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  2. MIDRANGE-L
  3. May 2019

Re: Why adulterate ports vs using an additional IP address? Was: Ports IP specific?

Some shops front-end their web servers with one that is configured as a
"reverse proxy", which is listening on ports 80 and 443, which then
reroutes requests based on a name prefix, so that:

x1.mycompany.com routes to say port 9001,
x2.mycompany.com routes to say port 9002,
x3.mycompany.com routes to say port 9003,

etc.

They may lease only one public IP address from their ISP, and pay for only
one wildcard certificate, and still be able to support many independent web
sites. Web hosting providers may do this. Encryption is only configured on
the reverse-proxy instance, as opposed to configuring encryption on many
web servers.

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