Function actix_web_security::authentication::scheme::header_extractor::extract_auth_header

pub fn extract_auth_header(
    header: &HeaderValue, 
    auth_scheme: &str, 
    header_length: usize
) -> Result<String, AuthenticationError>

Utility function to extract the actual token from the header for a given authentication scheme (basic/bearer). Returns either a String with the extracted token (without the scheme prefix from the header) or an AuthenticationError.