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[SauvageThomas]

Hi,

I'm having an issue to contact my local webserver. It works well in HTTP but fails in HTTPS with this error:

Some(hyper_util::client::legacy::Error(Connect, Os { code: -2146893018, kind: Uncategorized, message: "Le message reçu était inattendu ou formaté de façon incorrecte." }))

I am able to contact my HTTPS server with other tools (web browser, CURL, Bruno, ...) without any issue.

Here is my code:

fn main() {
    let client = Client::builder()
        .danger_accept_invalid_certs(true)
        .build()
        .unwrap();

    client.get("https://localhost:8443/hello").send().unwrap();
}

The webserver is a TLS Axum with self signed certs with mkcert.

I've also tried to add the root cert but the error stays the same:

fn main() {
    let pem = std::fs::read("C:\\Users\\[USER]\\AppData\\Local\\mkcert\\rootCA.pem").unwrap();
    let cert = reqwest::Certificate::from_pem(&pem).unwrap();

    let client = Client::builder()
        .add_root_certificate(cert)
        .danger_accept_invalid_certs(true)
        .build()
        .unwrap();

    client.get("https://localhost:8443/hello").send().unwrap();
}

Do you have any idea about the cause of this problem ?

[seanmonstar]

Have you tried looking up the error code? That number combined with "windows error" should likely bring up some solutions in search results.

[SauvageThomas]

@seanmonstar I didn't find any conclusive thing for this error on Windows. If I understand correctly it's a problem with the TLS handshake between the client/server.
Knowing this, I looked at the features flags for the Reqwest crate and I tried different settings.

• default-tls does not work
• native-tls does not work either
• rustls-tls works !

I can make it work with rustls feature and the use_rustls_tls() in ClientBuilder. I don't really know what rustls is doing behind the scenes for this behaviour to happen.

Thanks for the great library and have a good day !