openai/codex · error · anyhow::Error

unable to determine callback address

Error message

unable to determine callback address

What it means

Error "unable to determine callback address" thrown in openai/codex.

Source

Thrown at codex-rs/rmcp-client/src/perform_oauth_login.rs:438

    }

    Ok(None)
}

fn local_redirect_uri(server: &Server) -> Result<String> {
    match server.server_addr() {
        tiny_http::ListenAddr::IP(std::net::SocketAddr::V4(addr)) => {
            let ip = addr.ip();
            let port = addr.port();
            Ok(format!("http://{ip}:{port}/callback"))
        }
        tiny_http::ListenAddr::IP(std::net::SocketAddr::V6(addr)) => {
            let ip = addr.ip();
            let port = addr.port();
            Ok(format!("http://[{ip}]:{port}/callback"))
        }
        #[cfg(not(target_os = "windows"))]
        _ => Err(anyhow!("unable to determine callback address")),
    }
}

fn resolve_redirect_uri(server: &Server, callback_url: Option<&str>) -> Result<String> {
    let Some(callback_url) = callback_url else {
        return local_redirect_uri(server);
    };
    Url::parse(callback_url)
        .with_context(|| format!("invalid MCP OAuth callback URL `{callback_url}`"))?;
    Ok(callback_url.to_string())
}

fn callback_id_from_server_url(server_url: &str) -> Result<String> {
    // Native Codex callback IDs intentionally hash the complete MCP URL (minus its fragment)
    // with SHA-256. Python connector callback IDs use SHAKE-256 over the origin and are distinct.
    let mut parsed =
        Url::parse(server_url).with_context(|| format!("invalid MCP server URL `{server_url}`"))?;
    parsed

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/rmcp-client/src/perform_oauth_login.rs:438 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of openai/codex@339751715c (2026-08-25). Data as JSON: /api/errors/51bdf5ca4ce692c2. Report an issue: GitHub.