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: config.rs
    path of file: ./repos/aws-sdk-rust/sdk/drs/src
    
    the code of the file until where you have to start completion: // Code generated by software.amazon.smithy.rust.codegen.smithy-rs. DO NOT EDIT.

/// Configuration for a aws_sdk_drs service client.
///
///
/// Service configuration allows for customization of endpoints, region, credentials providers,
/// and retry configuration. Generally, it is constructed automatically for you from a shared
/// configuration loaded by the `aws-config` crate. For example:
///
/// ```ignore
/// // Load a shared config from the environment
/// let shared_config = aws_config::from_env().load().await;
/// // The client constructor automatically converts the shared config into the service config
/// let client = Client::new(&shared_config);
/// ```
///
/// The service config can also be constructed manually using its builder.
///
#[derive(::std::clone::Clone, ::std::fmt::Debug)]
pub struct Config {
    // Both `config` and `cloneable` are the same config, but the cloneable one
    // is kept around so that it is possible to convert back into a builder. This can be
    // optimized in the future.
    pub(crate) config: crate::config::FrozenLayer,
    cloneable: ::aws_smithy_types::config_bag::CloneableLayer,
    pub(crate) runtime_components: crate::config::RuntimeComponentsBuilder,
    pub(crate) runtime_plugins: ::std::vec::Vec<crate::config::SharedRuntimePlugin>,
    behavior_version: ::std::option::Option<crate::config::BehaviorVersion>,
}
impl Config {
    /// Constructs a config builder.
    pub fn builder() -> Builder {
        Builder::default()
    }
    /// Converts this config back into a builder so that it can be tweaked.
    pub fn to_builder(&self) -> Builder {
        Builder {
            config: self.cloneable.clone(),
            runtime_components: self.runtime_components.clone(),
            runtime_plugins: self.runtime_plugins.clone(),
            behavior_version: self.behavior_version.clone(),
        }
    }
    /// Return a reference to the stalled stream protection configuration contained in this config, if any.
    pub fn stalled_stream_protection(&self) -> ::std::option::Option<&crate::config::StalledStreamProtectionConfig> {
        self.config.load::<crate::config::StalledStreamProtectionConfig>()
    }
    /// Return the [`SharedHttpClient`](crate::config::SharedHttpClient) to use when making requests, if any.
    pub fn http_client(&self) -> Option<crate::config::SharedHttpClient> {
        self.runtime_components.http_client()
    }
    /// Returns the endpoint resolver.
    pub fn endpoint_resolver(&self) -> ::aws_smithy_runtime_api::client::endpoint::SharedEndpointResolver {
        self.runtime_components.endpoint_resolver().expect("resolver defaulted if not set")
    }
    /// Return a reference to the retry configuration contained in this config, if any.
    pub fn retry_config(&self) -> ::std::option::Option<&::aws_smithy_types::retry::RetryConfig> {
        self.config.load::<::aws_smithy_types::retry::RetryConfig>()
    }

    /// Return a cloned shared async sleep implementation from this config, if any.
    pub fn sleep_impl(&self) -> ::std::option::Option<crate::config::SharedAsyncSleep> {
        self.runtime_components.sleep_impl()
    }

    /// Return a reference to the timeout configuration contained in this config, if any.
    pub fn timeout_config(&self
    
    /// # fn example() {
    /// use aws_smithy_runtime_api::client::interceptors::context::InterceptorContext;
    /// use aws_smithy_runtime_api::client::orchestrator::OrchestratorError;
    /// use aws_smithy_runtime_api::client::retries::classifiers::{
    ///     ClassifyRetry, RetryAction, RetryClassifierPriority,
    /// };
    /// use aws_smithy_types::error::metadata::ProvideErrorMetadata;
    /// use aws_smithy_types::retry::ErrorKind;
    /// use std::error::Error as StdError;
    /// use std::marker::PhantomData;
    /// use aws_sdk_drs::config::{Builder, Config};
    /// # struct SomeOperationError {}
    ///
    /// const RETRYABLE_ERROR_CODES: &[&str] = [
    ///     // List error codes to be retried here...
    /// ];
    /// fn set_example_error_code_classifier(builder: &mut Builder) {
    ///     // When classifying at an operation's error type, classifiers require a generic parameter.
    ///     // When classifying the HTTP response alone, no generic is needed.
    ///     #[derive(Debug, Default)]
    ///     pub struct ExampleErrorCodeClassifier<E> {
    ///         _inner: PhantomData<E>,
    ///     }
    ///
    ///     impl<E> ExampleErrorCodeClassifier<E> {
    ///         pub fn new() -> Self {
    ///             Self {
    ///                 _inner: PhantomData,
    ///             }
    ///         }
    ///     }
    ///
    ///     impl<E> ClassifyRetry for ExampleErrorCodeClassifier<E>
    ///     where
    ///         // Adding a trait bound for ProvideErrorMetadata allows us to inspect the error code.
    ///         E: StdError + ProvideErrorMetadata + Send + Sync + 'static,
    ///     {
    ///         fn classify_retry(&self, ctx: &InterceptorContext) -> RetryAction {
    ///             // Check for a result
    ///             let output_or_error = ctx.output_or_error();
    ///             // Check for an error
    ///             let error = match output_or_error {
    ///                 Some(Ok(_)) | None => return RetryAction::NoActionIndicated,
    ///                   Some(Err(err)) => err,
    ///             };
    ///
    ///             // Downcast the generic error and extract the code
    ///             let error_code = OrchestratorError::as_operation_error(error)
    ///                 .and_then(|err| err.downcast_ref::<E>())
    ///                 .and_then(|err| err.code());
    ///
    ///             // If this error's code is in our list, return an action that tells the RetryStrategy to retry this request.
    ///             if let Some(error_code) = error_code {
    ///                 if RETRYABLE_ERROR_CODES.contains(&error_code) {
    ///                     return RetryAction::transient_error();
    ///                 }
    ///             }
    ///
    ///             // Otherwise, return that no action is indicated i.e. that this classifier doesn't require a retry.
    ///             // Another classifier may still classify this response as retryable.
    ///             RetryAction::NoActionIndicated
    ///         }
    ///
    ///         fn name(&self) -> &'static str { "Example Error Code Classifier" }
    ///     }
    ///
    ///     builder.push_retry_classifier(ExampleErrorCodeClassifier::<SomeOperationError>::new())
    /// }
    ///
    /// let mut builder = Config::builder();
    /// set_example_error_code_classifier(&mut builder);
    /// let config = builder.build();
    /// # }
    /// # }