How do I manage certificates and SSL errors in headless_chrome (Rust)?

Managing SSL certificates and dealing with SSL errors in headless Chrome when using Rust typically involves configuring Chrome options within your web scraping or automation code. If you're using the rust-headless-chrome crate or any similar library in Rust, you will need to set up Chrome with the appropriate arguments to either ignore SSL errors or to provide a custom certificate.

Here's an example of how you could configure your headless Chrome browser to ignore SSL errors when you're using a library that provides bindings to the Chrome DevTools Protocol, such as fantoccini:

use fantoccini::{client, ClientBuilder};

#[tokio::main]
async fn main() -> Result<(), fantoccini::error::NewSessionError> {
    // Configure Chrome to ignore SSL errors
    let capabilities = serde_json::json!({
        "goog:chromeOptions": {
            "args": ["--headless", "--disable-gpu", "--ignore-certificate-errors"],
        }
    });

    // Create a new client instance with the specified capabilities
    let client = ClientBuilder::native()
        .capabilities(capabilities)
        .connect("http://localhost:9515")
        .await?;

    // Use the `client` to interact with the headless Chrome instance

    // Remember to properly close the client session
    client.close().await
}

In this example, we're using the --ignore-certificate-errors flag to tell Chrome to bypass SSL errors. This can be useful for development or testing purposes, but be aware that ignoring SSL errors in production is a security risk and is typically not recommended.

If instead, you want to provide a custom certificate to Chrome, you can do so using the --ignore-certificate-errors-spki-list flag, which allows you to specify the public key hashes of the certificates you want to trust explicitly. However, this approach requires you to compute the SPKI fingerprints of the certificates, which can be a bit involved.

Here’s how you could configure your client to use a custom certificate:

let capabilities = serde_json::json!({
    "goog:chromeOptions": {
        "args": ["--headless", "--disable-gpu", "--ignore-certificate-errors-spki-list=<your-certificate-spki-hash>"],
    }
});

Replace <your-certificate-spki-hash> with the actual SPKI hash of your custom certificate.

Keep in mind that the specific commands and configuration options might differ depending on the Rust library you're using to control headless Chrome. Always refer to the documentation of the library you're using to ensure you're using the correct syntax and options.