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: s3.rs
    path of file: ./repos/rusoto/integration_tests/tests
    
    the code of the file until where you have to start completion: #![cfg(feature = "s3")]
use std::collections::HashMap;
use std::env;
use std::fs::File;
use std::io::Read;
use std::str;
use std::time::Duration;

use bytes::Bytes;
use rand::distributions::Alphanumeric;
use rand::R
    
    async fn create_anonymous_client(&self) -> S3Client {
        if cfg!(feature = "disable_minio_unsupported") {
            // Minio does not support setting acls, so to make tests pass, return a client that has
            // the credentials of the bucket owner.
            self.s3.clone()
        } else {
            S3Client::new_with(
                rusoto_core::request::HttpClient::new().expect("Failed to creat HTTP client"),
                StaticProvider::from(AwsCredentials::default()),
                self.region.clone(),
            )
        }
    }