Function jws::get_required_header_param

pub fn get_required_header_param<'a>(
    protected: Option<&'a JsonObject>, 
    unprotected: Option<&'a JsonObject>, 
    key: &str
) -> Result<&'a JsonValue>

Get a required parameter from either header.

This is almost identical to get, except that this function returns a properly formatter error instead of an empty optional.