URL: https://substack.com/
Title: Substack

Search URL Search Domain Scan URL

URL: https://substack.com/sign-in?redirect=%2Fp%2Fcaching-patterns&for_pub=systemdesignone&change_user=false
Title: Already a paid subscriber? Sign in

Search URL Search Domain Scan URL

URL: https://substack.com/sign-in?redirect=%2Fp%2Fcaching-patterns&for_pub=systemdesignone&with_password=true
Title: click here to sign in

Search URL Search Domain Scan URL

Page URL History

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

http://newsletter.systemdesign.one/p/caching-patterns HTTP 301
https://newsletter.systemdesign.one/p/caching-patterns Page URL

Redirected requests

There were HTTP redirect chains for the following requests:

62 HTTP transactions
0 data transactions

Method
Protocol Status Resource
Path Size
x-fer Time
Latency Type
MIME-Type IP
Location

GET
H2

200

Primary Request caching-patterns Show response
newsletter.systemdesign.one/p/
Redirect Chain

http://newsletter.systemdesign.one/p/caching-patterns
https://newsletter.systemdesign.one/p/caching-patterns

217 KB
28 KB

786ms
769ms

Document
text/html

2606:4700:4400::6812:2857
CLOUDFLARENET

General

Check archive.org

Show headers Download Go to

Full URL

https://newsletter.systemdesign.one/p/caching-patterns

Protocol

Security

TLS 1.3, , AES_128_GCM

Server

2606:4700:4400::6812:2857 , United States, ASN13335 (CLOUDFLARENET, US),

Reverse DNS

Software

cloudflare / Express

Resource Hash

d029bcbca312d2c123d3883a7556341b4793bb5d59bb83761d6d6f4933afcb8c

Security Headers

Name	Value
Strict-Transport-Security	max-age=31536000
X-Frame-Options	sameorigin

Request headers

Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.6099.129 Safari/537.36
accept-language: de-DE,de;q=0.9

Response headers

alt-svc: h3=":443"; ma=86400
cache-control: no-cache
cf-cache-status: MISS
cf-ray: 83fc978e6d8939bc-FRA
content-encoding: br
content-type: text/html; charset=utf-8
date: Wed, 03 Jan 2024 16:24:27 GMT
etag: W/"36276-yq3pWXeUjbehTtnALRtkkOmsDFs"
link: <https://substackcdn.com>; rel=preconnect
server: cloudflare
strict-transport-security: max-age=31536000
vary: Accept-Encoding
x-cluster: substack
x-deploy: 06f5ecc18a
x-frame-options: sameorigin
x-powered-by: Express
x-served-by: Substack
x-sub: systemdesignone

Redirect headers

CF-RAY: 83fc978ded1303d0-FRA
Connection: keep-alive
Content-Length: 0
Date: Wed, 03 Jan 2024 16:24:26 GMT
Location: https://newsletter.systemdesign.one/p/caching-patterns
Server: cloudflare
Vary: Accept-Encoding
alt-svc: h3=":443"; ma=86400

GET
H2 200 main.040cf7e878d6eaf219a5.css
substackcdn.com/bundle/theme/ 469 KB
65 KB 76ms
28ms Stylesheet
text/css 2600:9000:21c7:8200:4:b4b9:d3c0:93a1
AMAZON-02

General

Check archive.org

Show headers Download Go to

Full URL: https://substackcdn.com/bundle/theme/main.040cf7e878d6eaf219a5.css
Requested by: Host: newsletter.systemdesign.one
URL: https://newsletter.systemdesign.one/p/caching-patterns
Protocol: H2
Security: TLS 1.3, , AES_128_GCM
Server: 2600:9000:21c7:8200:4:b4b9:d3c0:93a1 , United States, ASN16509 (AMAZON-02, US),
Reverse DNS
Software: AmazonS3 /
Resource Hash: 757838a27fe02232c5a8560ef0036b64c090af034afb365f23ce3a6ca77fed67

Request headers

accept-language: de-DE,de;q=0.9
Referer: https://newsletter.systemdesign.one/
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.6099.129 Safari/537.36

Response headers

date: Wed, 03 Jan 2024 09:59:47 GMT
content-encoding: gzip
via: 1.1 3af85c3075e12aff72b9e148b99d6622.cloudfront.net (CloudFront)
x-amz-cf-pop: AMS54-C1
age: 32509
x-amz-server-side-encryption: AES256
x-cache: Hit from cloudfront
alt-svc: h3=":443"; ma=86400
x-amz-expiration: expiry-date="Mon, 24 Jun 2024 00:00:00 GMT", rule-id="StaticAssetIntelligentTiering"
last-modified: Tue, 26 Dec 2023 22:37:13 GMT
server: AmazonS3
etag: W/"040cf7e878d6eaf219a59dc161ab9307"
vary: Accept-Encoding
content-type: text/css
cache-control: public, max-age=31536000, immutable
x-amz-cf-id: ginJpP-8_Jl81MUoEZe43DDYpJc04DoQbzTxift7SLm3AmKfo4eXRw==

GET
H2 200 main.2d31fd1127f8b51946ac.css
substackcdn.com/bundle/ 339 KB
47 KB 62ms
15ms Stylesheet
text/css 2600:9000:21c7:8200:4:b4b9:d3c0:93a1
AMAZON-02

General

Check archive.org

Show headers Download Go to

Full URL: https://substackcdn.com/bundle/main.2d31fd1127f8b51946ac.css
Requested by: Host: newsletter.systemdesign.one
URL: https://newsletter.systemdesign.one/p/caching-patterns
Protocol: H2
Security: TLS 1.3, , AES_128_GCM
Server: 2600:9000:21c7:8200:4:b4b9:d3c0:93a1 , United States, ASN16509 (AMAZON-02, US),
Reverse DNS
Software: AmazonS3 /
Resource Hash: e53e1b74c9d11e48dfcec15894d0ff6fc026b666901cf20114d9cecbd1fe887d

Request headers

accept-language: de-DE,de;q=0.9
Referer: https://newsletter.systemdesign.one/
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.6099.129 Safari/537.36

Response headers

date: Wed, 03 Jan 2024 08:51:27 GMT
content-encoding: gzip
via: 1.1 3af85c3075e12aff72b9e148b99d6622.cloudfront.net (CloudFront)
x-amz-cf-pop: AMS54-C1
age: 27192
x-amz-server-side-encryption: AES256
x-cache: Hit from cloudfront
alt-svc: h3=":443"; ma=86400
x-amz-expiration: expiry-date="Mon, 24 Jun 2024 00:00:00 GMT", rule-id="StaticAssetIntelligentTiering"
last-modified: Tue, 26 Dec 2023 22:37:13 GMT
server: AmazonS3
etag: W/"a128479479e300accbe8cd25699e4455"
vary: Accept-Encoding
content-type: text/css
cache-control: public, max-age=31536000, immutable
x-amz-cf-id: mereabuUTZB2HGnom0o6veVft3j16iPPb4pTNze9xitUUTbRi0XEuA==

GET
H2 200 js Show response
www.googletagmanager.com/gtag/ 274 KB
91 KB 44ms
24ms Script
application/javascript 2a00:1450:4001:830::2008
GOOGLE

General

Check archive.org

Show headers Download Go to

Full URL

https://www.googletagmanager.com/gtag/js?id=G-99PY3XXQY0&l=GA4DataLayer

Requested by

Host: newsletter.systemdesign.one
URL: https://newsletter.systemdesign.one/p/caching-patterns

Protocol

Security

TLS 1.3, , AES_128_GCM

Server

2a00:1450:4001:830::2008 Frankfurt am Main, Germany, ASN15169 (GOOGLE, US),

Reverse DNS

Software

Google Tag Manager /

Resource Hash

8e705c4e537e3be6de5c0e4f50a1f4a71524319fdc2cc066d1fbbfd2041cac8e

Security Headers

Name	Value
Strict-Transport-Security	max-age=31536000; includeSubDomains
X-Xss-Protection	0

Request headers

accept-language: de-DE,de;q=0.9
Referer: https://newsletter.systemdesign.one/
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.6099.129 Safari/537.36

Response headers

date: Wed, 03 Jan 2024 16:24:27 GMT
content-encoding: br
strict-transport-security: max-age=31536000; includeSubDomains
server: Google Tag Manager
vary: Accept-Encoding
content-type: application/javascript; charset=UTF-8
access-control-allow-origin: *
cache-control: private, max-age=900
access-control-allow-credentials: true
cross-origin-resource-policy: cross-origin
access-control-allow-headers: Cache-Control
content-length: 93101
x-xss-protection: 0
alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
expires: Wed, 03 Jan 2024 16:24:27 GMT

GET
H2 200 https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2Fc2712b01-0000-41f1-94b3-9ae9583e8373_800x800.png
substackcdn.com/image/fetch/w_96,c_limit,f_auto,q_auto:good,fl_progressive:steep/ 2 KB
3 KB 86ms
39ms Image
image/png 2600:9000:21c7:8200:4:b4b9:d3c0:93a1
AMAZON-02

General

Check archive.org

Show headers Download Go to Show image

Full URL

https://substackcdn.com/image/fetch/w_96,c_limit,f_auto,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2Fc2712b01-0000-41f1-94b3-9ae9583e8373_800x800.png

Requested by

Host: newsletter.systemdesign.one
URL: https://newsletter.systemdesign.one/p/caching-patterns

Protocol

Security

TLS 1.3, , AES_128_GCM

Server

2600:9000:21c7:8200:4:b4b9:d3c0:93a1 , United States, ASN16509 (AMAZON-02, US),

Reverse DNS

Software

imgproxy / Express

Resource Hash

b6338c6b15ac6c81b0d3d32894843121c5bcf5fb26a3df7021e2fde50c1b46b9

Security Headers

Name	Value
Content-Security-Policy	script-src 'none'

Request headers

accept-language: de-DE,de;q=0.9
Referer: https://newsletter.systemdesign.one/
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.6099.129 Safari/537.36

Response headers

date: Tue, 21 Nov 2023 21:19:20 GMT
content-security-policy: script-src 'none'
via: 1.1 3af85c3075e12aff72b9e148b99d6622.cloudfront.net (CloudFront)
x-amz-cf-pop: AMS54-C1
age: 3697507
x-powered-by: Express
x-cache: Hit from cloudfront
content-disposition: inline; filename="c2712b01-0000-41f1-94b3-9ae9583e8373_800x800.png"
alt-svc: h3=":443"; ma=86400
content-length: 2495
x-request-id: FOpDaHelYtNDr4MWR4V8n
server: imgproxy
etag: "BFcyhJUgw6kDr9UPxBpSsKXSMElaOAVla8V55nXtu48/RImM5ZTM0Zjc5N2RiNzQ4MDBlMDQ1NDE3ZmYzOGU1N2EwIg"
content-type: image/png
cache-control: public, max-age=31536000
x-amz-cf-id: UdFqP-YhOpurlvRXMxgtpTj1_M1RdABFvlyyMIDZ2ooSbegy3J4y5A==

GET
H2 200 https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F05113b4b-6c44-4216-9080-bfdab2fa8d01_800x800.png
substackcdn.com/image/fetch/w_80,c_limit,f_webp,q_auto:good,fl_progressive:steep/ 1020 B
2 KB 86ms
39ms Image
image/webp 2600:9000:21c7:8200:4:b4b9:d3c0:93a1
AMAZON-02

General

Check archive.org

Show headers Download Go to Show image

Full URL

https://substackcdn.com/image/fetch/w_80,c_limit,f_webp,q_auto:good,fl_progressive:steep/https%3A%2F%2Fsubstack-post-media.s3.amazonaws.com%2Fpublic%2Fimages%2F05113b4b-6c44-4216-9080-bfdab2fa8d01_800x800.png

Requested by

Host: newsletter.systemdesign.one
URL: https://newsletter.systemdesign.one/p/caching-patterns

Protocol

Security

TLS 1.3, , AES_128_GCM

Server

2600:9000:21c7:8200:4:b4b9:d3c0:93a1 , United States, ASN16509 (AMAZON-02, US),

Reverse DNS

Software

imgproxy / Express

Resource Hash

e1058dc4789049cdce9bf2c3e5438c97cce594ac0c414b3aae5442a906ebbf05

Security Headers

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pragma: no-cache
date: Wed, 03 Jan 2024 16:24:28 GMT
content-security-policy: script-src 'none'; object-src 'none'
x-content-type-options: nosniff
server: cafe
content-type: image/gif
p3p: policyref="https://www.googleadservices.com/pagead/p3p.xml", CP="NOI DEV PSA PSD IVA IVD OTP OUR OTR IND OTC"
cache-control: no-cache, no-store, must-revalidate
cross-origin-resource-policy: cross-origin
timing-allow-origin: *
alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
content-length: 42
x-xss-protection: 0
expires: Fri, 01 Jan 1990 00:00:00 GMT

GET
H2 200 /
www.google.de/pagead/1p-user-list/316245675/ 42 B
455 B 39ms
19ms Image
image/gif 2a00:1450:4001:80b::2003
GOOGLE

General

Check archive.org

Show headers Download Go to Show image

Full URL

https://www.google.de/pagead/1p-user-list/316245675/?random=1704299068808&cv=11&fst=1704297600000&bg=ffffff&guid=ON&async=1&gtm=45be3bt0v887153041&u_w=1600&u_h=1200&url=https%3A%2F%2Fnewsletter.systemdesign.one%2Fp%2Fcaching-patterns&frm=0&tiba=Caching%20Patterns%20-%20by%20NK%20-%20System%20Design%20Newsletter&data=event%3Dgtag.config&fmt=3&is_vtc=1&cid=CAQSGwAvHhf_Tm2FWQPb6ZDRpcf95fV88YCThuSWUQ&random=2686975091&rmt_tld=1&ipr=y

Protocol

Security

TLS 1.3, , AES_128_GCM

Server

2a00:1450:4001:80b::2003 Frankfurt am Main, Germany, ASN15169 (GOOGLE, US),

Reverse DNS

Software

cafe /

Resource Hash

ef1955ae757c8b966c83248350331bd3a30f658ced11f387f8ebf05ab3368629

Security Headers

Name	Value
Content-Security-Policy	script-src 'none'; object-src 'none'
X-Content-Type-Options	nosniff
X-Xss-Protection	0

Request headers

accept-language: de-DE,de;q=0.9
Referer: https://newsletter.systemdesign.one/
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.6099.129 Safari/537.36

Response headers

pragma: no-cache
date: Wed, 03 Jan 2024 16:24:28 GMT
content-security-policy: script-src 'none'; object-src 'none'
x-content-type-options: nosniff
server: cafe
content-type: image/gif
p3p: policyref="https://www.googleadservices.com/pagead/p3p.xml", CP="NOI DEV PSA PSD IVA IVD OTP OUR OTR IND OTC"
cache-control: no-cache, no-store, must-revalidate
cross-origin-resource-policy: cross-origin
timing-allow-origin: *
alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
content-length: 42
x-xss-protection: 0
expires: Fri, 01 Jan 1990 00:00:00 GMT

GET
H3 200 js Show response
www.googletagmanager.com/gtag/ Frame FE0D 199 KB
72 KB 15ms
14ms Script
application/javascript 2a00:1450:4001:830::2008
GOOGLE

General

Check archive.org

Show headers Download Go to

Full URL

https://www.googletagmanager.com/gtag/js?id=AW-316245675&l=localGaDataLayer&cx=c

Requested by

Host: www.googletagmanager.com
URL: https://www.googletagmanager.com/gtag/js?id=G-TLW0DF6G5V&l=localGaDataLayer

Protocol

Security

QUIC, , AES_128_GCM

Server

2a00:1450:4001:830::2008 Frankfurt am Main, Germany, ASN15169 (GOOGLE, US),

Reverse DNS

Software

Google Tag Manager /

Resource Hash

5ab2691ca6474030e1a729b3b8d86e98f8ac09e66a1454fe2326bb2864b92cc6

Security Headers

Name	Value
Strict-Transport-Security	max-age=31536000; includeSubDomains
X-Xss-Protection	0

Request headers

accept-language: de-DE,de;q=0.9
Referer: https://substack.com/
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.6099.129 Safari/537.36

Response headers

date: Wed, 03 Jan 2024 16:24:29 GMT
content-encoding: br
strict-transport-security: max-age=31536000; includeSubDomains
cross-origin-resource-policy: cross-origin
alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
content-length: 74142
x-xss-protection: 0
last-modified: Wed, 03 Jan 2024 15:00:00 GMT
server: Google Tag Manager
vary: Accept-Encoding
content-type: application/javascript; charset=UTF-8
access-control-allow-origin: *
cache-control: private, max-age=900
access-control-allow-credentials: true
access-control-allow-headers: Cache-Control
expires: Wed, 03 Jan 2024 16:24:29 GMT

GET
H2 200 / Show response
googleads.g.doubleclick.net/pagead/viewthroughconversion/316245675/ Frame FE0D 3 KB
2 KB 46ms
46ms Script
text/javascript 2a00:1450:4001:811::2002
GOOGLE

General

Check archive.org

Show headers Download Go to

Full URL

https://googleads.g.doubleclick.net/pagead/viewthroughconversion/316245675/?random=1704299069188&cv=11&fst=1704299069188&bg=ffffff&guid=ON&async=1&gtm=45be3bt0v887153041&gcd=11l1l1l1l1&dma_cps=sypham&dma=1&u_w=1600&u_h=1200&url=https%3A%2F%2Fsubstack.com%2Fchannel-frame&ref=https%3A%2F%2Fnewsletter.systemdesign.one%2F&top=https%3A%2F%2Fnewsletter.systemdesign.one%2F&hn=www.googleadservices.com&frm=2&uamb=0&uaw=0&data=event%3Dgtag.config&rfmt=3&fmt=4

Requested by

Host: www.googletagmanager.com
URL: https://www.googletagmanager.com/gtag/js?id=AW-316245675&l=localGaDataLayer&cx=c

Protocol

Security

TLS 1.3, , AES_128_GCM

Server

2a00:1450:4001:811::2002 Frankfurt am Main, Germany, ASN15169 (GOOGLE, US),

Reverse DNS

Software

cafe /

Resource Hash

f2af7ec46f303f068688f02d851363fa993ccc6ebd0a13447f31995f5dc6305f

Security Headers

Name	Value
X-Content-Type-Options	nosniff
X-Xss-Protection	0

Request headers

accept-language: de-DE,de;q=0.9
Referer: https://substack.com/
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.6099.129 Safari/537.36

Response headers

pragma: no-cache
date: Wed, 03 Jan 2024 16:24:29 GMT
content-encoding: br
x-content-type-options: nosniff
server: cafe
content-type: text/javascript; charset=UTF-8
p3p: policyref="https://googleads.g.doubleclick.net/pagead/gcn_p3p_.xml", CP="CURa ADMa DEVa TAIo PSAo PSDo OUR IND UNI PUR INT DEM STA PRE COM NAV OTC NOI DSP COR"
cache-control: no-cache, must-revalidate
cross-origin-resource-policy: cross-origin
content-disposition: attachment; filename="f.txt"
timing-allow-origin: *
alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
content-length: 1278
x-xss-protection: 0
expires: Fri, 01 Jan 1990 00:00:00 GMT

GET
H2 200 /
www.google.com/pagead/1p-user-list/316245675/ Frame FE0D 42 B
108 B 18ms
18ms Image
image/gif 2a00:1450:4001:813::2004
GOOGLE

General

Check archive.org

Show headers Download Go to Show image

Full URL

https://www.google.com/pagead/1p-user-list/316245675/?random=1704299069188&cv=11&fst=1704297600000&bg=ffffff&guid=ON&async=1&gtm=45be3bt0v887153041&u_w=1600&u_h=1200&url=https%3A%2F%2Fsubstack.com%2Fchannel-frame&ref=https%3A%2F%2Fnewsletter.systemdesign.one%2F&frm=2&data=event%3Dgtag.config&fmt=3&is_vtc=1&cid=CAQSKQAvHhf_15Vv2vyLmwnw9NedMPon4umLSvPt72Faax4CUEIRQy-ZPz1e&random=3561578033&rmt_tld=0&ipr=y

Protocol

Security

TLS 1.3, , AES_128_GCM

Server

2a00:1450:4001:813::2004 Frankfurt am Main, Germany, ASN15169 (GOOGLE, US),

Reverse DNS

Software

cafe /

Resource Hash

ef1955ae757c8b966c83248350331bd3a30f658ced11f387f8ebf05ab3368629

Security Headers

Name	Value
Content-Security-Policy	script-src 'none'; object-src 'none'
X-Content-Type-Options	nosniff
X-Xss-Protection	0

Request headers

accept-language: de-DE,de;q=0.9
Referer: https://substack.com/
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.6099.129 Safari/537.36

Response headers

pragma: no-cache
date: Wed, 03 Jan 2024 16:24:29 GMT
content-security-policy: script-src 'none'; object-src 'none'
x-content-type-options: nosniff
server: cafe
content-type: image/gif
p3p: policyref="https://www.googleadservices.com/pagead/p3p.xml", CP="NOI DEV PSA PSD IVA IVD OTP OUR OTR IND OTC"
cache-control: no-cache, no-store, must-revalidate
cross-origin-resource-policy: cross-origin
timing-allow-origin: *
alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
content-length: 42
x-xss-protection: 0
expires: Fri, 01 Jan 1990 00:00:00 GMT

GET
H2 200 /
www.google.de/pagead/1p-user-list/316245675/ Frame FE0D 42 B
108 B 19ms
18ms Image
image/gif 2a00:1450:4001:80b::2003
GOOGLE

General

Check archive.org

Show headers Download Go to Show image

Full URL

https://www.google.de/pagead/1p-user-list/316245675/?random=1704299069188&cv=11&fst=1704297600000&bg=ffffff&guid=ON&async=1&gtm=45be3bt0v887153041&u_w=1600&u_h=1200&url=https%3A%2F%2Fsubstack.com%2Fchannel-frame&ref=https%3A%2F%2Fnewsletter.systemdesign.one%2F&frm=2&data=event%3Dgtag.config&fmt=3&is_vtc=1&cid=CAQSKQAvHhf_15Vv2vyLmwnw9NedMPon4umLSvPt72Faax4CUEIRQy-ZPz1e&random=3561578033&rmt_tld=1&ipr=y

Protocol

Security

TLS 1.3, , AES_128_GCM

Server

2a00:1450:4001:80b::2003 Frankfurt am Main, Germany, ASN15169 (GOOGLE, US),

Reverse DNS

Software

cafe /

Resource Hash

ef1955ae757c8b966c83248350331bd3a30f658ced11f387f8ebf05ab3368629

Security Headers

Name	Value
Content-Security-Policy	script-src 'none'; object-src 'none'
X-Content-Type-Options	nosniff
X-Xss-Protection	0

Request headers

accept-language: de-DE,de;q=0.9
Referer: https://substack.com/
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.6099.129 Safari/537.36

Response headers

pragma: no-cache
date: Wed, 03 Jan 2024 16:24:29 GMT
content-security-policy: script-src 'none'; object-src 'none'
x-content-type-options: nosniff
server: cafe
content-type: image/gif
p3p: policyref="https://www.googleadservices.com/pagead/p3p.xml", CP="NOI DEV PSA PSD IVA IVD OTP OUR OTR IND OTC"
cache-control: no-cache, no-store, must-revalidate
cross-origin-resource-policy: cross-origin
timing-allow-origin: *
alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
content-length: 42
x-xss-protection: 0
expires: Fri, 01 Jan 1990 00:00:00 GMT

Verdicts & Comments Add Verdict or Comment

25 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.

14 Cookies

Cookies are little pieces of information stored in the browser of a user. Whenever a user visits the site again, he will also send his cookie values, thus allowing the website to re-identify him even if he changed locations. This is how permanent logins work.

Domain/Path	Expires	Name / Value
.newsletter.systemdesign.one/	1970-01-21 02:10:35	Name: ab_testing_id Value: %22d029b5d6-6dd3-4b7f-a41b-abc4692b98c7%22
.newsletter.systemdesign.one/	1970-01-20 17:25:00	Name: __cf_bm Value: 1EwHfAIK6XY3LBiRj0zUVfyEiltflxeIrTlOJ4JNmw0-1704299067-1-Aa9aSqa7E271abQT3tGYQuqkpTY0kshKBtQEo0yu+9tvnT/Q5YtpkfRj7+qtwDU6PbbeMWmTWDfcuY8BELhQ/+g=
.systemdesign.one/	1970-01-21 03:00:59	Name: _ga_99PY3XXQY0 Value: GS1.1.1704299068.1.0.1704299068.0.0.0
.systemdesign.one/	1970-01-21 03:00:59	Name: _ga Value: GA1.1.77275913.1704299068
newsletter.systemdesign.one/	1970-01-21 02:10:35	Name: ajs_anonymous_id Value: %228c9c3cad-a133-49f4-af8f-4284c814b0ae%22
.substack.com/	1970-01-20 17:25:00	Name: __cf_bm Value: vOwQfKt7XOBECL9JZHauHbV2q2GkHVJ16aRYaDii3mE-1704299068-1-AQbjuReF6Nj6qsxMN1TD7H/J5nOifY3pp8WH0HK9aN7uLEK2RGyHXevzOfbQUDQ7ZpzQJ8Ka2Ft2MJa2DfZk7G4=
.newsletter.systemdesign.one/	1970-01-21 02:10:35	Name: ajs_anonymous_id Value: %228c9c3cad-a133-49f4-af8f-4284c814b0ae%22
newsletter.systemdesign.one/	1970-01-20 17:35:03	Name: AWSALBTG Value: IGsSMXwgkV1enwC3oBJkqPz9abrlLhL3/KiF51o8S/yip3Ogy56MFLkl/R5LI/mbZrahWTeLSH/TM2781VEeq7z4or4agYXXgj8IVSMGC8sYp94tz6DewBYr2fl/8jZbhIYYkrhgsjfQ3KUmXORPKHmGmAdCo+HvZAomUvsYmdHf
newsletter.systemdesign.one/	1970-01-20 17:35:03	Name: AWSALBTGCORS Value: IGsSMXwgkV1enwC3oBJkqPz9abrlLhL3/KiF51o8S/yip3Ogy56MFLkl/R5LI/mbZrahWTeLSH/TM2781VEeq7z4or4agYXXgj8IVSMGC8sYp94tz6DewBYr2fl/8jZbhIYYkrhgsjfQ3KUmXORPKHmGmAdCo+HvZAomUvsYmdHf
.newsletter.systemdesign.one/	1970-01-20 17:25:00	Name: visit_id Value: %7B%22id%22%3A%2292535eb4-6c6b-42a6-b660-d3447c5b2d61%22%2C%22timestamp%22%3A%222024-01-03T16%3A24%3A28.358Z%22%7D
substack.com/	1970-01-20 17:35:03	Name: AWSALBTGCORS Value: I0hwCc/4Cf5uMc6GVFFxd8jD9rChL6tDyAxjwSjvYnfHHRrM+gnv0BKsd96qTfJoqq3tozoXcaDg7+U7BY7CppM2gCDjA/ufZVplQ0/kO8QQNYnnHGJlm7fikJQJvE7ZLy6kR+QCnrDBoWWTBeH0TwhSt3d0O1Wpt95r/ql/NVzs
.systemdesign.one/	1970-01-20 19:34:35	Name: _gcl_au Value: 1.1.807751497.1704299069
.doubleclick.net/	1970-01-21 02:46:35	Name: IDE Value: AHWqTUmqkDdLW0DVh-IbZrMwALobNyQKsg3zW4Sf-tp661L4WacC9uoDL-rrb27W
newsletter.systemdesign.one/	1970-01-20 17:24:59	Name: _dd_s Value: rum=0&expire=1704299967625

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
Strict-Transport-Security	max-age=31536000
X-Frame-Options	sameorigin

Indicators

This is a term in the security industry to describe indicators such as IPs, Domains, Hashes, etc. This does not imply that any of these indicate malicious activity.

cloudflareinsights.com
googleads.g.doubleclick.net
js.sentry-cdn.com
newsletter.systemdesign.one
region1.google-analytics.com
static.cloudflareinsights.com
substack.com
substackcdn.com
www.datadoghq-browser-agent.com
www.google.com
www.google.de
www.googletagmanager.com
13.224.93.118
2001:4860:4802:34::36
2600:9000:21c7:8200:4:b4b9:d3c0:93a1
2606:4700:4400::6812:21f5
2606:4700:4400::6812:2857
2606:4700::6810:3865
2a00:1450:4001:80b::2003
2a00:1450:4001:811::2002
2a00:1450:4001:813::2004
2a00:1450:4001:830::2008
2a04:4e42::729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newsletter.systemdesign.one Open in urlscan Pro 2606:4700:4400::6812:2857 Public Scan

Summary

urlscan.io Verdict: No classification

Domain & IP information

Screenshot Live screenshot Full Image

Page Title

Page URL History Show full URLs

Detected technologies

Page Statistics

62 Requests

100 %HTTPS

91 %IPv6

11 Domains

12 Subdomains

11 IPs

2 Countries

2394 kBTransfer

6478 kBSize

14 Cookies

28 Outgoing links

Page URL History

Redirected requests

62 HTTP transactions Everything HTML Script AJAX CSS Image Expand all 0 data transactions

Request headers

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Response headers

newsletter.systemdesign.one Open in urlscan Pro
2606:4700:4400::6812:2857 Public Scan

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62
Requests

100 %
HTTPS

91 %
IPv6

11
Domains

12
Subdomains

11
IPs

2
Countries

2394 kB
Transfer

6478 kB
Size

14
Cookies

62 HTTP transactions
0 data transactions