HAProxy Health Check

https://www.haproxy.com/documentation/aloha/7-0/haproxy/healthchecks/#checking-a-http-service

Squid - caching HTTP, HTTPS, FTP, and more

http://www.squid-cache.org

Debugging

https://mitmproxy.org/
allows traffic flows to be intercepted, inspected, modified and replayed.

SNI

Server Name Indication (SNI) is an extension to the TLS
allows a server to present multiple certificates on the same IP address and TCP port number
Wiki: https://en.wikipedia.org/wiki/Server_Name_Indication

Varnish

https://hub.docker.com/r/centos/varnish-4-centos7/
https://access.redhat.com/containers/?tab=overview#/search/varnish

Cloudflare

CNAME Flattening

https://blog.cloudflare.com/introducing-cname-flattening-rfc-compliant-cnames-at-a-domains-root/

For example, CNAME 6equj5.wordplumblr.com for Foo.com. when Foo.com started using too many resources WordPlumblr could have updated the CNAME and isolated Foo.com from the rest of the customers.

the biggest edge case had to do with email sent from Microsoft Exchange mail servers.

"flattens" the CNAME chain, a way to support a CNAME at the root, but still follow the RFC and return an IP address for any query for the root record.

Real IP

https://support.cloudflare.com/hc/en-us/articles/200170986

https://support.cloudflare.com/hc/en-us/articles/200170706-How-do-I-restore-original-visitor-IP-with-Nginx-

Github pages

*.github.io: force https
custom domain: https ERR_CERT_COMMON_NAME_INVALID

https://help.github.com/articles/setting-up-an-apex-domain/

192.30.252.153
192.30.252.154

Google Analytics

https://analytics.google.com/analytics/web/#/.../admin/property/settings

all links for which you want enhanced click attribution should have an ID attribute

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