redirect_with_cookie.rs

use reqwest::{redirect::Policy, Client};

#[derive(Debug, thiserror::Error)]
enum Error {
    #[error("reqwest error: {0:?}")]
    Network(#[from] reqwest::Error),
}

#[tokio::main]
async fn main() -> Result<(), Error> {
    let url = "https://httpbin.org/cookies/set/key/value".to_string();
    let client = Client::builder()
        .cookie_store(true)
        .redirect(Policy::none())
        .build()?;

    let resp = client.get(url.as_str()).send().await?;

    for cookie in resp.cookies() {
        println!("cookie: {:?}", cookie); // <- is cookie
    }
    let cookie = resp.headers().get(reqwest::header::SET_COOKIE);
    println!("cookie (header): {:?}", cookie); // <- Some(_)

    let next_req = client.get(url.as_str()).build()?;
    let cookie = next_req.headers().get(reqwest::header::COOKIE);
    println!("cookie (header (2)): {:?}", cookie); // <- None

    Ok(())
}