You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: custom-headers.rs
    path of file: ./repos/aws-sdk-rust/sdk/glacier/tests
    
    the code of the file until where you have to start completion: /*
 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 */

use aws_sdk_glacier::config::{Credentials, Region};
use aws_sdk_glacier::primitives::ByteStream;
use aws_smithy_protocol
    
async fn autofill_account_id() {
    let (http_client, handler) = capture_request(None);
    let conf = aws_sdk_glacier::Config::builder()
        .region(Region::new("us-east-1"))
        .credentials_provider(Credentials::for_tests())
        .http_client(http_client)
        .build();

    let client = aws_sdk_glacier::Client::from_conf(conf);
    let _resp = client
        .abort_multipart_upload()
        .vault_name("vault")
        .upload_id("some/upload/id")
        .send()
        .await;
    let req = handler.expect_request();
    assert_eq!(
        "https://glacier.us-east-1.amazonaws.com/-/vaults/vault/multipart-uploads/some%2Fupload%2Fid",
        req.uri()
    );
}