I have a situation where I want to read some headers via reqwest::header::HeaderValue

I am doing so using

#[tokio::main]
async fn main() -> Result<(), reqwest::Error> {
    let url = "https://httpbin.org/get";
    let resp = reqwest::Client::new().get(url).send().await?;

    // read response headers
    // default if the header does not exist
    let resp_headers: &str = resp
        .headers()
        .get("content-length")
        .unwrap_or(&reqwest::header::HeaderValue::from_str("100").unwrap())
        .to_str()
        .unwrap_or("100");
    println!("{}", resp_headers);

    Ok(())
}

This doesn’t seem idiomatic and won’t compile. Looking for how to approach a scenario like this where there are several necessary unwraps to process and cast a type into desired end result.