Cargo is package manager for Rust's and its build system. Cargo is used to search for, install, and manage packages that you want to use and build them. Cargo is also the test runner, and the documentation generator.

Rust is a systems programming language pursuing the trifecta: safety, which is guaranteed at compile time; fearless concurrency, which is a lot easier when things are safe; and blazingly fast speed due to zero-cost abstractions and other nice things.

cURL Timeout controls for how many seconds or milliseconds a connection should be made available for transfer or data.

This code snippet will get the size of the remote file without actually downloading it. It is important to remember that file size is present in the content-length field of the HTTP response header.

The HTTP 401 Unauthorized response status code indicates that the client request has not been completed because it lacks valid authentication credentials for the requested resource. In order to access the resource client must provide a credential to access it.