Function make_http_request_reserved 

pub async fn make_http_request_reserved<B: Serialize>(
    client: &Client,
    rate_limiter: &RateLimiter,
    method: Method,
    url: &str,
    headers: Vec<(&str, &str)>,
    body: &Option<B>,
    retry_config: RetryConfig,
    reserved: bool,
) -> Result<Response, AppError>

Same as make_http_request, but told whether the first send already owns a token.

reserved = true means the caller took a cell from rate_limiter for this request and the first attempt must not take another. Retries always pace themselves: each one is a fresh request as far as IG is concerned.