External monitor cuts out on MacBook with Multiport Adapter

If you are referring to GNU sort, it implements a variant of the merge sort algorithm.

The coreutils are open source, so feel free to download them and take a look.

The relevant POSIX standard doesn't dictate what algorithm to use, so implementations are free to choose what they like.

You cannot explicitly set any HTTP headers in a HTML form apart from choosing the Content-Type between two predefined values. This means you also cannot set some x-forwarded-host header.