I'm using VisualSVN Server that installs an Apache server.

Within the below example

    <Location /MyIISWebSite>
      ProxyPass https://my-domain.com:8443/MyIISWebSite
      ProxyPassReverse https://my-domain.com:8443/MyIISWebSite
    </Location> 

how do you result in the

    <Location /MyIISWebSite >

to become situation insensitive to be able to match all combinations (like myiiswebsite, MYIISWEBSITE, ...) ?

Use LocationMatch having a situation-insensitive regex modifier, like so:

<LocationMatch "(?i)/MyIISWebSite">
...
</LocationMatch>