Function async_google_apis_common::do_upload_multipart

pub async fn do_upload_multipart<Req: Serialize + Debug, Resp: DeserializeOwned + Clone, '_, '_, '_, '_>(
    cl: &'_ TlsClient, 
    path: &'_ str, 
    headers: &'_ [(HeaderName, String)], 
    http_method: &'_ str, 
    req: Option<Req>, 
    data: Bytes
) -> Result<Resp>

The Content-Length header is set automatically.