Add certificate and key in Rust API request

rust_api_certificate.rs

//https://www.reddit.com/r/learnrust/comments/y5qm0y/certificates_in_reqwest_crate/
let mut headers = HeaderMap::new();
headers.insert(ACCEPT, "application/json".parse().unwrap());
headers.insert("X-Application", "someKey".parse().unwrap());
                                                                     
// Format body
let login_params = [("username", "myusername"), ("password", "password")];
                                                                     
// create a certificate identity
let mut buf = Vec::new();
File::open("client-2048.crt")?.read_to_end(&mut buf)?;
File::open("client-2048.key")?.read_to_end(&mut buf)?;
let id = reqwest::Identity::from_pem(&buf)?;
                                                                     
let client = reqwest::Client::builder()
    .use_rustls_tls()
    .identity(id)
    .build()?;
let res = client
    .post("https://someurl.com/api/certlogin")
    .headers(headers)
    .form(&login_params)
    .send()
    .await?
    .json::<serde_json::Value>()
    .await?;

https://docs.rs/reqwest/latest/reqwest/tls/struct.Certificate.html

https://stackoverflow.com/questions/44059266/how-to-make-a-request-with-client-certificate-in-rust