How to send proper HTTP request and handle the response?

Question

I have written a function to send a POST request:

pub async fn make_login_request(
    client: &Client,
    host: &String,
    credentials: &HashMap<String, String>,
) -> Result<(), reqwest::Error> {
    client
        .post(
            &(String::from("https://")
                + &String::from(host)
                + &String::from("/[URL]")),
        )
        .json(&credentials)
        .header(
            CONTENT_TYPE,
            "application/json, text/javascript, */*; q=0.01",
        )
        .send()
        .await?;
    Ok(())
}

Now I have to validate the response. If the connection is lost, I need to break and exit the program. If it's another error code like 401, I need to exit as well, otherwise show success when 200.

How can I handle all these scenarios when I call make_login_request? If I call it like

make_login_request(&client, &host, &credentials)

how can I throw error with details in case of any error or return/print success?