Function async_google_apis_common::do_request_with_headers

pub async fn do_request_with_headers<Req: Serialize + Debug, Resp: DeserializeOwned + Clone + Default>(
    cl: &TlsClient,
    path: &str,
    headers: &[(HeaderName, String)],
    http_method: &str,
    rq: Option<Req>
) -> Result<(Resp, HeaderMap)>

The Content-Type header is set automatically to application/json. Also returns response headers.